Am I crazy????? Try THIS

Line...Unfortunately no audiophile on this site would confess to having Bose 901s, so we can't check this out. :-) Maybe I'll give it a try (quickly so the wife doesn't see) with a Maggie.

Your point is well taken that those Bose 901s have a lot of driver relative to the enclosure. But the only way for a tiny push to get a heavy pendulum swinging is if the force is timed and repeatedly applied at exactly the pendulum swinging frequency: in our case this would be 1 Hz or lower. However, audio signals would push and pull more or less equally at 20 Hz or higher, with no mechanism to get synced up with the pendulum swing. Maybe you could do it with a specially designed test signal if you had a DC-coupled amp.

Eldartford...I hear you. There is one thing that i can think of that may have made these 901's move...could it be that these speakers have a port and a burst of air coming out of the port could get them to move?

Line...I have a little Boston Acoustics A40 that I will try. I have weighed it (10 pounds) and trussed it up with a rope so I can hang it. I haven't got around to doing the experiment yet...will report results.

Bottom line regarding why they sound better where they're at is that the speakers are probably in a much better acoustical spot overall! If your speakers are coupling with the room (bass) better, and imaging better(in relation to room boundaries from where you are sitting/listening), it's because the location is better than it was, in relation!
Speaker/seating location, location, location!...nothings changed...

Eldartford...I am looking forward to your report.