UPDATED: I posted further research and a solution of sorts for that ‘left-channel buzz’ at the bottom of this review.
Introduction
This review covers the practical aspects of the Ragnarok that I’ve encountered in my two weeks with the amp, comments on casual listening with a variety of headphones and sources, and some critical listening I did against my HeadAmp GS-X mk2. This review will not cover all the technical inner workings of the Ragnarok. I have not opened this unit and you can find those details easily enough at Schiit.com. Although I hooked up speakers to verify functionality of the speaker outs, all listening for this review was done with headphones. I don’t have much experience with tube amps so I won’t make any comparisons there.
Disclaimers
I have no relation to Schiit Audio, was not in any beta test for the amp, and purchased all equipment used in the review myself.
This is a great amp but I’m not going to use any superlatives to describe it. I have no idea what words like ‘chocolatey’, ‘juicy’, ‘perfervid’ or ‘luscious’ have to do with amplification so I won’t use them. I also only vaguely get how a ‘macro-detail’ is supposed to differ from a ‘micro-detail’ so technical-sounding jiggery-pokery is also out. What’s left? Not a lot, so look for that somewhere else. It’s out there or will be shortly.
Gear \ Tracks Used
The Ragnarok was tested free standing on my desktop for heat measurements, then placed into my sturdy yet amazingly ugly test rack and provided with active cooling (silent fans). DACs used included a Questyle CAS192D, Schiit Gungnir Gen2 USB, a Mytek 192 Stereo DSD and a Modi. I threw a Technics SL-1200MK2 TT & pre-amp at the RCA inputs occasionally, otherwise all cabling was balanced (no-name from Markertek) running through an external balanced stepped attenuator. All full sized headphones (Senn HD 800 & 600, Alpha Dogs, TH900s, LCD-X, OPPO PM-1s) used balanced connections primarily, except the TH-900s (stock SE cables). All IEMs used were single ended. Everything was fed by a laptop running JRiver20. During amp-to-amp listening a passive splitter was used to send the signal to both amps.
Test tracks used are listed at the bottom of this review. I also listened to various other material over the last few weeks.
For reference I usually listen at low to moderate volumes (about 57 dB casual listening, maybe 67 dB rocking out). Preferred music genres are 70s rock & progressive, electronica, dubstep, female vocals. I have been listening to a GS-X mk2 or an Audio-gd Master 8 as my primary amps for a while.
Design \ Build Quality
The Ragnarok continues Schiit’s family of brushed metal U shaped enclosures, no surprise there. The front has more features than their other amps with input and gain selector buttons set in a darker gray insert which also houses LED indicators and both headphone jacks. The polished nickel knob is fingerprint central. It’s a not a bad look in the bigger form factor except for the SE headphone jack, which appears to be piece of threaded rod with a nut on it. Sticking out of the front of the box it seems a bit DIY and looks out of place on a product Schiit touts as their “ultimate” amplifier. Otherwise the unit feels like a step up from their normal ‘value’ positioned gears.
The Ragnarok’s foot print and weight put it squarely into racked speaker amp territory, but the lack of a power switch on the Ragnarok’s front asks you to run it from your desktop. The rocker-style power switch (located on the top-back of the box, new for Schiit I think) is more useful for the reach-around than the low-placed switches on their other units. Placing the Ragnarok into a rack requires you to have access around the back to flip it on and off, unless you hook up an alternate switch solution (easy enough) or are OK with leaving it on all the time.
Given the size and weight (16” x 12” and 32lbs) a rack solution is highly recommended if you want to stack gears. The main heat vents on the Rag are at the top of the unit and should have several inches of clearance from other objects (Amplifier 101 here), so no putting other gear directly on top of it. The Gungnir, a large-ish DAC, is 16” by 8” inches deep so stacking the Rag on it would be a bit precarious. Would be stackers, stop now and measure your own DAC. Yeah. Plan on a rack or perhaps some cones or lifters for placing other gear on top of the Ragnarok.
Function
The plentiful inputs and outputs are nice, and of course you get speaker outputs which is unique-ish for “headphone” amps. I would have loved memorized volume levels for each input but that’s not part of the design. There’s no indicator as to which output method is selected (speakers only \ Speakers + headphones \ headphones only). This makes it a little hard initially to choose your correct setting & troubleshoot issues (is the DAC not working or is this thing on the wrong output? Is JRiver set wrong or is it the amp output? etc.).
The gain button is hair-trigger, I was almost convinced it was a capacitive surface with how little pressure is needed to activate it. It occasionally cycles through 2 or even 3 gain settings before I can get my finger off it, and this behavior may be worse when the unit is warm. It requires a delicate and possibly more patient touch than mine.
The relay stepped volume control gives a precise channel balance at even the lowest levels, always nice, especially for IEMs. However it made it impossible to level to hit an exact desired volume level at times. This was only an issue when trying to level match against another amplifier and I don’t expect it to interfere with normal listening. Interestingly, stepping down the relay volume control doesn’t always seem to jibe with its pattern on the way up. If one click up raises the volume by 2dB, one click down might lower it by 1dB. This might be a limitation of my SPL meter, or possibly a function of the gain setting.
The clicking of the relays is concerning for a few minutes until you get used to it. The clicking over the headphones when near the top of the volume range is still a bit off putting. Per the user manual, the “muting” volume relay clicks are expected. OK. But with my 800s plugged in, balanced or unbalanced, I could reliably create distinct static pops over the cans when changing volume near the top of the range if the gain was set to High. So, don’t do that. This is NOT an issue with gain set to my preferred Low, so I don’t count it as a problem.
Not going to say too much about power except that the Ragnarok has it. Enough to power whatever headphones you throw at it and more. Low gain is all I needed to get into ear-bleed levels with all the balanced cans I listened to.
As expected for a speaker amp, the box does indeed get hot. After being on for a few hours on a desktop with volume at around 3 o’clock position it was uncomfortably hot grasping it from the sides in order to move it. The top and bottom were too hot to handle. I don’t consider the heat to be an issue but again don’t expect to stack anything directly on top of the amp. If this will be placed in a closed rack you will need an active cooling solution. In my test rack the fans can be easily removed and replaced which helps a lot with the awkward placement of the power switch here.
Sound
Full Sized Cans
Primarily I used HD800s to critically listen for everything I could think of then, I threw other cans into the mix to focus on specific areas (bass extension on the Fostex and Audeze, mid-range on the OPPOs) as well as to get an overall feel for handling of the various cans. Again, all full sized headphones are balanced except the TH-900s with stock SE cable. All IEMs were single ended.
On low gain the noise floor is excellent (except for an issue I ran into with IEMs on the SE jack, as explained below), and low gain is all I needed to get into ear-bleed levels with everything balanced I listened to. On medium gain the floor increases slightly but is certainly not objectionable for a TOTL amp. On high gain the noise floor rockets up into the stratosphere, so don’t do that with headphones. Overall noise floor is on par with the best amps I have listened to.
With balanced full-size headphones the Ragnarok handled everything I threw at it with confidence and plenty of control. Everything performed well and at a level I’m used to hearing from other high-end SS amplifiers. DACs and source gear performed predictably with no surprises or revelations. Extension is good at the bottom end, nothing is missing up top or in the middle. I warned you, a boring description but as far as I’m concerned boring is good here.
HD800s were handled admirably with no unexpected sharpness, shrillness or breakaways from control that sometimes occur with lesser amplifiers. Notice the word unexpected: Running the usual suspects of poorly mastered tracks and highly-compressed MP3s through the 800s makes them sound like… well, like an 800 playing poorly mastered tracks. The Ragnarok presents these cans as well as I have heard them (with perhaps one exception) but performs no miracles. Smooth, controlled sound, a very good match and with these cans.
LCD-X. The LCD-X’s low end is kept in check but is not reduced, with good control of what I feel is a sometimes smeary can in the lows and mids. The Ragnarok brings out the top end as well as I have heard it. Again no miracles but a solid performance.
Fostex TH-900. If I can get any guiltier than spending thousands of dollars behind my wife’s back on audio equipment, the TH-900s are my extra guilty pleasure. This can with the Ragnarok and Gungnir DAC is as much bass and right on the edge of control as I’ll ever need. The SE output on the Ragnarok will exist solely for this purpose.
Alpha Dogs. These don’t get listened to much. Nothing wrong with these cans, they are just outperformed in one way or another by other headphones I have. IMO they need something other than any of my solid state amps (including the Ragnarok) to really bring something special to them. Ragnarok handled them well, it just didn’t find anything new in there.
OPPO PM-1. Great performance with this can, the amp brings out the best I have heard of it in the SS realm.
HD600s. Always amazed when I put these cans back on after a while. I listened to this with the Gungnir, Questyle (balanced), Modi (unbalanced) & my turn table (through a crappy ARTcessories DJ PREII pre-amp). Loved the tone through this amp on every single source. As usual. The amp wrought out every bit of performance the cans & gear are capable of.
IEMs
Listening to IEMs was not as successful as full sized cans. IEMs require the gain to be set on low or medium (at High the noise floor rockets into the stratosphere). On Low gain you have plenty of volume dial action (the knob goes to about 12 o’clock position for my normal listening level) and at lowest position there is still enough signal to produce sound, it never truly mutes.
In every IEM I tried I got a slight buzz from the left channel of the SE output. This was worst with a pair of ancient Shure EC3s but was present with all four IEMs I tried (HiFiMan RE-400s, Samsung no-names, and a pair of Skull Candys some niece or nephew must have left here). It was almost un-noticeable with the HiFiMans; I don’t know if I would have heard it if it hadn’t been so apparent with the other IEMs, and I never heard it any full sized cans plugged into the SE output (TH900s, HD800s). It’s not present on the balanced output.
I won’t be using IEMs on this amp so I don’t mind much. And, apart from the buzz, the noise floor in the right channel is almost silent and would be completely suitable for IEMs (at least the ones I tried). I will be checking with Schiit to see if this is just my unit.
UPDATED: I posted further research and a solution of sorts for the ‘left-channel buzz’ at the bottom of this review.
DACs
The amp paired well with everything I attached to it (all balanced except the Modi and the turntable pre-amp). Favorites were the Gungnir and the Questyle (apodizing filter) but this isn’t a DAC review.
Comparison to the GS-X mk2
I’ve been listening to the HeadAmp GS-X mk2 for just under 3 months now as my primary amp. The GS-X mk2 is a fully balanced, pure class A, solid state JFET amplifier & pre-amp, a review of which can be found here. The GS-X reasonably can be considered among the top U.S. made amplifier choices for dynamic headphones today so comparisons to the Ragnarok are in order. Currently the GS-X price is about 1/3 more than that of the Ragnarok, but I consider equating price with value in audiophile gear a mistake.
Design \ Build Quality
A simple summing up of the GS-X mk2 look is “Oooh, shiny!" Its polished anodized aluminum faceplates are available in a variety of colors (special order required) and these things just stand out from other utilitarian amps at shows. It’s sexy as hell. While the Ragnarok is no ugly duckling (and I do think the Schiit U-shaped unibody looks even better at this size), on looks alone the GS-X is hard to beat.
Build quality is top notch on both amps. Switches on the GS-X are heavy duty and function well, everything is well spaced and labeled, and obviously no expense has been spared on materials and parts. I sometimes do worry about scratching the beautiful front plate on the amp when moving too fast with a headphone jack but that’s a welcome concern. Likewise, on the Ragnarok the chassis and back panel give the overall impression of quality. On the front only one function is not clearly labeled (switching from speakers only \ Speakers + headphones \ headphones only). Once you know that process (RTFM) everything else is exceptionally clear. My one nag: The extending threaded pipe on the SE jack. Out of place on this amp.
The single-box design of the Ragnarok makes it the better choice for a crowded desktop, especially if you are willing to stack other gear on top of it (see my notes above on the advisability of stacking with this amp). The GS-X’s two-box design (the PSU is housed separately) requires more desk space unless you stack, and stacking is definitely NOT advised with the GS-X. Placing PSU and the amplifier directly on top of one another produces a distinct unpleasant noise floor which in my case requires a vertical gap of at least 5 inches to remove. So although the Ragnarok is big by desktop amplifier standards it still requires less room than the GS-X for desktop placement. (Note that the GS-X boxes can be placed immediately next to each other without any noise issues).
If you plan to place the amplifier in a rack (including a desktop rack) the GS-X is the slightly better form factor, due to that rear power switch on the Ragnarok. The units are both much smaller than the Ragnarok making for easier rack placement and the long umbilical is clearly designed for this purpose.
Function
The GS-X offers 4 pin, 3 pin, and dual SE outputs for maximum compatibility, while the Ragnarok offers single 4 pin and SE outputs. Practically, a 4 pin adapter will even up this disparity. The Ragnarok’s two sets of balanced inputs is a welcome upgrade over the single balanced set on the GS-X and offers more functionality for people with larger \ more complicated rigs. The Ragnarok also offers one more set of RCA inputs than GS-X (3 versus 2) so you can likely get away without an external switch in a larger set up. The GS-X offers both loop-back and pre-amp balanced outputs, while the Ragnarok offers balanced outputs and, yes, speaker outs. Your choice on a ‘winner’ as far as outputs go will depend on your specific needs. But if you want those speaker outs the choice is clear, and on inputs the Ragnarok offers greater value as well.
A note on those speaker outputs: You only need them for speakers with this amp. Any headphones you may now be running with speaker taps can be run from the headphone jack (preferably the balanced jack), because Ragnarok is not limiting power out of these jacks. So for speaker taps guys, the Ragnarok has you covered.
Regarding heat: Both are full sized, class A amps for headphone use (Ragnarok can go to class A\B for speakers), both get hot, both need ventilation space or an active cooling solution if placed in a closed rack. Nuff said.
The Alpha pot volume control on my GS-X mk2 can be adjusted with more precision than the Ragnarok relay. When level matching between the two I was usually forced to adjust the GS-X’s volume to match wherever the Ragnarok landed, which was often a dB above or below my target. As mentioned above this is unlikely to have consequences in real-world listening to the Ragnarok. The down side of the GS-X’s Alpha potentiometer is a slight channel imbalance at the absolute lowest levels on the volume dial (and perhaps a theoretical channel imbalance at higher levels as well), so a stepped attenuator is arguably the better design choice than the pots for powerful amps used with IEMs. I don’t find that to be the case with the GS-X and IEMs however, it plays them beautifully on low gain without any imbalance. And I should note that the standard GS-X mk2 ships with a stepped DACT attenuator, just like the Ragnarok. My choice of the Alpha was an option.
Both amps offer Low, Medium, and High gain settings. The gain button on the Ragnarok is fussier than the GS-X switch, taking longer to change (relays) and requiring a bit more patience and a light touch to get it where you need it to be. In fact, that’s how I would sum up the entire control scheme of the Ragnarok. Very usable, just slightly more finicky than the simple toggle switches on the GS-X.
On both amps, Low and Medium offer exceptionally low noise floor levels. Being so low, noise floors on both amps are quite susceptible to noise in the equipment chain. I found the Ragnarok never to be completely silent on Low gain, but so much so that any noise was usually muffled by general ambient noise in my office. On Medium gain the noise floor was minutely higher and increased only slightly with volume. At High gain the inevitable happens. But you’ll never need High gain. On Low gain, the GS-X mk2 is silent. Dead silent. Increasing it all the way up on Low gain it doesn’t do much to effect that. But on Medium and High gain it becomes more susceptible to equipment noise than the Ragnarok. With either amp I can clearly hear what noise is being added to the system from individual pieces of gear, but the effect is worse on the GS-X mk2 at Medium or High gain.
To summarize on Gain: The GS-X mk2 has a lower (non-existent) noise floor on low gain, but the noise floor on the Ragnarok is so low as to be negligible compared to other equipment running in your listening space, even my ‘silent’ fans. The GS-X mk2 is more susceptible to noise from the gear chain (in my rig at least) when at the top end of volume on the Medium or High gain setting. But again, you’ll never do that.
Sound
I level matched each amp\headphone combination with pink noise to 70dB (for PCM files) or 80dB (for DSD files) before listening. Volume was than handled off-board the amps with a balanced stepped attenuator when doing A\B listening. DACs used for A\B listening were primarily the Mytek192 DSD DAC (slow filter) and a Schiit Gungnir USB2, both running balanced to the amps.
The GS-X mk2 is one of the best SS amps I have listened to so the Ragnarok had a big challenge to meet. It met the challenge but didn’t run away with the competition. Frankly, when comparing level matched cans and the same chain & DAC through both amps I was hard pressed to find differences. Both amps have a relatively silent sound floor on low gain, allowing me to clearly hear the noise floor of each track. Bass, mids and treble appear to be handled equally well and with no obvious gaps (see notes with individual cans below). Both amps have more than adequate power for all my headphones: Dynamics, Openness, and Imaging were directly comparable to my hearing. Attack and transients as well.
Full Sized Cans
HD800s. Occasionally (ok, over the course of a few hours one evening) I thought the treble region was minutely louder (maybe one or two dB) on the GS-X using the Mytek DAC (“Freewheel", “Ben's Farm in Vermont”). However listening again the next day, no treble bump. At no time did I perceive treble as out of control on the GS-X, just possibly more forward. Otherwise no apparent difference, cans exhibit same their same dynamics, openness, and imaging on both amps. At this time the verdict is: they sound the same.
TH-900s. Sounded the same on both amps, U shaped and wonderful. Performance was consistent with the DAC feeding it across both amps. That is: if the DAC emphasized the bass (Gungnir) it sounded that way on both amps. A flatter DAC (Mytek), flatter performance on both amps. Neither amp added coloration or could save that god-forsaken mid-range.
LCD-X, Alpha Dogs, OPPO PM-1, HD600 - No readily apparent differences in performance. I can’t write verbiage on performance differences when I hear none. Again, both amps made clear every piece of the equipment chain, especially the DACS, but the sound difference between the amps themselves seemed minute if existing.
IEMs
I am going to delay my comparison on IEMs against the GS-X until I can determine if the buzz is just my unit. I will say the GS-X is fully capable of playing IEMs although the volume range is small, maybe a 8th of the volume dial on low gain (a little more with DSD tracks). The Alpha pot does NOT affect channel balance even at that low volume, and the noise floor is effectively non-existent. My opinion, the GS-X is a good choice for IEMs if a little (ok a lot) overkill.
Summary
I fully expect in a comparison soon someone will use the phrase “beefier” to describe the Ragnarok compared to the GS-X. Just looking at the form factor begs you to. The Ragnarok has several ticks for it in the form factor camp but my use of a rack pretty much negates that. I think clear advantages for Ragnarok are the extra inputs (no external switch needed) and speaker outputs which are going to drive some speaker purchases. All that, the power ratings (again, I didn’t measure it and it was not needed for the listening I did), and the price point make it a very attractive purchase. As for sound: I couldn’t trust myself to tell the difference blindfolded, at least at the volume and with the materials I used to listen. Other people with better ears and equipment than mine, please chime in now and tell me where I’m mistaken.
Test Tracks Used
Update on the Ragnarok’s ‘left-channel buzz’
I stated above that I'm getting a buzz from the left channel of Ragnarok over IEMs. Researching the interwebs indicates that it's not just my unit. Some beta-testers have reported the same buzz: Left channel, volume of buzz doesn't change with adjustments to the amp’s volume or gain setting. While I heard the buzz only through the SE output when using IEMs, these reports indicated it occurred on both balanced and SE outputs with sensitive headphones.
A few people have suggested it's related to AC line noise and that the circlotron-style design of the Ragnarok might be sensitive to this issue. Technical analysis of power supplies & output stages or whatever is a bit beyond me so no comment there. Testing I can do though, so I hooked the amp up to a Tripplite SU750XL double-conversion UPS (perfect sine wave AC output at 120V AC +/-2% ) to test out the theory.
And the buzz went away. Well, not entirely away, but so much that people might look at you funny if you ask them if they hear it. So much that it really doesn't matter anymore after you turn the volume up to listening levels. I could not reliably hear it on anything except those ancient Shures, though on them I could still determine the right from left channels by the buzz alone.
My AC power is not especially noisy AFAIK and I have not experienced this problem on other audio equipment on the circuit, including both my GS-X mk2 and Audio-gd Master 8 amps. Given that other people have independently reported this and that it's occurred on both beta and production units of the Ragnarok, I’m gonna go with ‘It’s the amp, not just my crappy power’. People experiencing this issue should consider some good power conditioning (not just power isolation) to feed the amp.
For perspective on this entire issue, read my full review above. I don’t find this to be a deal breaker with any full sized cans, including my stock TH-900s.
Edited to re-spell the word "Chocolatey". How the heck are you supposed to spell "Chocolatey" anyways?
Edited to change the link for details on the GS-X mk2. The previous link showed specifications for the original GS-X.
Edited to add research and findings on 'left channel buzz'.
Introduction
This review covers the practical aspects of the Ragnarok that I’ve encountered in my two weeks with the amp, comments on casual listening with a variety of headphones and sources, and some critical listening I did against my HeadAmp GS-X mk2. This review will not cover all the technical inner workings of the Ragnarok. I have not opened this unit and you can find those details easily enough at Schiit.com. Although I hooked up speakers to verify functionality of the speaker outs, all listening for this review was done with headphones. I don’t have much experience with tube amps so I won’t make any comparisons there.
Disclaimers
I have no relation to Schiit Audio, was not in any beta test for the amp, and purchased all equipment used in the review myself.
This is a great amp but I’m not going to use any superlatives to describe it. I have no idea what words like ‘chocolatey’, ‘juicy’, ‘perfervid’ or ‘luscious’ have to do with amplification so I won’t use them. I also only vaguely get how a ‘macro-detail’ is supposed to differ from a ‘micro-detail’ so technical-sounding jiggery-pokery is also out. What’s left? Not a lot, so look for that somewhere else. It’s out there or will be shortly.
Gear \ Tracks Used
The Ragnarok was tested free standing on my desktop for heat measurements, then placed into my sturdy yet amazingly ugly test rack and provided with active cooling (silent fans). DACs used included a Questyle CAS192D, Schiit Gungnir Gen2 USB, a Mytek 192 Stereo DSD and a Modi. I threw a Technics SL-1200MK2 TT & pre-amp at the RCA inputs occasionally, otherwise all cabling was balanced (no-name from Markertek) running through an external balanced stepped attenuator. All full sized headphones (Senn HD 800 & 600, Alpha Dogs, TH900s, LCD-X, OPPO PM-1s) used balanced connections primarily, except the TH-900s (stock SE cables). All IEMs used were single ended. Everything was fed by a laptop running JRiver20. During amp-to-amp listening a passive splitter was used to send the signal to both amps.
Test tracks used are listed at the bottom of this review. I also listened to various other material over the last few weeks.
For reference I usually listen at low to moderate volumes (about 57 dB casual listening, maybe 67 dB rocking out). Preferred music genres are 70s rock & progressive, electronica, dubstep, female vocals. I have been listening to a GS-X mk2 or an Audio-gd Master 8 as my primary amps for a while.
Design \ Build Quality
The Ragnarok continues Schiit’s family of brushed metal U shaped enclosures, no surprise there. The front has more features than their other amps with input and gain selector buttons set in a darker gray insert which also houses LED indicators and both headphone jacks. The polished nickel knob is fingerprint central. It’s a not a bad look in the bigger form factor except for the SE headphone jack, which appears to be piece of threaded rod with a nut on it. Sticking out of the front of the box it seems a bit DIY and looks out of place on a product Schiit touts as their “ultimate” amplifier. Otherwise the unit feels like a step up from their normal ‘value’ positioned gears.
The Ragnarok’s foot print and weight put it squarely into racked speaker amp territory, but the lack of a power switch on the Ragnarok’s front asks you to run it from your desktop. The rocker-style power switch (located on the top-back of the box, new for Schiit I think) is more useful for the reach-around than the low-placed switches on their other units. Placing the Ragnarok into a rack requires you to have access around the back to flip it on and off, unless you hook up an alternate switch solution (easy enough) or are OK with leaving it on all the time.
Given the size and weight (16” x 12” and 32lbs) a rack solution is highly recommended if you want to stack gears. The main heat vents on the Rag are at the top of the unit and should have several inches of clearance from other objects (Amplifier 101 here), so no putting other gear directly on top of it. The Gungnir, a large-ish DAC, is 16” by 8” inches deep so stacking the Rag on it would be a bit precarious. Would be stackers, stop now and measure your own DAC. Yeah. Plan on a rack or perhaps some cones or lifters for placing other gear on top of the Ragnarok.
Function
The plentiful inputs and outputs are nice, and of course you get speaker outputs which is unique-ish for “headphone” amps. I would have loved memorized volume levels for each input but that’s not part of the design. There’s no indicator as to which output method is selected (speakers only \ Speakers + headphones \ headphones only). This makes it a little hard initially to choose your correct setting & troubleshoot issues (is the DAC not working or is this thing on the wrong output? Is JRiver set wrong or is it the amp output? etc.).
The gain button is hair-trigger, I was almost convinced it was a capacitive surface with how little pressure is needed to activate it. It occasionally cycles through 2 or even 3 gain settings before I can get my finger off it, and this behavior may be worse when the unit is warm. It requires a delicate and possibly more patient touch than mine.
The relay stepped volume control gives a precise channel balance at even the lowest levels, always nice, especially for IEMs. However it made it impossible to level to hit an exact desired volume level at times. This was only an issue when trying to level match against another amplifier and I don’t expect it to interfere with normal listening. Interestingly, stepping down the relay volume control doesn’t always seem to jibe with its pattern on the way up. If one click up raises the volume by 2dB, one click down might lower it by 1dB. This might be a limitation of my SPL meter, or possibly a function of the gain setting.
The clicking of the relays is concerning for a few minutes until you get used to it. The clicking over the headphones when near the top of the volume range is still a bit off putting. Per the user manual, the “muting” volume relay clicks are expected. OK. But with my 800s plugged in, balanced or unbalanced, I could reliably create distinct static pops over the cans when changing volume near the top of the range if the gain was set to High. So, don’t do that. This is NOT an issue with gain set to my preferred Low, so I don’t count it as a problem.
Not going to say too much about power except that the Ragnarok has it. Enough to power whatever headphones you throw at it and more. Low gain is all I needed to get into ear-bleed levels with all the balanced cans I listened to.
As expected for a speaker amp, the box does indeed get hot. After being on for a few hours on a desktop with volume at around 3 o’clock position it was uncomfortably hot grasping it from the sides in order to move it. The top and bottom were too hot to handle. I don’t consider the heat to be an issue but again don’t expect to stack anything directly on top of the amp. If this will be placed in a closed rack you will need an active cooling solution. In my test rack the fans can be easily removed and replaced which helps a lot with the awkward placement of the power switch here.
Sound
Full Sized Cans
Primarily I used HD800s to critically listen for everything I could think of then, I threw other cans into the mix to focus on specific areas (bass extension on the Fostex and Audeze, mid-range on the OPPOs) as well as to get an overall feel for handling of the various cans. Again, all full sized headphones are balanced except the TH-900s with stock SE cable. All IEMs were single ended.
On low gain the noise floor is excellent (except for an issue I ran into with IEMs on the SE jack, as explained below), and low gain is all I needed to get into ear-bleed levels with everything balanced I listened to. On medium gain the floor increases slightly but is certainly not objectionable for a TOTL amp. On high gain the noise floor rockets up into the stratosphere, so don’t do that with headphones. Overall noise floor is on par with the best amps I have listened to.
With balanced full-size headphones the Ragnarok handled everything I threw at it with confidence and plenty of control. Everything performed well and at a level I’m used to hearing from other high-end SS amplifiers. DACs and source gear performed predictably with no surprises or revelations. Extension is good at the bottom end, nothing is missing up top or in the middle. I warned you, a boring description but as far as I’m concerned boring is good here.
HD800s were handled admirably with no unexpected sharpness, shrillness or breakaways from control that sometimes occur with lesser amplifiers. Notice the word unexpected: Running the usual suspects of poorly mastered tracks and highly-compressed MP3s through the 800s makes them sound like… well, like an 800 playing poorly mastered tracks. The Ragnarok presents these cans as well as I have heard them (with perhaps one exception) but performs no miracles. Smooth, controlled sound, a very good match and with these cans.
LCD-X. The LCD-X’s low end is kept in check but is not reduced, with good control of what I feel is a sometimes smeary can in the lows and mids. The Ragnarok brings out the top end as well as I have heard it. Again no miracles but a solid performance.
Fostex TH-900. If I can get any guiltier than spending thousands of dollars behind my wife’s back on audio equipment, the TH-900s are my extra guilty pleasure. This can with the Ragnarok and Gungnir DAC is as much bass and right on the edge of control as I’ll ever need. The SE output on the Ragnarok will exist solely for this purpose.
Alpha Dogs. These don’t get listened to much. Nothing wrong with these cans, they are just outperformed in one way or another by other headphones I have. IMO they need something other than any of my solid state amps (including the Ragnarok) to really bring something special to them. Ragnarok handled them well, it just didn’t find anything new in there.
OPPO PM-1. Great performance with this can, the amp brings out the best I have heard of it in the SS realm.
HD600s. Always amazed when I put these cans back on after a while. I listened to this with the Gungnir, Questyle (balanced), Modi (unbalanced) & my turn table (through a crappy ARTcessories DJ PREII pre-amp). Loved the tone through this amp on every single source. As usual. The amp wrought out every bit of performance the cans & gear are capable of.
IEMs
Listening to IEMs was not as successful as full sized cans. IEMs require the gain to be set on low or medium (at High the noise floor rockets into the stratosphere). On Low gain you have plenty of volume dial action (the knob goes to about 12 o’clock position for my normal listening level) and at lowest position there is still enough signal to produce sound, it never truly mutes.
In every IEM I tried I got a slight buzz from the left channel of the SE output. This was worst with a pair of ancient Shure EC3s but was present with all four IEMs I tried (HiFiMan RE-400s, Samsung no-names, and a pair of Skull Candys some niece or nephew must have left here). It was almost un-noticeable with the HiFiMans; I don’t know if I would have heard it if it hadn’t been so apparent with the other IEMs, and I never heard it any full sized cans plugged into the SE output (TH900s, HD800s). It’s not present on the balanced output.
I won’t be using IEMs on this amp so I don’t mind much. And, apart from the buzz, the noise floor in the right channel is almost silent and would be completely suitable for IEMs (at least the ones I tried). I will be checking with Schiit to see if this is just my unit.
UPDATED: I posted further research and a solution of sorts for the ‘left-channel buzz’ at the bottom of this review.
DACs
The amp paired well with everything I attached to it (all balanced except the Modi and the turntable pre-amp). Favorites were the Gungnir and the Questyle (apodizing filter) but this isn’t a DAC review.
Comparison to the GS-X mk2
I’ve been listening to the HeadAmp GS-X mk2 for just under 3 months now as my primary amp. The GS-X mk2 is a fully balanced, pure class A, solid state JFET amplifier & pre-amp, a review of which can be found here. The GS-X reasonably can be considered among the top U.S. made amplifier choices for dynamic headphones today so comparisons to the Ragnarok are in order. Currently the GS-X price is about 1/3 more than that of the Ragnarok, but I consider equating price with value in audiophile gear a mistake.
Design \ Build Quality
A simple summing up of the GS-X mk2 look is “Oooh, shiny!" Its polished anodized aluminum faceplates are available in a variety of colors (special order required) and these things just stand out from other utilitarian amps at shows. It’s sexy as hell. While the Ragnarok is no ugly duckling (and I do think the Schiit U-shaped unibody looks even better at this size), on looks alone the GS-X is hard to beat.
Build quality is top notch on both amps. Switches on the GS-X are heavy duty and function well, everything is well spaced and labeled, and obviously no expense has been spared on materials and parts. I sometimes do worry about scratching the beautiful front plate on the amp when moving too fast with a headphone jack but that’s a welcome concern. Likewise, on the Ragnarok the chassis and back panel give the overall impression of quality. On the front only one function is not clearly labeled (switching from speakers only \ Speakers + headphones \ headphones only). Once you know that process (RTFM) everything else is exceptionally clear. My one nag: The extending threaded pipe on the SE jack. Out of place on this amp.
The single-box design of the Ragnarok makes it the better choice for a crowded desktop, especially if you are willing to stack other gear on top of it (see my notes above on the advisability of stacking with this amp). The GS-X’s two-box design (the PSU is housed separately) requires more desk space unless you stack, and stacking is definitely NOT advised with the GS-X. Placing PSU and the amplifier directly on top of one another produces a distinct unpleasant noise floor which in my case requires a vertical gap of at least 5 inches to remove. So although the Ragnarok is big by desktop amplifier standards it still requires less room than the GS-X for desktop placement. (Note that the GS-X boxes can be placed immediately next to each other without any noise issues).
If you plan to place the amplifier in a rack (including a desktop rack) the GS-X is the slightly better form factor, due to that rear power switch on the Ragnarok. The units are both much smaller than the Ragnarok making for easier rack placement and the long umbilical is clearly designed for this purpose.
Function
The GS-X offers 4 pin, 3 pin, and dual SE outputs for maximum compatibility, while the Ragnarok offers single 4 pin and SE outputs. Practically, a 4 pin adapter will even up this disparity. The Ragnarok’s two sets of balanced inputs is a welcome upgrade over the single balanced set on the GS-X and offers more functionality for people with larger \ more complicated rigs. The Ragnarok also offers one more set of RCA inputs than GS-X (3 versus 2) so you can likely get away without an external switch in a larger set up. The GS-X offers both loop-back and pre-amp balanced outputs, while the Ragnarok offers balanced outputs and, yes, speaker outs. Your choice on a ‘winner’ as far as outputs go will depend on your specific needs. But if you want those speaker outs the choice is clear, and on inputs the Ragnarok offers greater value as well.
A note on those speaker outputs: You only need them for speakers with this amp. Any headphones you may now be running with speaker taps can be run from the headphone jack (preferably the balanced jack), because Ragnarok is not limiting power out of these jacks. So for speaker taps guys, the Ragnarok has you covered.
Regarding heat: Both are full sized, class A amps for headphone use (Ragnarok can go to class A\B for speakers), both get hot, both need ventilation space or an active cooling solution if placed in a closed rack. Nuff said.
The Alpha pot volume control on my GS-X mk2 can be adjusted with more precision than the Ragnarok relay. When level matching between the two I was usually forced to adjust the GS-X’s volume to match wherever the Ragnarok landed, which was often a dB above or below my target. As mentioned above this is unlikely to have consequences in real-world listening to the Ragnarok. The down side of the GS-X’s Alpha potentiometer is a slight channel imbalance at the absolute lowest levels on the volume dial (and perhaps a theoretical channel imbalance at higher levels as well), so a stepped attenuator is arguably the better design choice than the pots for powerful amps used with IEMs. I don’t find that to be the case with the GS-X and IEMs however, it plays them beautifully on low gain without any imbalance. And I should note that the standard GS-X mk2 ships with a stepped DACT attenuator, just like the Ragnarok. My choice of the Alpha was an option.
Both amps offer Low, Medium, and High gain settings. The gain button on the Ragnarok is fussier than the GS-X switch, taking longer to change (relays) and requiring a bit more patience and a light touch to get it where you need it to be. In fact, that’s how I would sum up the entire control scheme of the Ragnarok. Very usable, just slightly more finicky than the simple toggle switches on the GS-X.
On both amps, Low and Medium offer exceptionally low noise floor levels. Being so low, noise floors on both amps are quite susceptible to noise in the equipment chain. I found the Ragnarok never to be completely silent on Low gain, but so much so that any noise was usually muffled by general ambient noise in my office. On Medium gain the noise floor was minutely higher and increased only slightly with volume. At High gain the inevitable happens. But you’ll never need High gain. On Low gain, the GS-X mk2 is silent. Dead silent. Increasing it all the way up on Low gain it doesn’t do much to effect that. But on Medium and High gain it becomes more susceptible to equipment noise than the Ragnarok. With either amp I can clearly hear what noise is being added to the system from individual pieces of gear, but the effect is worse on the GS-X mk2 at Medium or High gain.
To summarize on Gain: The GS-X mk2 has a lower (non-existent) noise floor on low gain, but the noise floor on the Ragnarok is so low as to be negligible compared to other equipment running in your listening space, even my ‘silent’ fans. The GS-X mk2 is more susceptible to noise from the gear chain (in my rig at least) when at the top end of volume on the Medium or High gain setting. But again, you’ll never do that.
Sound
I level matched each amp\headphone combination with pink noise to 70dB (for PCM files) or 80dB (for DSD files) before listening. Volume was than handled off-board the amps with a balanced stepped attenuator when doing A\B listening. DACs used for A\B listening were primarily the Mytek192 DSD DAC (slow filter) and a Schiit Gungnir USB2, both running balanced to the amps.
The GS-X mk2 is one of the best SS amps I have listened to so the Ragnarok had a big challenge to meet. It met the challenge but didn’t run away with the competition. Frankly, when comparing level matched cans and the same chain & DAC through both amps I was hard pressed to find differences. Both amps have a relatively silent sound floor on low gain, allowing me to clearly hear the noise floor of each track. Bass, mids and treble appear to be handled equally well and with no obvious gaps (see notes with individual cans below). Both amps have more than adequate power for all my headphones: Dynamics, Openness, and Imaging were directly comparable to my hearing. Attack and transients as well.
Full Sized Cans
HD800s. Occasionally (ok, over the course of a few hours one evening) I thought the treble region was minutely louder (maybe one or two dB) on the GS-X using the Mytek DAC (“Freewheel", “Ben's Farm in Vermont”). However listening again the next day, no treble bump. At no time did I perceive treble as out of control on the GS-X, just possibly more forward. Otherwise no apparent difference, cans exhibit same their same dynamics, openness, and imaging on both amps. At this time the verdict is: they sound the same.
TH-900s. Sounded the same on both amps, U shaped and wonderful. Performance was consistent with the DAC feeding it across both amps. That is: if the DAC emphasized the bass (Gungnir) it sounded that way on both amps. A flatter DAC (Mytek), flatter performance on both amps. Neither amp added coloration or could save that god-forsaken mid-range.
LCD-X, Alpha Dogs, OPPO PM-1, HD600 - No readily apparent differences in performance. I can’t write verbiage on performance differences when I hear none. Again, both amps made clear every piece of the equipment chain, especially the DACS, but the sound difference between the amps themselves seemed minute if existing.
IEMs
I am going to delay my comparison on IEMs against the GS-X until I can determine if the buzz is just my unit. I will say the GS-X is fully capable of playing IEMs although the volume range is small, maybe a 8th of the volume dial on low gain (a little more with DSD tracks). The Alpha pot does NOT affect channel balance even at that low volume, and the noise floor is effectively non-existent. My opinion, the GS-X is a good choice for IEMs if a little (ok a lot) overkill.
Summary
I fully expect in a comparison soon someone will use the phrase “beefier” to describe the Ragnarok compared to the GS-X. Just looking at the form factor begs you to. The Ragnarok has several ticks for it in the form factor camp but my use of a rack pretty much negates that. I think clear advantages for Ragnarok are the extra inputs (no external switch needed) and speaker outputs which are going to drive some speaker purchases. All that, the power ratings (again, I didn’t measure it and it was not needed for the listening I did), and the price point make it a very attractive purchase. As for sound: I couldn’t trust myself to tell the difference blindfolded, at least at the volume and with the materials I used to listen. Other people with better ears and equipment than mine, please chime in now and tell me where I’m mistaken.
Test Tracks Used
Bass | Yello – The Eye- Track 5 - "Junior B" |
Dianne Reeves - Never Too Far - Track 2 - "Never Too Far" | |
Wiz Khalifa - On My Level | |
Mids | Steely Dan - Gaucho - Track 1 "Babylon Sisters" |
Steely Dan - Aja - Track 2 "Aja" | |
Treble | Kishi Bashi - 151a - Track 2 - "Manchester" |
Paper Aeroplanes - The Day We Ran Into the Sea - Track 2 - "Free Wheel" | |
Vocals | The National - Trouble Will Find Me - Track 1 - "I Should Live In Salt" |
Allison Krause & Union Station - New Favorite - Track 1 - "Let Me Touch You For A While" | |
Shelby Lynne - Just A Little Lovin - Track 10 - "How Can I Be Sure" | |
Johnny Cash - Tennessee Stud | |
Openness | Kishi Bashi - 151a - Track 2 - "Manchester" |
Shelby Lynne - Just A Little Lovin - Track 10 - "How Can I Be Sure" | |
Dr. Chesky's Ultimate Headphones Demonstration Disc - Track 8 - "Whip-poor-will" | |
Noise Floor | Shelby Lynne - Just A Little Lovin - "You Don't Have to Say You Love Me" |
Imaging | Pink Floyd - Dark Side of the Moon (30th Anniversary Edition) Track 3 - "On The Run" (SACD) |
Shelby Lynne - Just A Little Lovin - Track 7 - "Willie and Laura Mae Jones" (DSD) | |
Opus 3 - Test Record 1 - Side B, Track 1 - "Invention no. 14" (J.S.Bach) (LP) | |
Dr. Chesky's Ultimate Headphones Demonstration Disc - Track 1 - "When the Saints Go Marching In" | |
Dynamics | Opus 3 - Selections From Test Records (CD) - Track 10 - " 'Taint Nobody's Bizness" (Tomas Ornberg's Blue Five) |
Attack \ transient response | Dianne Reeves - Never Too Far - Track 1 - "Hello (Haven't Seen You Before)" |
The National - Trouble Will Find Me - Track 3 - "Don't Swallow the Cap" | |
Nu Shooz - Pool Side Track 1 - Dont Let me Be The One | |
Other Test Materials | Rives Audio Test CD 2 |
Finlandia Surround Test CD | |
Steely Dan - everything |
Update on the Ragnarok’s ‘left-channel buzz’
I stated above that I'm getting a buzz from the left channel of Ragnarok over IEMs. Researching the interwebs indicates that it's not just my unit. Some beta-testers have reported the same buzz: Left channel, volume of buzz doesn't change with adjustments to the amp’s volume or gain setting. While I heard the buzz only through the SE output when using IEMs, these reports indicated it occurred on both balanced and SE outputs with sensitive headphones.
A few people have suggested it's related to AC line noise and that the circlotron-style design of the Ragnarok might be sensitive to this issue. Technical analysis of power supplies & output stages or whatever is a bit beyond me so no comment there. Testing I can do though, so I hooked the amp up to a Tripplite SU750XL double-conversion UPS (perfect sine wave AC output at 120V AC +/-2% ) to test out the theory.
And the buzz went away. Well, not entirely away, but so much that people might look at you funny if you ask them if they hear it. So much that it really doesn't matter anymore after you turn the volume up to listening levels. I could not reliably hear it on anything except those ancient Shures, though on them I could still determine the right from left channels by the buzz alone.
My AC power is not especially noisy AFAIK and I have not experienced this problem on other audio equipment on the circuit, including both my GS-X mk2 and Audio-gd Master 8 amps. Given that other people have independently reported this and that it's occurred on both beta and production units of the Ragnarok, I’m gonna go with ‘It’s the amp, not just my crappy power’. People experiencing this issue should consider some good power conditioning (not just power isolation) to feed the amp.
For perspective on this entire issue, read my full review above. I don’t find this to be a deal breaker with any full sized cans, including my stock TH-900s.
Edited to re-spell the word "Chocolatey". How the heck are you supposed to spell "Chocolatey" anyways?
Edited to change the link for details on the GS-X mk2. The previous link showed specifications for the original GS-X.
Edited to add research and findings on 'left channel buzz'.