I have a friend with a Sony SA-WM40. It kind of looks to me like a TV with no screen, just a grille. It is nice and compact for a 12" sub, but it does not go loud and low and when it's turned up I can hear its amplifier limiting the output so that $10 woofer doesn't fry. My 1st-gen BPD1001 positively OWNS that thing in terms of actual low output at normal listening volumes. It has much longer excursion, which I find to be a lot better for reaching down low, but it does seem to be a bit flabby in the below-20 range at higher volumes (but its Fs is 18.2 Hz so a lot of its troubles only happen very near the driver's resonance.) The only time I have been able to bottom out the 1001 on 150-watts is with a sinewave, which really gets the amplifier heated up and never really shows up much in movies anyway.