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when shutting down my system the speakers squak

i have jbl three way loud speakers, they are tri amped. im using sae power amps from the late 70s and early 80s. no matter how i shut the system down, preamp off first and power amps second or the other way around, i get ungodly squaking sounds from my speakers. my power amps are plugged into a adcom line enhancer. no one ive talked to knows why this occurs and how to remedy this problem, do you?
airborneman
avguygeorge
2,300 posts
 
Being as I have remote input selection, I switch to an unused input;then power off. This squak might be tied to using 3 amps---or your line enhancer---or both.
eldartford
4,262 posts
 
Since the speakers are triamped you must (ought to) have an electronic crossover. This should be powered up and down with the preamp, not the power amps.
mrmitch
359 posts
 
Some amplifiers have capacitors that discharge when the power is shut down to them. Your SAE's might be one of these-I had a PS Audio amp that did that, it made an awful cracking sound when I shut it down, so I left it on all the time.
benie
147 posts
 
I had the same problem with a 25 year old Bryston 3B and was told Some amplifiers have capacitors that discharge when the power is shut down to them as well. Most of the time I just left the amp and preamp on, which I believe sounded better because it was always warmed up readt to go.
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