I recently fooled around a bit with Linearteams online speaker calculator & came up with this small satellite + bass system:Satellite: One Eminence Alpha 6 in 8 liters (~0.3 cu.ft.) closed box, Q 0.7, -3 dB at ~150 Hz. The obvious partner would prolly be a piezo.
Bandpass woofer: One Alpha 8 in 20 liters (~0.7 cu.ft.) box, 8 liter front & 12 liter rear champer, resonance 95 Hz. - 3 dB points at aprox. 60 & 150 Hz.
One had to be a little carefull with placing the bass-box, since it goes so high - between the sats would probably be best. But placing it on the floor or hung up under the ceiling would be OK. I mean, it's a 'fun' system, not meant to be the cream of hifi - yet I bet it would kick the *ss of most cheap sat/'sub' systems...
Well, just a thought.