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A Review On: WooAudio WA7 Fireflies

WooAudio WA7 Fireflies

Rated # 9 in Amp/DACs
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Price paid: $899.00
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Pros: So gorgeous even the most unsupportive of audiophile wives will allow it in without asking too many questions, sounds as good as it looks, compact.

Cons: Will take up a lot of your "spare time".

Sorry for the late reply, but here we are after day1. I should start by saying that due to working 10am-6pm today, i didnt get as much time with the WA7 as i would have liked although i did get a couple hours in and some very interesting results.

First off, some pics of when i first picked it up from A2A, god it was smaller than i thought!!!!


Next to the ever so tiny Pan Am "portable" amp... almost the same size, in fact apart from a couple mm more of  width, and half a bees bit in length (actually less) = the same size. One thing i did notice is that the 6c45's absolutely DWARFED the little dinky valves in the Pan AM. Build quality and finishes, there was absolutely no competition. Dont get me wrong, i love the sound of the Pan Am, and if it werent for the total package price, id own one (in the end i spent not a huge amount less on the WA7 considering over all cost), but the WOO feels, looks, and is just built better. The volume knob is silky smooth (after the first turn), it does weigh quite a bit though... Which i actually like. It doesnt feel like a chinese guitar pedal with a couple small tubes in it and a MASSIVE sound, it feels like what you expect... A compact american built powerhouse with no expense spared. I also had a chance to see and hold the modi/magni- that thing is also TINY, even smaller than these two, and feels heavy and well built. But the surface finish is no where near the Woo, but rather between the two. Neither rivals had hidden/invisible/no screws, the high end feel, nor design. But then again the Schiit offering is a third the price or less than a quater if you bought after the WA7 pre release. Respectable, but not in the same league, and not even tube driven- just a size and finish comparison as it was there at the time. I will go back to listen to it though as it had me intrigued as to what can be achieved with a small retail of $300 or whatever (Aus delivered with power supply, not supplied by Shiit but sourced in the same factory).

First listen was VERY brief. Buena Vista Social Club and Grado GS1000i, I could think of worse ways to start my day.

Even with these cans, this thing packed a punch. Not fully warmed up, DAC in play (had to load the driver on the PC there), and 12 o clock was verging on too loud with the big Grados. 

Thats the well built Power supply behind it, side by side its bigger than the amp in some dimensions!

Home sweet home and in business. Fully warm, and mated with Fischer Audios finest cans to date, FA002W Karelian Birch, with the non high edition drivers fitted because i like a fat deep reaching sound, and DT770 250. Via my macbook pro it was seamless at first. No driver. Select the audio input "speaker" and away i went. I used some 24 bit files FLAC and ALAC both through itunes and VLC (same tracks) and it sounded pretty darn good! But I noticed immediately that it wasnt reaching as low as id like on my usual test tracks that had gooch wrenching sub bass... whats going on? CCK (Camera Connection Kit) and ipad, same tracks- deeper sound, the sound i expected!!! GOD ITS NICE. This thing (on both devices with both the DT770 250 ohm, and FA002W 64ohm drivers) is a POWERHOUSE. 11 o clock is LOUD, im a volume fiend, but try as i might i couldnt get it much past 11 without fearing i might burst an ear drum. My teeth were grit hard at 11 and a touch (cant get past there), my brain was buzzing with bass vibration, while the high end sizzle and pops of trentemoller, radiohead, and dabrye made my sparse body hairs stand at attention. Its was the physical satisfaction you hope to expect from "the seriously good gear" at the highest possible volume you can bear. Win.

But wait, what happened with the macbook? Re-test. I didnt imagine it, its not as good? What is the ipad doing that the macbook is not? At first i assumed that i was listening to the proprietary DAC of the ipad (like an iphone would do) and that the "32 bit mac native" WOO DAC was rubbish. Then after calling a friend, we realised i was using a CCK, which means (with most amps) I should be using the WOO DAC. Then it hit us- I was so excited about all this "Mac native" stuff I didnt change the midi settings. I was listening to 16 bit on the Mac, and im guessing 24 bit on the ipad (the reason i recon its not 32 bit on the ipad is because the somgs were IDENTICAL, even with the same graphic EQ once i changed the mac to 24 bit. That being said the songs were only 24 bit recordings so who knows... Anyone got some 32 bit test tracks?

Anywoo, I was impressed  i was in bliss, this thing SERIOUSLY delivered. It doesnt sound anything like a WA6, but weirdly closer to the Pan AM, only a little more detailed and less 'fun'...It wasnt so tubey and glossy like a vaseline lubed wide lens in 80's porn set lighting, like you would expect from some tube amps, but it wasnt as icy cold and unforgiving like you expect from reference grade solid state big hitters. Was it in between? Nope, this was no hybrid amp sound. This is hard to describe. Let me try in more depth. The Woo reaches DEEP, and is POWERFUL. Its everything you want it to be and just a tad more- because its so damn sexy you feel like you stole it from the future somehow. I liked the Pan Am a LOT, its signature suits me. It has a deep sound, and trumped even the WA6 at bass, not to mention absolutely slaughtering the Schiit Valhalla in almost any respect. But what it did best, was electronica. It has a fun signature, with crisp highs, and low bass- a mostly flat smiley. I was in love with it. WAS.

My biggest fear is that the WA7 would look the business, but fall short in terms of the actual overall sound-joy i got from the Pan AM. This isnt me justifying spending more here, it cant be, i spent less. The sound, without doubt, nor the need for multiple back n forth a/b'ing the same tracks, is quite obviously better. Its similar, very similar in what it does, it just god damn does it better! I could punch myself in the face at this point. What kind of woodoo has Jack come up with? Has he done a deal with the audio devil? Yes im excited about my new gear, but im not excited because its new, I bought several new toys at once, and they are all nice in their own way, but this is the first and only one to meet all my hopes and expectations. I wont say it surpassed them, because I have listened to a lot of amps and cans by now, and i kinda knew what to expect. I wasnt comparing this thing to a fiio e10 (not that theres anything wrong with an e10), nor a NAD home theater integrated amp. I was hoping that this would be be as good as it looks, and it is... Seriously. Its a GREAT great great amp, and i would pay for it again, and again if i had to. I dont think ill ever feel the urge to buy another home amp. Dont not buy one of these amps idiot.

Every time i left the room to play with my daughter or help out with dinner, i found myself leaning back in to glance into the lounge to make sure i still owned it, and it was real.

Stay tuned for the tube rolling guide as i have 3 other (2 NOS, 1 EH gold pin) sets of tubes!!! DAC only tests to come too when i figure out how to use all 32 bits?
(for some reason spacing gets gnarly from here on, im guessing its from adding too many edits to one post? mods are welcome to interfere).
EDIT: part 2, day 3,


T50RP & WA7

Spent a night with these two bad boys.

**spoiler alert; i still prefer the Fischer Audio FA002W**

But thats a GOOD thing, why? Because what ive found more than anything [to my delight], is that so far a particular set of cans through the WA7 will sound just like that particular cans... Perhaps obvious, but not always true to other amps, and EXCELLENT news for me. So comparing the DT770 250 OHM, the FIscher FA002W, and T50RP (hardest to drive so far, got them albeit uncomfortably to 2:00), they all sounded like themselves, they all rang true. Im now starting to get more of a feel for this amp. Its really quite good, and the beauty is in its simplicity- both of design and (as i said in my earlier review post) tonality. This doesnt just sound as good as it looks, oddly enough it sounds just LIKE it looks. 

Let me explain. The physical design of this new woo to my eyes is smooth, classy, clean, but expensive and beautiful, a large portion but not all of it is also transparent (glass). Most importantly, its also very linear with only 3 prominent features:  two central glowing tubes, and a big volume knob. Once you hear this amp a few times with different cans over a few days, ALL of these physical attributes read as a genius review, a descriptive of the audible characteristics. It's an awe inspiring design, and an absolutely amazing interpretation of the sound.



EDIT: part 3 day 3,

So this just arrived in the mail:


Im guessing by the label its my NOS russian (Reflektor) matched tubes i ordered from ebay. Item number; 140906991405

"STRONG MATCHED PAIR 6S45P-E = WE437 LONG LIFE Triode Tubes, NOS, OTK, Reflektor"

Who puts stickers on tubes? bit of electrical cleaner, and a long polish with a clean microfiber, and they were ready to burn in!

Top is the stock Sovtek, bottom is the Reflector 6S45P-E/WE437 clone. Bit of a funny angle, but they are actually the same size/shape- different stamping that didnt pick up in this shot.

Burn in at this stage was minimal, but results were not.

Its not easy to fluidly explain this situation without sounding like an overly enthusiastic techno-fanboy with a new toy, raving and ranting about audio-castles in the sky. I want to be able to say, "oh well, it was only a $38 experiment in the uncharted waters of WA7 tube rolling. An educational and worthwhile exercise, but non the less the stock tubes are better *enter descriptives here*". Unfortunately/fortunately i cant do that. Chalk it down to whatever you like, the first (of three) pair of matched tubes to hit my door step, ordered the same day as ordering the amp itself a month ago, are absolute brutes!

Many are of the opinion that the amp makes the tubes and not the other way round, and i certainly agree here. So I'm not going to tell you these tubes will suddenly induce the WA7 to metamorphosis, emerging from the fog as unicorn with a glowing vacuum horn and two optional inputs under its tail (one apparently more sensitive... for IEM's). What i am going to say is this:

The Reflector 6S45P-E will significantly liven the mid range, very significantly enrich the bass (biggest change), and ever so slightly warm the highs (very minor change here). That being said, it still sounds like the WA7. All of my above notes and comments still stand "smooth", "classy", "clean", "beautiful", etc, etc. Perplexing as it may seem i guess the best way to describe it is mood. Same dude, different mood. Like using a "sports setting" on your automatic car. Same car, different feel. I personally really enjoyed the change, and doubt i will go back to the stock tubes. If your a jazz/classical listener you mayfavor the stock flavour for those genres. For rock, metal, electronica, and hiphop the "Other Russians" take over, and boldly so. 

As always ill keep you up to date with any changes or impressions... And on any more tubes arriving.

I also had a major crisis tonight that was likely my computers fault, but i played around with the midi setup, and quite a lot. I harassed it, flicking back n forth from 16-24 bit, through all the hz ranges. Violently defiling my poor MBP, until something finally gave. The WA7 started to add distortion on lower frequencies, quiet patches were not quiet. then it just stopped. Plugged, replugged, try the other USB port, tried closing and reopening programs, reset, and still nothing, then it just worked? go figure. I hope it wasnt the WOO, im pretty sure it was the macbook, we're friends n all but we sorta arent.





EDIT: part 4 day 4,

Electro Harmonix 6C45Pi GOldpins arrived last night. Stay tuned!

ALSO after emailing Jack regarding tubes, as we all suspected this was the reply the kindly sent:

"Hi Adrian,

The 6C45 is a very special tube. There is no other types can be used. Though WE437 is a direct substitute. This tube is very rare, however.




So as far as i can tell without too much effort, 6c45pi from sovtek (current production?) or EH (current production) /6s45P-E (same thing just one is krylic for the other, and the E is military) from Reflektor (NOS), and if you want to spend more on tubes than you did on the amp you can get the WE437 from Western Electric... No idea what kind of difference it would make? 


One other candidate im interested in is the 6S15p/6C15Pi, this is the same on paper to the 6c45P, and according to two online sources could be rumoured to be the vintage consumer (non military) version of the NOS Reflektor. Cant even find them though.

EHX 6C45Pi Gold pins.

So they are finally here! I was very enthusiastic about trying these out. I figured the Woo Crew wouldnt have offered a second tube upgrade option if they didnt yield results in testing. I obviously cant comment on Woo's testing (perhaps Jack can?) but in my own experience I certainly found that there was indeed a difference. The amp, although still essentially the same had new perspective, at first apart from some extra depth on the bottom end (more so than the reflektor), and having to adjust the volume slightly down, the change seemed rather minor. Then i went back to Reflektors and felt instantly unimpressed by them, the same tubes i praised yesterday? you bet. I let them burn longer.
More testing the same 10 tracks then, after waiting for some cooling off, i changed back to the Gold Pins.

[This in itself is a problem that faces all of us when actively reviewing tubes on the same single unit. Cooling times and then the subsequent warming times dont allow for an instant A/B. The solution, two WA7, and two sets of Fischer fa002w karelian birch woodies. DOnt get excited, this unfortunately (for now) just isnt an option. UNLESS someone in Melbourne with a WA7 wants to meet for a side by side comparison- i can easily arrange two bran new identical headphones, say DT880 or something? ]

After the cool/warm time, and hoping my brain had established a lasting sonic image of the Reflektors through the last 8-12 hours or so of intermittent listening over 24 hours, i settled in for second session with the EH goldies.

They are a sure improvement, a stark change. Again, not a new amp- but with further reach. Most will greatly praise the extension and sparkle these tubes add to the upper end, while others will either love or hate the extension it adds down below. For me, this is exactly what i was looking for. The difference was akin to hitting the +8db peak bass boost switch on a C421. Perhaps for those who dont own or havent heard the C421 (soon to be replaced by the exciting new JDS labs C5), this would likely mean nothing. To those people I would best describe the lower end endowment added by the gold pins as "awesome". This isnt a flat signature. With the Gold Pin EHX in place, this definitely isnt an amp for referencing, and who would want it to be when this amp sounds SO GOOD! This is how i want my music to sound, this is how my WOO WA7 will stay. For referencing actual enjoyment, use a WA7 with Electro Harmonix 6C45Pi.

This amp sounds very nice in stock form, im a big fan of it compared to the Pan Am (its closest competitor) also in stock form. As with most things audio, and often life in general, you never really notice how much better things are until you view them in retrospect. The ears and brain (at least mine), always seem to appreciate a nice improvement, but its not till you go back to what was, when the differences really become apparent.
In summery if your going to spend $999 on a gorgeous little amp, spend $60-$100 more on some tested & matched gold pins.

I havent yet tested the gold pins against raw stock, however im certain Jack has. After the time spent with both the Reflektors and the Gold Pins, i can honestly say that these are obviously offered by the manufacturer with a good reason.

Dont bother with the Reflektors, go straight for these.

For now, thats all from me. Ill be back in a week or two with more if anything comes to mind. Questions and comments are of course always welcome! biggrin.gif


Nice stuff mrbigsby. Billy shot me a pm with regards to attend a meet with him and you for the new FA-011 launch and to bring mine to compare. Unfortunately I will be out for 2 weeks at AB so hopefully we can catch up sometime in the near future to do some AB tests.
Shame, yeah I was lucky enough to get one of the first orders on an FA011 so I offered to do an AB session. Ill shoot you a PM so we can hook up some other time, woud love to see the terminations you did on your rev1...Enjoy your break!
I'm also want to bought WA7 from A2A.. but little bit late from the price 899... now is more than 1000... I wonder if still worthed to get WA7... because they are late for stocking the DAC mini... actually very interested in this tube though...
Very comprehensive and informative review, so thank you for a sterling effort. My WA7 is on order and I'm eagerly anticipating it's arrival.
Can you arrange me some brand new identical headphones -- for free? Lmao great review and great read.
I agree that old 6s45p sound fuller than new production. 
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