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Old June 4th, 2021, 11:45 AM
rmcfee rmcfee is offline
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ULS-15 Subwoofer speaker dead?

I have a ULS-15 from 8 years ago and it has worked great. However it has developed a problem:
a friend was doing a room EQ test and it involved a signal that started REALLY low and progressed up through the high frequencies.
At the very low frequencies the sub would make a weird high pitched squeaking sound like metal rubbing or something.
When I investigated later I noticed that if I pushed in on the woofer I could feel a rubbing sensations.
Then when I played vinyl a high pitched sound would occur and it only stopped when I unplugged the sub!
I tightened the driver screws a bit but it didn't help. It is a MASSIVE 15" speaker to say the least.
I tried a different cable and it still made the sound.
Is the driver simply blown? Thanks.
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Old June 4th, 2021, 8:44 PM
ATL ATL is offline
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I had the same problem a few years back. High-pitched chirping sound. The deeper the source material, the louder the chirp.
Luckily I had 2 subs (ULS-15), so was able to troubleshoot them by swapping amps between the two, and the problem followed the amp. So I knew it was the amp, not driver, that was at fault.
Sent the bad amp back to Hsu for repair, and that fixed the problem.
Two Channel Music System:
:: GoldenEar Technology Triton One Tower https://www.goldenear.com/products/triton-series
:: Cambridge Audio Azur 651A 75-watt integrated amplifier
:: Cambridge Audio Topaz CD-10 compact disc player
:: Deleted: Hsu Research ULS-15 (x2) DualDrive
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Old June 6th, 2021, 4:21 PM
rmcfee rmcfee is offline
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Was the repair costly?
I hooked up the HSU driver to my amp and played some tunes and there was no chirping.
So I guess that means it's the amp. Thanks.
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