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Matrix M-Stage

100% Positive Reviews
Rated #3 in Desktop Amps


Pros: Does what it needs to do effortlessly. Mult-Gain for different headphones. No hissing @ tuned volume.

Cons: Big bright shining blinding blue LED's .

WASAPI----->Bitmatched/Perfect transport----->Maverick D1 RCA SS output------>Matrix M-Stage(Stock)----->AKG K-702


I use these with my AKG K702 headphones and there really isn't much to say.  My previous amp had no problem powering these bad boys either but it hissed and popped at the volumes necessary to do so.  With the dip switch on the bottom controlling level of gain you can be assured it will power your most sensitive headphones equally to your power hungry hogs.


The volume knob is solid construction, and its potentiometer is completely linear.  Meaning you can fine tune to the perfect level of volume for detail extraction without killing your ears.  Case construction seems solid, though it does get hot which is probably due to the case  acting as a heat sink since it is after all a class A amp meaning it does get hot.  Nothing to be really worried about though.  I took half a star off for design only because the blue LED is the most blinding LED I have ever laid my eyes upon.  It is powerful enough to make my white shirt glow blue at night.


At higher than normal listening volumes with no music playing there was no noise or hiss on this unit through my headphones(silence).  At listening levels exceeding high and entering headphone damaging/ear damaging levels  there was a slight hiss.  But it is irrelevant considering at that volume you won't have the ears for headphones anyway.


Matching levels to my previous amp there are details that I can hear in some of my songs.  On the m-stage I confused them for static initially because I was not aware of their presence before.  When fine tuning my ears to comprehend was I was hearing it definitely was part of the song and not static.  Details that my other amp could not pickup at its maximum tolerable volume.  It also has a slightly higher level of clarity to every sound than my previous amp.  It is not a huge difference but it exist and is easily audible to the point that it was not placebo. (Previous amp was the HPA of the Maverick D1).


I gave it a 4/5 in Value because soon all in one units while slightly more expensive are able to handle multiple tasks.  Such as being a transport, a DAC and an HPA and doing all three proficiently.  But if you only need a stereo RCA headphone Amp for $250 you are getting something quite special.  It has changeable gain, and two inputs as well.  If can function as a pre-amp in the future as well.


I gave it a 4.5/5 for audio quality because while I feel it sounds perfect as is it is impossible to measure that since I have not owned enough equipment.


I gave it a 5 for overall quality because it performs as an amp should.  It is powerful, silent, and clean.


Overall its worth the $250-$290, definitely not something you will want to upgrade for a long time.  (Balanced inputs/headphone outputs? Ear Speakers?)


Edit: This review would probably make an English teacher cry.  I will come back and fix it up one day, wrote this while tired.


Pros: Great sound, low price, rollable opamps if you are into that sort of thing

Cons: None realy.... maybe the form factor, since it doesn't match other products so can't be stacked well?



That's a link to my full review, which has become a very long thread.


In summary:

The M-Stage is a clone of the Lehmann Audio Black Cube Linear, which is a high end headphone amp selling for around $1k. The M-Stage matches or exceeds the real thing in every aspect. It features a socketed opamp in the output stage so you can upgrade or try different things yourself (the Lehmann does not allow this). It is built like a tank, perhaps not the most pretty thing in your audio setup but it does have a certain utilitarian charm. At this moment I think this is one of the best choices out there for people to experience high end sound at a reasonable price.


Pros: Sound quality, relatively small size, value, pre-amp

Cons: Optional DAC

Greetings, this review will be a comparison between both generations of M-Stage amps with optional DACs. It will be copied and posted to both products. First the HPA-1:

Matrix M-Stage HPA-1 w/USB DAC

This is the original M-Stage based on the Lehmann Black Cube Linear. It is a far cheaper version while still using high quality internal parts, and shares most of the sonic attributes of the Lehmann. It's become a popular economic amplifier that works well with all headphones, and has synergies with certain headphones that make it punch well above it's price point. As this amplifier is designed to run high impedance loads this comes as no surprise that it would favor some headphones over others. The unusual thing is that even some low impedance headphones seem to work exceptionally well with this unit such as the AKG K701 (and its versions). One of the most surprising and compelling aspects of this amp is it's synergy with the Sennheiser HD800, a $1500 headphone. First, it is to be expected given the HD800 is a 300 ohm headphone, but it goes beyond this. Comparing the HD800 on other amplifiers, both solid state and tube, there seems to be no equal even at 2-3 times the price paid for the HPA-1. There are some that come close, equaling in some aspects, but changing the sound in a way unbecoming of an HD800, such as the Objective 2. The O2 is about half of the price of the M-Stage and does well with the HD800, but lacks in dynamic contrast, leading to a boring experience. There are surely many amps I've not heard with the HD800, but until you reach the $1000 mark, I've not heard an equal. At this $1000 mark we finally have competition with a tubed amplifier, the Decware CSP2+ (now retired) and jumping a little more to $1400, the Bryston BHA-1 again raises the bar slightly. So long as you use the M-Stage with widely recognized strongly synergizing headphones, the value is astounding.

The build quality is reasonable for it's price, but it doesn't feel expensive. It is solid, but it's clear this is an economical device. The stock knob is small and I was annoyed with it, so I switched it easily with a knob I found on eBay for a few dollars. The dip switches for gain are on the bottom of the unit, not an ideal location, but considering they won't be adjusted often, I will give it a pass. I eventually left them on +10dB, a setting that worked well with most of my headphones. One of the great things about this amp was that Matrix socketed the opamp, meaning it was easy for anyone without electronics experience to drop in a different opamp allowing them to slightly change the sound in a way similar to tube rolling. The stock opamp OPA2134 is a good average performer. With HD800s I prefer the LT1364, but have not done extensive comparisons with other opamps.

Where this amplifier with optional DAC falters is the DAC. As it was a $30 option, I won't be too critical of it, but suffice it to say that it is an emergency DAC only. It supports PCM up to 24/96kHz. Highs are etched, scratchy. Soundstage is compressed, lacking layers. Voices are rough and weakly formed. This is the DAC you only use when you have no alternative, but given it only cost you $30, it's hard to blame it too much. Now you may expect me to suggest avoiding the HPA-1 with the DAC, but you would be wrong. The difference between the HPA-1 and HPA-1 w/DAC is merely the loss of 1 of 2 sets of analog inputs (RCA). If you are only amplifying one source there is almost no reason to not get the optional DAC. You never know when you might need a DAC and the added cost is negligible. Sold your main DAC and are upgrading to a new one? Use this while your packages are being shipped.

Even with the optional DAC being poor, I still rate the HPA-1 w/USB DAC 5 stars due to it's total package value.

Matrix M-Stage HPA-2 w/USB DAC

Starting with the DNA from the HPA-1, the weaknesses that needed work, IMO, were the optional DAC, volume knob (bigger), and the front facia looked a little too 1990s. Matrix fixed two of these, leaving the one that is easily user-changeable. The front facia is no longer gold on black and there is a scoop where the LEDs, input select switch and headphone jack are located. The stock HPA-2 knob is an attractive silver thing that is slightly recessed into the face. It's a nice touch, but the part you hold is still small and harder to manipulate. I had an additional replacement knob from when I changed the HPA-1 so I fit it to the HPA-2 and I am happy. The HPA-1 with this knob had a slight gap between knob and face, but the HPA-2, with it's recess, has no gap there. The replacement knob I used does have a small ring gap around the circumference that I didn't like at first, but now I actually do like it. The hex screws were changed from 2.0mm to 2.5mm and from black to chrome giving the face some much needed contrast. With it's modern face, the non-audio updates were more or less complete. Another physical change concerns the sides of the unit. They are more attractive and are supposed to have increased cooling capacity. Something that may have been necessary due to the HPA-2 running noticeably hotter.

So far I've not gotten specs I can fully trust. For a long time the HPA-1 was listed as having a 5 ohm output impedance on it's headphone jack. When I got the HPA-2 I was told output impedance went from 15 to 10 ohms and that doing so has increased the power output. Power output for both units is still listed the same, however. I don't know what to believe.

One thing I can believe is the HPA-2s updated DAC is truly updated, and in a big way. This update comes in the form of a Burr Brown PCM1793 DAC chip giving us expanded sample rates up to 192kHz. What used to be an emergency-only DAC in the HPA-1 is now one of the best affordable DACs I've come across. Gone are the scratchy highs, non-existent soundstage and grainy voices. It's not all rosy, though. The soundstage is still somewhat compressed, but in a way a $500-1000 DAC would be. The highs still sound slightly artificial, but they are pleasant, not grating. Voices are smoother and more realistic. The optional DAC here is fantastic value. Combined with the already high value amplifier, this is now a usable all in one affordable solution for all headphones, especially the K701 and HD800 and others that share synergy with the M-Stage. This unit redefines my conception of an entry high quality headphone rig. Pair the HD800 ($1500) and the HPA-2 w/USB DAC ($320) and you have a $1820 rig that is hard to beat even with a budget of $3000-4000.

If you enjoy the sound of the HD800 and are planning upward moves for DAC and amp, I would highly suggest the HPA-2 as a stand-in while you save money or wait out production times as I have with my incoming Headamp GS-X mk2. I currently use the Matrix X-Sabre DAC into the HPA-2 which will be replaced by the GS-X when it arrives. The included DAC on the HPA-2 is surprisingly good and should not be underestimated, but compared to the X-Sabre it's no contest.

Try as I might, I never could seem to find reliable differences between the amp sections of the HPA-1 and HPA-2. There are probably some slight adjustments and perhaps improvements in parts quality, but the end result is too close to call. If you own an HPA-1 amp only, I don't see a compelling reason to upgrade to the HPA-2 amp only. If you are an HPA-1 user looking for a DAC but are tight on space, the HPA-2 with DAC gives you this in the same space.

Bringing up the rear are areas where I find the HPA-2 lacking. With the amp circuitry largely unchanged I didn't expect the buzzing with IEMs from the HPA-1 to go away, and indeed it didn't. Matrix has been clear about this amp being targeted towards high impedance headphones, though, so I will let this pass. The only other area of disappointment was the unexpected change to gain. The HPA-1 had dip switches allowing gains of +0dB, +10dB, +18dB, and +20dB. The HPA-2 no longer has the switches and the gain is fixed to +15dB. This shouldn't affect most headphones that are high impedance or are inefficient, but unlike the IEM buzzing issue, using even full size efficient headphones with the unit may be problematic due to reduced volume adjustment range. This makes the HPA-2 less versatile since it can't be used with as wide of an array of headphones as the HPA-1. Although I will dock it Design marks on this review, since it doesn't affect the majority of it's targeted headphones I will not remove stars or partial stars. A questionable design decision to be sure.

As I rate the original HPA-1 w/ USB DAC 5 stars, it's hardly surprising, after reading my HPA-2 comments, that the updated version is also 5 stars. The HPA-2 is clearly superior, but as the HPA-1 is being phased out I see no reason why the can't both be rated 5 stars.


Pros: Fantastic sound quality! Very clean, detailed and balanced sound. Really strong power for high impedance headphones. Best buy until US 250,00.

Cons: None, really!

Fantastic sound quality! Very clean, detailed and balanced sound. Really strong power for high impedance headphones. Best buy until US 250,00..

It can drive easily my AKG K702 (famous for being hard to drive) and my SENNHEISER HD-650 (300 ohms). Multi gain level: +0db, +10db, +18db, +20db. It can drive every kind of headphone easily!


Pros: Fantastic sound, unbelievably quiet noise floor, ultra low distortion

Cons: Possibly not enough gain for some high impedance headphones

If you're in the market for a high quality, reasonably priced, headphone amp, start with the Matrix M-Stage (and you may never need to go any farther). I recently (April 2014) visited the AXPONA audio expo in Chicago (what a great expo!), and auditioned numerous headphones, and headphone amps. One of my favorite headphone amps was the Woo Audio WA7 Firefly. But at around $1,000 it wasn't in my budget. Which brought me to the internet, in search of a stand alone, possibly Class A operation, headphone amp, with good reviews. Something that maybe sounded just as good, or close to, the Woo Audio Firefly, but at a lower price tag. I purchased the Matrix M-Stage, and love it to death. Let's face it, with audio gear, we all try to get as close to the music as possible (at least I do), be it in the studio, or a live performance. I am now much closer to the talent, when I listen to music on this headphone amp. Instruments and vocals just sound so clean, authentic, and close. Even though my current set of headphones are the SONY 7506, which have won my listening tests over and over, even with these headphones, it seems like the talent is right in the next room recording. This amp's noise floor (-95 dB) is super duper quiet too. Stereo tracking of channels is perfect. If you're comparing headphone amps, make sure you at least start with this one. It is worth every cent.           


Pros: Good power, able to drive almost anything, looks nice, built like a tank, price

Cons: It doesn't make coffee

I bought this amp after reading and asking on the Head-Fi threads. And I haven't regretted a bit. This is a well-made amp, looks nice, very discrete and drives my headphones (HD650, K701 and K501) without any problem at all. The high quality is evident in both the construction and in sound. It sounds clean and effortless no matter if I use my Senn cans or any of AKGs. It is more than worth it's price and there is no more to ask from an headphone amp.


Pros: Almost everything

Cons: The iggy feet u loose a lot as they are badly glued!

As many said already before me...for the money u wont get better amp..and dont forget to do the class a opa627 opamp mod...as that gives him that extra! U wont regret when u buy this little baby..it even drove my he500 very well! But is best paired with a phone like the he300 or a grado..to my surprise it didnt do well with my iem the westone um3x
Matrix M-Stage

Matrix M-Stage SS Headphone Amplifier

Model Name/TypeMPNEAN/UPC

Specs (as published by coolfungadget on ebay)

  • Opamp: OPA2134

  • Output: discrete

  • Gain Switchable

  • Frequency Response: 10 Hz (-0.3dB) ~ 35kHz (-1dB)

  • Signal to Noise Ratio: >95dB (0dB)

  • Distortion: <0.001% (6 mW/300 Ohms)

  • Input Impedance: 47 kOhms

  • Output Impedance: Line-out 60 Ohms, Phone-out 5 Ohms

  • Output Power: 200 mW/300 Ohms, 400 mW/60 Ohms

  • Power Support: AC 220-240V/100-120V (non universal)

  • Front Panel Color: Black/Silver

  • Weight: 2 kg

  • Device Dimension: 280 x 110 x 42mm


Thought to be a Lehmann Black Linear Cube clone.

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