I'm not sure if this is the right place to post this but here goes anyway! Just bought a subwoofer to assist my computer's speakers. Problem is, it was part of a DigiTheatre system and I don't have the control unit to make it work. I can use the speaker and box but the sound isn't much better. Is there any way of making your own crossovers to filter out the higher frequency sounds or does anyone know of a site that can tell me how? Thanks!