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A great amp that deserves a better dac than the one it comes with

A Review On: Sennheiser HDVD800

Sennheiser HDVD800

Rated # 65 in Amp/DACs
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Price paid: $2,000.00
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Pros: A great companion to the HD 800, plenty of inputs and ouputs, looks nice

Cons: Not ideal for low ohm headphones, the dac sounds no better than mid-range gear

Having owned the HD 800 for more than three and a half years now I've spent untold hours looking into ways of bringing the best possible sound out of them. When Sennheiser announced the HDVD 800 it made my future upgrade decisions easy. I took the chance of being an early adopter, getting it before any reviews were out and hardly anyone had even posted impressions. Now several months later I feel comfortable expressing just what it's really like owning in practice, and how it stacks up to other gear. My perspective might be a bit limited, as I haven't heard nearly the same scope of gear as other more well known head-fi posters, but I've heard enough that this should at least be somewhat useful to someone considering the HDVD 800 or other similarly priced gear out there.


The HDVD 800 is Sennheiser's all-in-one balanced amp and dac combo for HD 800 owners. Sennheiser has done things to optimize the amplifier in the HDVD 800 for the HD 800, such as tweaking the output impedance to 43 ohm, as that tilts the sound balance slightly as to give the HD 800 a bit more bass oomph. The downside of upping the output impedance like this is that low ohm headphones like IEMs can start sounding quite muddy and overly bassy. How this affects any pair of headphones depends on its impedance curve, so have a look at the pdf charts on innerfidelity.com or headphone.com if you're worried about that. Headphones where the impedance is a straight line, like the Audeze LCD-2 shouldn't be affected at all by this.


So finally on to the important bit, how the HDVD 800 sounds. When it comes to the HDVD 800 amplifier section (I'll get to the dac later) I think Sennheiser nailed it. I've never heard the HD 800 sound as good as it does with the HDVD 800, and it solves the problems I used to have with the HD 800. It has nudged the sound in the right direction as to make them highly enjoyable to listen to over long periods, without me ever thinking the sound is too cold or analytical. I used to own the Violectric V200 which is touted by many as the ideal companion to the HD 800 as it has a smooth top end. The problem with the V200 is that the smooth sound comes at the price of a seriously compromised sound stage. Instead of the sound stretching far outside your head and creating the illusion of the music existing as separate layers with "air" between them, the V200 creates more of a flat sound that exists close to your head. At the same time as I owned the V200 I also had the SPL Auditor, which produced an enormous soundstage as I described above, but the Auditor had the problem of sounding a bit too cold and sterile. Music just didn't sound quite natural with it, so I constantly switched between the V200 and Auditor, not being completely happy with either. The HDVD 800 thankfully sounds much better than either of those amps ever did. It has the big soundstage, and it also has the natural tone and balance. Best of both worlds, and not inferior in any way to either. Simply better.


Then we get to the negative parts of the HDVD 800, the dac. For the price you might expect to get a "end game" solution, where neither amp nor dac leave anything to be desired. This isn't the case with the HDVD 800 though. Where Sennheiser put the most effort and money is on the amp, and that is clearly audible when you plug other dacs into the HDVD 800 and compare. The markup going from the HDVA 600 to the HDVD 800 is about €300 where I live, and the dac in the HDVD 800 sounds about as good as a €300 dac. I compared it to a Asus Xonar Essence ST sound card which uses a the same dac as the HDVD 800 dac, and the results were nearly indistinguishable. The HDVD 800 was slightly more refined and smoother in the higher frequencies, but I had to listen for it. The first few seconds there didn't appear to be any difference. Not exactly the result you'd want.


When plugging in a higher priced dac like the Violectric V800, Xonar Essence One Muses Edition or Hegel HD10 the HDVD 800 dac starts sounding like an insult to the amp it's attached to. The balance of the HDVD 800 dac is well suited for the HD 800, as it's quite bassy. On first listen you might actually like the dac a lot. But when you live with it for months like I did the limitations start to become a bit too obvious. The soundstage is always about the same size, and instruments are in about the same place, no matter the recording or artist. And the bassy sound which is nice at first comes at the cost of detail, as the bass is "one note", ie vibrating bass strings sound muddy and indistinct, while a better dac with the same amp suddenly makes the same bit of music actually sound like a vibrating bass string. With a better dac the subtle difference between all recordings are laid bare, and it becomes a greater pleasure listening to music as you can pick out every single little detail which makes the tracks unique. With the HDVD 800 dac many details blend together and are obscured, so you end up with a limited range of possible sounds you can hear. I often see reviews of great gear where the author describes the gear as "getting out of the way from the music". It's one of many audio review phrases that makes me groan, but in the case of the HDVD 800 I feel it's highly appropriate to turn the phrase around and say that the HDVD 800 dac gets in the way of the music. There's just so much great sound to be heard from the HDVD 800 amp that you won't hear with the dac it comes with. Unless you have serious space limitations I'd recommend getting the HDVA 600 instead and then taking that money and saving up for a better dac in the ~$1000 range or more, since that would bring you significantly better sound.


Overall I'm happy with how the HDVD 800 is making my HD 800 and LCD-2 sound. As an amp it sounds wonderful, and the fit and finish goes well with the HD 800. They look and sound like they belong together. If only the dac was better I'd feel more comfortable giving it a recommendation without reservations. As it is now though I'd recommend listening to it first if you can, just to make sure you're ok with how the dac sounds. If you're a bit unsure I'd recommend the HDVA 600 instead, as the amp is identical to the HDVD 800, just without the dac section. It lives up to what I'd want a high end headphone amp to sound, look and feel like. If only the dac was a bit better.


 Nice review, thanks
In my humble opinion, TheManko has nailed it here and I agree completely. One thing that does need to be pointed out though (again another issue with the digital section) is that this product is advertised as supporting 24/192 sample rates on all of the digital inputs. This is not the case. On at least one of the S/PDIF interfaces -- the TOSlink -- you cannot run over 24/88.6 without sound degradation and clicking. In fact, as far as I've been able to discern, this speed limitation is documented only in the user manual that you get with the product, but not in any advertising literature on the product, even on Sennheiser's website.
Also, versions of this product with firmware at the 1.03version level may exhibit what appears to be severe aliasing noise if the audio file  being played has a lot of ultrasonic noise in it (yet another issue with the digital section). A firmware patch to bring the version to 1.04 which fixes this is available from Sennheiser.
Thanks everyone. Good points by Wisemanja, it's a bit odd how there's obvious typos of the product description on the homepage that hasn't been corrected since the HDVD 800 was released. The correct info is there in the manual .pdf download, and I've tested the Toslink input and confirmed that the info in the manual is correct. The website info is incorrect.
Good to hear this, and good to hear the HDVA600 is a nice match without the Dac 
Very informative review. Thank you.
Great honest review, coming from the Asus essence one with muses myself now sold. My impression echo yours, very happy with the amp section. The DAC does leave a little to be desired no doubt but for an all in one solution it's a beautiful package. I move on to a PerfectWave DAC now and absolutely live the combo. Thanks for the excellent write up.
WOW thanks for your info guys. I almost pulled the trigger on this at amazon for $1500 but i was not in the mood for an inferior DAC. I will wait for a sale on the HDDVD600 and get a separate professional DAC. Thanks Again.
I disagree with the inferior DAC review. Unless the Benchmark DAC2HGC is a total piece of crap. It is compared to the HDCD800 in my many hours of listening tests. Benchmark is parked for this application for now. It is a $2000 piece. The HDCD is not a midlevel DAC! I do admit that I did all this listening with carefully recorded high quality classical recordings. Maybe that is not the material to use for this type of comparison.
Hello. You mentioned that the sennheiser amp made your audeze lcd 2 sound good. As i am looking to get this combination please could you elaborate on this.
It’s been a while since I wrote the review, and since then I’ve spent plenty of time using the HDVD 800 with the LCD-2 and LCD-X. If you’re primarily using low impedance headphones like the Audeze models, then I would advice against getting the HDVD 800. I mentioned in the review that the impedance mismatch between the LCD-2 and HDVD 800 shouldn’t adversely affect the frequency response of the headphones. But from experience I’ve noticed the effect is clearly audible.
What happens when you use Audeze headphones with the HDVD 800 is that the sound becomes “peaky”. There’s more midbass, and the midrange sounds a bit uneven. The typical Audeze sound is flat and controlled in a restrained manner. With the HDVD 800 that character changes into a more out of control “in your face” type of sound, and the deep bass gets lost because of the mid bass peak. It doesn’t sound bad, but it doesn’t sound like how Audeze intended their headphones to sound. It’s an unfortunate side effect of how Sennheiser designed the amplifier. They optimized it for high impedance headphones like the HD 800, and if you want your LCD-2 to sound their absolute best this amp won’t do it. They’ll sound good! Just not how they were intended to sound.
Thank you for the advice. Unfortunately I have already order the sennheiser HDVA 600. My Dac is the audiolab MDAC. Do you think this amp Dac combo may sound better with the lcd 2? I could also perhaps change the cable to a balanced silver cable for more higher frequency extension and balance?
I haven’t heard that dac, so it’s certainly possible it might sound really good with the LCD-2 and HDVA 600. Only way to know is to hear it. I don’t have the LCD-2 anymore, but when I did I compared it using the Violectric V200, SPL Auditor and HDVD 800. I preferred how it sounded with the HDVD 800 over the two other amps, as they have their weaknesses which did more to harm the sound than the negatives of the HDVD 800 did. I expect you’ll find it sounds great. 
Getting a balanced cable certainly makes sense since it’s a balanced amp. All the LCD series headphones use the same connector, so if you in the future change to a different model it’s still usable. As for make and model of the cable, I have limited experience personally. When I bought a balanced cable for my LCD-2 I went with the Q Audio Cable, because I wanted something light. I felt the weight of the standard cable was bugging me as I could feel it weighing down the headphones. That was what I prioritized at that time. I can’t really say which cable would be the best in your case.
Hi theManko I just wanted to update you on the amp. I received it yesterday and let it burn in for around 10 hours. I have to say it sounds epic. The audilab MDAC compliments the HDVA 600 perfectly. The sound is very controlled and with amazing dynamics, bass and even treble sparkle from the Audeze lcd 2. It surprisingly blends together seamlessly. this will be my setup done. Except for cable upgrades of course.

One strange thing that boggles my mind is that the sennheiser hdva600 is not very heavy and after seeing pictures of the circuit board you realise there is no traditional chunky toroidal transformer. I wonder how it manages to produce such precision without a chunky power supply. Perhaps you can educate me.
Glad to hear it! Regrettably I don't know enough about amplifiers to tell you the how and what behind the HDVA 600 design compared to other amps.
I auditioned this amp/dac combo recently and your title sums it up correctly.  IMO, Sennheiser should have place a much better DAC inside this statement piece.  The amp section is really well done sadly the DAC really make this amp sound bright, thin, and lack dimensional.  Using an outboard DAC (NAD M51), this amp is within the striking distance of statement amp such as the Headamp GS-X MKII.
I would just get the HDVA 600 instead of the HDVD 800 and spend money on a better DAC.
A silly question needs confirmation: if I connect another DAC to HDVD800 and select that source as input, the built-in DAC on HDVD800 would be completely cut out and won't affect the amp' performance in anyway, right?
Yes, when you switch to the external inputs the HDVD 800 makes audible clicks as the relay switch changes from the dac to the external rca or xlr inputs. At that point the dac isn't involved at all. A while back I had the HDVD 800 dac connected to a computer that was transmitting all sorts of electrical noise out its USB ports. When I turned the dial from the dac inputs to the external inputs the noise disappeared, confirming that the rca and xlr inputs are truly independent, with no noise bleeding across to them.
Given what you say, would the Hugo be a better one-box solution then?  Is it likely Sennheiser will upgrade the HDVD800 with a better DAC any time soon?  Thanks.
That's a hard call, especially since I haven't heard the Hugo myself. Just going by specs the Hugo amp is much weaker than the one in the HDVD 800, because it's designed as a mobile dac & amp combo. I'm sure the dac is better, but I'm not sure it'd be enough to make up for a weaker amp. The only way to know for sure is to listen to it, or to trust others opinions. As for whether Sennheiser are going to upgrade the HDVD 800, I haven't heard anything about that. They tend to release products when they feel like it. The HD 800 has been around since 2009, and the HD 650 and HD 600 for much longer than that. I wouldn't hold my breath for a HDVD 800 upgrade, especially if they don't show an upgraded version at CES.
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