My WA33 impressions, after owning it for two months or so:
To start, no one needs one of these. It is a superfluous item to some degree, and it probably measures worse than the Chord DAVE that I feed it with. Doesn’t matter. This is easily the BEST sounding amplifier I have ever heard. I have been auditioning high end amplifiers over the last year or so and this is, to my ears, the pinnacle of amplifier design and sound quality. If you are a solid state purist, or believe that tubes “muddy” what the sound engineer intended, I urge you to put your preconceptions aside and take a listen to this amplifier. There is very little “tubeyness” to the sound, especially compared to most tube amplfiers you have probably heard or even the Woo house sound.
This is one beast of an amplifier, in every possible way. It measures 17.5” width x 10.25” length x 7.25” height without tubes, and 14” height with tubes. It is incredibly heavy, at about 50lbs, and every thing about it just feels
solid. The tactile feel of the knobs is impressive, with each turn of the selector knobs providing a pleasing
thunk with each use. The volume knob is non-stepped, which is what I personally prefer, and it provides satisfying resistance to make sure it is not inadvertently turned. The amplifier will put about 10 watts of power out, which will power any headphone out there. I also use it as a preamplifier for my speaker setup (KEF LS50, NuForce STA200), and it works great for that setup as well. You can order it with direct speaker outputs for an additional $1500, but I didn’t want to limit my speaker choices to only very high efficiency ones.
It uses four 2A3 power tubes, four 6C45 driver tubes, and 1 5U4G rectifier tube. My current preferred setup is with vintage RCA JAN-2A3 black plates (bought from eBay), Electro-Harmonix Gold Pin 6C45 tubes (bought from Woo), and a USAF 596 rectifier tube (eBay) with a Woo Audio custom 596à5U4G adapter. The stock tubes that come with the amplifier are just fine as well, but the upgraded tubes create a bigger sense of space and tighter imaging.
And the sound… it’s GLORIOUS. The biggest thing I notice with my Focal Utopias is a much bigger soundstage than with the WA22 or my Chord DAVE. The term I use is holographic, even though that may be a bit trite. It shines with all genres, but it really shines with rock. The biggest issue that I had with the DAVE as a headphone amplifier is that it can make rock sound a touch dry. The WA33 is the perfect cure for this, and it allows for guitars to crunch appropriately and singers to seem like they’re actually singing in front of you, not in a studio. With other genres like jazz and acoustic, it makes you feel like you’re sitting in the best seat in an amphitheater, watching the musicians play in real life. EDM takes on new life as well—I have never heard Daft Punk’s Random Access Memories sound so tight and nuanced. “Lose Yourself To Dance” becomes a wide spectrum of sound coming at you from all directions with each instrument and note being positioned perfectly in its own space.
Compared to the WA22, the WA33 has a larger soundstage and better detail retrieval. The WA22 is warmer though, so I actually prefer the HD800 on the WA22 than on the WA33. My Utopias, HE1000 V2’s, LCD-3F’s, and my MDR-Z1R’s sound better on the WA33 though. The ability to change output impedance and level is critical to getting the sound right on these very different headphones.
It all comes down to value. To reiterate: no one needs one of these. This is a luxury item that gives unparalleled audio enjoyment but also costs as much as a used car. I can’t tell you if the benefit in sound is worth it for you, but it is definitely worth it for me. Thanks for reading and happy listening!