USB connection won't allow iMac to sleep

When I put my new iMac to sleep running 10.6.2, either from the Apple menu or the power button, it immediately wakes up.
I've disconnected my Firewire devices and determined that my external SoundStick speakers on a USB port are somehow causing the computer to wake up when I want it to sleep. When I disconnect them, the sleep mode works fine.
I've also noticed, even when the SoundSticks are connected, it takes about 30 seconds for the computer to go to sleep.
Any suggestions how to get around these problems, short of buying new speakers (or a new computer)?
Thanks

I'm embarrassed to tell you this, but my problem was not with either the iMac or the SoundSticks. I had the latter incorrectly plugged into a switched outlet on my surge protector. When the iMac went to sleep it was shutting down the SoundSticks, which apparently sent some sort of signal before switching off that caused the computer to come back on.
Thanks all of you for taking time to respond.

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