Hi, I already have 2 Polk TL1 satellite speakers. They only have + and - for wires in back. And Martin Logan Dynamo 300 sub. Is there any way to hook these up to a computer through 3.5mm output? I can get sound from sub using 3.5mm to rca in sub. It looks like I might need a desktop amplifier (something like this) to hook up speakers as well? That is just for passive sub and speakers though. Do they also have them for active sub and speakers that would just connect with wire? Thanks for any help.