I have got this new setup 2 weeks ago: - Yamaha 671 7.1ch A/V receiver - Wharfedale Diamond 10.6 fronts - Wharfedale Diamond 10CM center - Wharfedale Diamond DFS surrounds I use it for 30% music, 20% PS3 and 50% movies. I listen to music in pure direct mode for CD's (2ch. stereo) and enchanced for ipod. The sound is impressive and the bass is very clear and articualte. I have the fronts bi-amped... I am thinking of adding either an: - SW150 subwoofer OR - Dia10 MX sub But a few thoughts cross my mind. Would the woofer driver on the 10.6 fronts would just be unused (as at 100Hz it passes on to the mid/bass)? I would hate to have 2 perfectly good 165mm drivers unused...if so would it make sense to change the crossovers on the diamond 10.6 to make them work more in the high-lows and mids frequenices? I have an electrical engineer friend who could certainly come up with a good quality circuit for me... Bass is plenty strong enough so I do not want more punch..would the subwoofer offer more extension to the lower frequencies rather than sheer volume or it would just be a waste of money? Which sub would you choose from those two? Thanks!