Bizzare, to say the least.
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=44127
Printed Date: April 27, 2024 at 12:28 PM
Topic: Bizzare, to say the least.
Posted By: pimpincavy
Subject: Bizzare, to say the least.
Date Posted: November 30, 2004 at 11:57 AM
There is something very strange going on with the amps in my friends car, ill try to tell this story the clearest way possible, hopefully it wont be to confusing.
It started when my friend took his sytem out of the lincoln to put it in his winter car. Well, turns out the tranny was screwed on the winter car, so he put the linclon back on the road, and put the system back in.
After the install was finished there was some horrible alternator whine coming through the speakers, I suggested re grounding the amps. He has a kenwood amp for his subs and a little 100W for his speakers, both use the same ground wire. No matter where we grounded it, the whine would continue. Then we noticed that when we had the ground from the 100W unhooked the amp would still work fine...with no ground wire connected, and the whien went away almost entirely!! But it gets weirder. When the 100W is not grounded all the controls will control the kenwood amp. If you turn up the gain, bass boost, etc. on the 100W amp, it will control the subs. How is this possible??
The RCAs are dasiy chained, and the same power and ground wire are being used for both amps, but I cant see how that would effet anything.
The 100W amp is make by Cummings, which makes tools, in fact my friend got it at a tool show for $10. Its a tiny amp.
Can anyone shed any light on this situation??
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Replies:
Posted By: /R7
Date Posted: November 30, 2004 at 12:07 PM
are RCA's bi-directional? maybe switch which amp recieves the RCA's first. or instead of daisy chaining, buy a set of Y splitters unless thats essentially what your doing now.
the power and ground shouldnt be affecting what the 100w is doing to the other amp
are you running the ground right to the battery? that would be my suggestion, i gained a lot more volume out of my speakers doing that, and the noise was cut down a slightly (sh*tty deck, always has noise -_-)
if his deck has 2 preouts (front/rear) hook 1 amp to the front set, and 1 amp to the rears, for the sub(s). eliminates daisey chaining. but you will have to use a Y splitter if the one amp is a 4channel for his in-car
Posted By: spl-Hz
Date Posted: November 30, 2004 at 12:29 PM
or you could eliminate the small amp and use radio power if it's a decent deck. Just my suggestion.
Posted By: bumpingjeep
Date Posted: November 30, 2004 at 1:06 PM
wait a tick...there is no way that your interior amp should be working without the ground connected...sounds like it might be grounding out through the rcas...might wanna check into those rcas
Posted By: DYohn
Date Posted: November 30, 2004 at 1:21 PM
bumpingjeep wrote:
wait a tick...there is no way that your interior amp should be working without the ground connected...sounds like it might be grounding out through the rcas...might wanna check into those rcas
Exactly. See if any are damaged. ------------- Support the12volt.com
Posted By: Ravendarat
Date Posted: November 30, 2004 at 1:52 PM
Also if the amp is screwed down to metal, and it has a defect it could be grounding through the chasis
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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer
Posted By: azidrane
Date Posted: November 30, 2004 at 7:57 PM
I was just going to say that. I bet its grounding via the chassis. I bet the whole inside of that amp is toasted so the way its dasiy chaining is coming out all wrong.
Posted By: pimpincavy
Date Posted: November 30, 2004 at 8:30 PM
Its not screwed down, but chances are its the RCAs, in the next few days me and my friend will switch some stuff up and see how it works.
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