Does the FiiO e9 need the e7?

[kmeister]

Hello, I recently bought a pair of Sennheiser HD595's and although I was impressed I wanted a little more volume and power. I use them exclusively on my PC that has a Realtek ALC892 soundcard. I started reading about amps and DACS, and due to a pricing error got the FiiO e9 desktop amp for $26 bucks. So my question is should I buy the e7 to pair with the e9 or is the e9 and my sound card sufficient? Thanks. btw if the e9 is good enough on its own what cord would I need to plug the amp into my computer?

 

[MEgamer]

once a signal is amplified, u wouldnt want to amplify it again, using an amp, amps usually only accept line in level signals. so receiving amplified signals, jsut to be amplified again, could dmg your headphones.