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Amp bad?

 
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Old 07-13-2019, 03:31 PM
ZX2BY2U
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Default Amp bad?

Hey, all. I got some great help previously on this forum when doing the installation of my system. Now I'm back needing some help troubleshooting what may possibly be a bad amp. As a novice I'm not confident in my diagnostic skills, so I really appreciate any help you all can provide.

I have a 2 amp 4 speaker installation with a BLX44 powering WDXMotos in the fairing and a B52 powing SVs in the lowers. Got a bit too happy on the volume and blew one of the Moto's. Swapped in a spare, retuned, and that pair works fine. Disconnected the uppers to check tune on the lowers and noticed a lot of what sounds like distortion to me in the SVs, even with gains turned down relatively low. Assumed the worst and swapped in a set of MMAT 601.4s I had on hand and got the same result. Ran a jumper to the WDXs to test them on the B52, and again got the same result.

Then I ran the jumpers to the test the SVs off the BLX44 and they worked fine. By my logic that leaves me suspecting either the B52 or the wiring for that part of the system. The B52 does play music to any speakers I hook up to it, but only at reduced volumes with lots of distortion even at minimal gains. I always assumed a blown amp wouldn't play, buy have no experience to go by. Didn't want to pull the trigger an order a new amp if I'm barking up the wrong tree.

Thanks in advance for sharing your experience and advice.
 
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Old 07-13-2019, 04:45 PM
marcodarq
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did you try different rca's or are you runnig speaker level inputs?
m
 
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Old 07-13-2019, 05:36 PM
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What’s the xover set at on the B52?
 
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Old 07-13-2019, 05:39 PM
ZX2BY2U
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Originally Posted by marcodarq View Post
did you try different rca's or are you runnig speaker level inputs?
m
Speaker level, but do convert to RCAs for LOC 35 and FMOD attenuators to cap the SVs. Then RCA back to speaker and into the B52 amp. I did check the RCA connectors, and they all seem tight.
 

Last edited by ZX2BY2U; 07-13-2019 at 05:53 PM.
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Old 07-13-2019, 05:56 PM
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Originally Posted by InthewindMN View Post
What’s the xover set at on the B52?
Eyeballed @ 100 Hz. Worked fine before playing at 3/4 max volume with bass unknowingly bumped up on HU in aforementioned incident. Now it doesn't matter where crossover or gains are set, I get what sounds to me like pretty bad distortion.
 

Last edited by ZX2BY2U; 07-13-2019 at 05:58 PM.
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Old 07-14-2019, 07:15 AM
USAproud
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Check all your cables first
 
 


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