OK, so I made the jump to buy a sub to go with my sony strde697 (100W P-C), but it's not going well. Started with an Aural Envelope AC10 (80W): Loved the constant rich undertones that it added, but had to play at nearly full volume (75/79). Plus, it buzzed (especially at 79!). Decided I needed more power (room is 6m by 6m), so took it back and got a Gale 3090 (150w): Initially, heard nothing; realised it wasn't switching on (auto power off). Plus test tone produced no sound. Sony manual said "If nothing's coming out of the sub, set front speakers to small to get the bass circuitry to redirect to sub". Still nothing, unless there's a sudden hit of bass; and now no bass comes out of the other speakers. Questions: 1) Is a sub supposed to be able to supply all the bass? 2) Is a max crossover of 150 Hz enough to capture all the bass from a Sony? 3) How can you get a surround effect (based largely on bass?) from just one speaker (the sub)? 4) There must be a delay when the thing auto-switches on, so I'm losing the first hit aren't I? 5) Since it keeps auto-switching off for low-bass dvds, aren't I going to be missing most of the hits? 6) Any chance I could configure this so that I get a near-constant rich undertone? (I've tried DD and DTS.) Thanks people, in hope!