in other news, my Fiio E7/E9 arrived yesterday i've been using it since with my Sennheiser HD 598. I can say there is just maybe a slight improvement from my onboard sound but not a big night and day difference as suggested around the forums. So either:
a) my onboard sound is really good to begin with
b) the Sennheiser HD 598 dont need/dont benefit much from amping
c) the Fiio E7/E9 isnt just quite as good as I expected it to be
or maybe a little bit of all three.....
For me the E9 is the only reason why I'm happy with the purchase....at first I tried the E7 by itself and the sound was pretty much the same with my onboard sound card if not maybe worse, both on my netbook and my HP notebook. However with the E9, I guess what I notice is that on songs with alot of bass, the bass no longer overshadows the other frequencies since I tend to use a u-shaped curve in my equalizers. I'd be listening to a song that sounded fine and as soon as a bassy part kicked in such as maybe the chorus the mids and vocals would be recessed, but the E7/E9 solves that problem. Also, many people said that the E7/E9 greatly increases sound clarity and sound crispness, but I'm not so sure about that at least for me.
Well at least, using these has made me like my HD 598 again over my SRH 940! Using both of these headphones with the amp really highlights the lack of bass impact on the SRH 940 which makes alot of my music not as fun to listen to since there is alot of pop and hip-hop in my library. And I can always upgrade to a better DAC, since I suspect that may be what is bottlenecking the sound in this case....HRT Streamer II+, I have you in my crosshairs!!! :-D