I hope you guys who know lots more than me about these things will excuse my ignorance and give me a bit of advice..... I have a 28" Tosh w/s tv which has a socket in the rear for an active sub woofer. I currently utilise the 2 surround speakers which I got with the TV, and was wondering... a) Should I get a sub woofer to plug into that socket and, still using the 2 surround speakers, would it improve my sound ? b) If the answer is "yes"...which model and where could I get one ? ( Budget limited to £150 max ) Thanks in advance for helping out an old man!!!