maybe with quick answers, maybe not: 1. I'm getting a Yamaha DSP-E800 processor to pair with my Musical Fidelity B1 amp. I intend to connect all my audio sources direct to the B1 (as at present) so I won't be able to use a sub whilst listening to music (since the sub would come off the E800) and the E800 won't do anything beneficial for my audio signal. Obviously if I can't use the sub for music, without the E800 messing with the audio signal then I don't need to worry about a 'musical' sub. But does the E800's subwoofer connection mean I can't use some subs which have high level and low level inputs? 2. My front speakers are Rogers LS4a, which (when combined with the B1) feel like they have a competent bass coverage already - allegedly they go as low as 55Hz. Am I going to get an appreciable benefit from a small sub, even one like the XLS200, MS309, or Vita 100, or do I really need to move up a level? 3. (Sorry I lied about 2 questions!) If the above 3 subs would not add enough punch, can you recommend some boxes to look for, either new or second hand, in the upto £250 (ish) range? I don't think I'm looking for a glass shattering experience from the sub. My existing setup can already frighten children without going above 50%, but I'd like to be able to fill the real low range out a bit more. Perhaps a gentle trouser flapping experience, then... Your advice and recommendations gratefully received.