I am currently running a 5 speaker set up. so I was going to bi-amp my front speakers, to utilize my unused channels. But when I do that, I get a squeal from the front speakers as the unit powers down. I am using PSB Image 5T's for my front speakers. any suggestions?

Posted from Tips and Tweaks forum:

Something is obviously wrong! That squeal has the potential to be a tweeter killer, so I would limit your experimentation. Check for solid connections on your interconnects. You might substitute some expendible speakers for your good ones while trying to nail down the problem. Try swapping amp channels to see if the problem travels with a particular channel of your amp, or if it travels with the output of your preamp. Be careful with those speakers though!

I don't agree that this neccesarily indicates a problem.

I had the same experience you describe with my 750 two years ago. Here's the thread in the 750 forum:

http://ubb.outlawaudio.com/ubb/Forum2/HTML/000012.html

Basically Scott in Outlaw CS indicated that the sound described in my post is normal capacitor discharge. The discharge is only audible because the 750 does not have circuitry that cuts the output to the speakers on power off. Outlaw Support, Parasound Support and Sonus Faber support all agreed that this is not harmful to the speakers in any way.

I assume that the 770 has a similar design to the 750 in this regard (no 'protection circuit'); I would call Customer support to confirm this if I were you.

Hope this helps,
Tony.