Am I crazy????? Try THIS

As I said, some people will continue to believe that music will set suspended speakers swinging, until they actually try it. Of course (unless you use three chains) they can swing if you get them started some other way, like a room fan.

There is a post or two on this thread that suggested that a speaker could not be moved by music, at least not in a way that could be seen by an observer and i just though i would post what i have seen; that's all. If any read anything more then that in my post, then it is your head, not mine. I have never seen speakers move since then. The 901's have a lot of drivers for there cabinet size, perhaps this why they able to moved so much from this burst of sound, maybe the canon shots in Tchaikovsky 1812 Overture would do the same thing: i don't know. I don't think music could be found that would have the right timeing in pumping action to match your speakers mass that would get then swinging more and more like a child on a swing. I must say, that there is some music that moves me.

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.