IMO, u r not going to gain more bass from wa7. Maybe, clearer, more texture in the low would be somewhat realistic expectation. To me, not worth $500 upgrade for what u r after. If u plan to have other hp later on, then wa7 would serve u very well (assuming no per hungry orthos here)
Aaaah. That's disappointing. I always thought that tube amps would lend a little more bass to my he500s. Slightly more body. Sometimes I find that the 11.32+he500 pairing to be rather conservative when it comes to bass, too controlled and tight. It is technically brilliant. Still textured, deep and rumbly. Fantastic for something hat costs $299. But sometimes I'd like for the bass to punch through the other frequencies just a wee bit more. Seems that the WA7s would add to the tone more than anything else.
The introductory price was just that. Once passed, the current price stands. From that point of view, you are getting a deal, since you missed the introduction. My opinion is that the WA7 is worth more than the current price and is really an amazing amp at any price. It will drive any headphone or IEM you have; your westones and HD650 will both sound great on it. I have westone UM2 myself. The amp is quiet, relatively transparent but has positive euphonic qualities that a tube / transformer output amp has to offer. I listen to a WA7 + Beyerdynamic T90 at least five evenings per week. For work I use an HD600 + Violectric V200 on headphone mix checks. The latter is very transparent, no euphonics, which is a necessary condition for mix checks. Euphonics are for recreational listening.
Alright then. I really really love my he-500s and I'm guessing that they're here to stay for a while. The only other headphones that I've tried and liked are the hd650's which I've sold and the LCD2s. But I prefer orthos because they're generally faster and it suits the type of music I listen to (Rock, acoustic, electronic, vocal mostly). I might get the LCDs in the future. Thing is I'm quite worried that the WA7 won't be able to feed the he500 or LCD2 properly. But I'll go ahead and try them with my cans this weekend.