2. amps-preamps
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woofers gone wild

Hi folks,

My new Unison Unico amp sounds fantastic, but there's something slightly strange going on that I've never seen before.

When the amp turns on after its 20 second slow start, the woofers on my speakers make a popping sound and recede about a centimeter back into the cabinet. What the heck? Is that normal? When I switch black and red on the back of the speakers, the woofers pop outwards. Either way, the woofers pop back to normal when I turn the amp off.

Any clues as to why this might be happening?

Thanks!
lousyreeds1
lousyreeds1 OP
281 posts
 
Thanks for the continued help. There are no dealers or technicians in the area, but I do have a friend who's an excellent mastering engineer and quite good with electronics. Is this something anyone decently versed in electronic repair can fix, or do I really need a specialist? Would someone be willing to explain to me in laymen's terms what the adjustment would involve?
shadorne's avatar
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shadorne
7,333 posts
 
For starters you could simply check the DC voltage at your speaker terminals with a digital voltmeter and see what this reads with power on and power off. I would suggest contacting the manufacturer with the results to find out what is an acceptable DC offset.
lousyreeds1 OP
281 posts
 
Thanks Shadorne, I'll do that.
line
107 posts
 
Just curious... would that have somewhat of a degaussing effect on the woofers magnets or not?
eldartford
4,262 posts
 
From the pictures I see it looks like a really nice amp for the price. Dare I say DK-like in concept :-)
If the problem is just misadjuctment of the pot to null DC offset it is a real easy fix. In fact, the circuit board may have markings to identify the pot (probably in Italian) and if so you might adjust it yourself. The amp, and your speakers, will sound even better after you correct this problem.
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