Yes. You can use the DTT3500 5.1 speakers with PS2 and XBOX. The DTT3500s have a SPDIF out and an Optical Out. As far as how they sound on them, they sound AWESOME! I believe on that particular set (just like the DTT2500) it has an AUX out for the addition of another subwoofer (it must be self powered). So you can add a ton of BOOM to what you already have.
Joseph