AT first I got some 2.1 computer speakers. Yamaha YST-MS28, but I doubt you`ll be able to get them anymore. It has 2 inputs (x2 stereo) which can mix together the 2 inputs. I have a full 5.1 system now, but still use this subwoofer. Its not bad for £60. Though my 5.1 system cost about £370 on top of that. I`m slowly upgrading bits of it. Your not going to find a 2.1 system which has coaxial or optical inputs. Well I`d say very unlikely. Also there wouldn`t be much point either.