Technically they should affect them the same except that the e6 should have more bass authority with the way its power supply works (I think I read), but the modded hd25 and the fostex sounded very midrangey with e6. Even eqing in Winamp didn't seem to help as much as when using the e7. I couldn't tell you why that happens. A lot of people find the hd25 way too dark and bassy when amped well, so maybe that's a good thing with the e6 if you have a stock hd25. I find this modded hd25 neutral strait out of an Emu 0204 (not much electrical damping) and dark out of the e7, but it can be substantially eqed in both cases to good effect. I have not heard the pa2v2 (an amp?) or the e11. For the price the e6 is going for, I would definitely get one no matter what. It is an outstanding little portable amp that can take a full 2V input in mode three and works extremely well with headphones below 50 ohms and above 70 ohms for as high as you can tolerate the volume limitations. It might also match much better than you'd expect from 50-70ohms, but you'll have to try it in your case to find out if it's the right tone for your ears. I bought mine from someone that didn't find it to match well with their stuff, so you can also get some of your purchase price back even after 30 days. Too cheap not to give it a go.
