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Funny problem w powered JBL sub

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(((THUMPER))) View Drop Down
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    Posted: 20 March 2010 at 1:31am

I have no idea what the idiots I let barrow them did but its my problem now. I own a set of JBL powered subs w complimenting passive subs. These speakers didn't have a real long production run n I think I'm learning why. They can be found here http://www.hoffmanmusic.com/itemdesc.asp?ic=51500050&eq=&Tp=

The internal channel on the powered sub in question is fine. However whenever I plug in a speaker and feed a signal that channel instantly flashes, then a split second later they're both going on like strobes. The passive drivers are both fine because I tested them on a good working amp. Its just the one 'jacked-up' channel. Does this mean they killed my amp? How do I determine what the problem is and what part to replace? Please phrase your replies in 8th grade level language Tongue 

THANX!


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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 20 March 2010 at 1:47pm
Can you re-word your fault description? What is going on like strobes? What is a jacked-up channel?
Kevin

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Post Options Post Options   Thanks (0) Thanks(0)   Quote djshaney Quote  Post ReplyReply Direct Link To This Post Posted: 20 March 2010 at 1:49pm
i take it you mean the signal lights?
and jacked up = fucked
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Post Options Post Options   Thanks (0) Thanks(0)   Quote The Builder Quote  Post ReplyReply Direct Link To This Post Posted: 20 March 2010 at 4:48pm
It just is.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote djeddie Quote  Post ReplyReply Direct Link To This Post Posted: 20 March 2010 at 6:23pm
Just a thought, but have you checked the leads? Might have a short in one of them.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote service dept Steve Quote  Post ReplyReply Direct Link To This Post Posted: 20 March 2010 at 7:33pm
If the passive cabs work and the active cab works on it's own and it only sh*ts it's pants when they are both connected together then it must be the leads unless by a very long shot the power supply is just about holding on with 1 speaker on it but can't bear 2, that's not likely though. Check your cables and then check them again.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Centauri Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2010 at 12:58am
I believe these subs have two power amps - one for internal and one for the extension.  As mentioned above, it could be a shorted extension cable or a fault with the extension power amp.
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