I have a set of those too, with a big subwoofer(for hearing the bass when I practice bass). And in my office I have my computer hooked up to my audio system, a real one. Makes a huge difference in audio quality when listening critically (trying to hear guitar or bass parts) or playing along. Makes practice way more fun.
I just set up a Mac Mini for a music computer next to my desktop PC. (my sons helped me as I'm mac-ignorant). Garage Band is really cool! Using a PreSonus interface to plug in my son's electric guitar or my bass guitar. Could never get it to work for two years. Should have let my teenagers set it up in the first place, they got it working with the Mac immediately.
This will also make practice fun!
I highly recommend The Amazing SlowDowner software, it can be downloaded in demo version and purchased very cheaply, it works great! I have to see if it's available in Mac version now.
Ed