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Originally Posted by blessingx /img/forum/go_quote.gif
Gradofan2, this is certainly the rep and in matching multiple impedances where Woo recommends the WA6, but interesting in the ToneAudio review the WA6 is recommended for the high impedance HD650 and the WA3+ for low impedance Grados.
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That is an interesting article, but it references the WA3+ as being good with the Grados, not the WA3 (noted above). As I understand it the WA3+ (as recommended by several on Headfi), removes the pre-amp circuit, and some caps, and/or adds some resistors, etc. to compensate for some of the failings of the WA3 with low impedence phones.
From my experience with the WA3, I noted a fair amount of distortion (I assume it was clipping) when driving Grado's. I talked with Jack and he suggested I get the WA4 (the WA3+ and WA6 weren't yet available), which provided transformer coupled output with greater current to drive the Grados. He suggested that even with modifications of the WA3, the WA4 would be better with low impedence phones, while still be great with high impedence phones.
Since I had my WA3, Jack has released the WA6, which he reports is great with both high and low impedence phones... and his suggestions, seem to be supported by the various comments I've seen elsewhere on these forums.
In light of my experience with the WA3, Jack's suggestions, and the comments I've seen here, I must admit, I'm a bit surprised by the reviewer's comments regarding how good the WA3+ is with low impedence phones vs high impedence phones. That would seem to add another potential amp option - because the WA3 certainly sounds great with Senns... and since it's vary similar to the WA3+, I assume it would also.
Decisions... decisions...