Hello guys. I recently bought a pair of decent headphones, I got the Audio-Technica ES7s. I love them to death, but have got two problems. The first problem is really not with the headphones, but more with the conversion between speakers and headphones. I have some Logitech Z-5500 speakers, and use the headphone port on them to drive my headphones. Because of the big loud speakers, and the small not so loud headphones, there has to be HUGE volume adjustment when switching between them. I will have the on-computer volume at around half, and the Z5500 volume at about 1/4, plug in headphones and have to basically boost both all the way to full. This is not a huge deal, but something that wastes time, and is sure to cause an accidental REALLY loud speakers blast late at night or something. Sure, it is possible to plug the headphones into their own output on the back of the computer, but the speakers are hooked up over Optical. My soundcard is not able to play audio on both the Optical out and an analog output at the same time. The second issue, is the bass. I happen to love bass, and apparently a very large amount of it. Why do we buy the Z-5500s anyways guys? These headphones have it, and are very capable. But I still feel it is lacking when plugged into my Z5500s. I've got some very old Labtec speakers that have a bass/treble knob on them. While it is killing the audio quality adding static and stuff, it does add a nice hardware bass boost that sounds amazing. Basically, I figure both of these can be handled at the same time. I need something I can plug into a 3.5 headphone and has input for 3.5 jack headphones. In the mix, it would be great to have a separate volume boost and bass boost feature. I am no audio-phile; I do not need the $1000 option of doing this. I would prefer to spend under $50 to get the job done. I am new to the entire high-end audio thing, and really don't have any clue what to do. I know what I want, but can not seem to achieve it with what I've got. I am supposing these are what you guys call headphone amps. Hit me with my options, you guys are the best.