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Old 06-23-2010, 02:02 PM
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Exclamation Need Help!!

Last saturday at a comp I received some engine noise after vigorous testing. During runs I turn my highs off so I didn't notice the noise until I turned them back on to demo. Well I had added a bunch of metal tape next to a RCA so I figure that was it. After taking all the tape off I still have the noise.

So yesterday I tore into my truck trying to find the cause. I hooked RCAs straight into the HU bypassing the eq, Tried rear preouts, unplugged sub RCA, ran a spare RCA directly from amp to the back of the HU to make sure it wasn't an RCA issue, and finally use a RCA to 1/8" jack to ipod (no engine noise with this). Nothing except for the RCA to ipod got rid of the engine noise which leads me to think its my HU. I plan to do a direct swap this weekend with another amp to make sure its not my amp.

My question to everyone is what should I do? My HU is a kenwood x993 and I checked the fuse on the back and its not blown. I plan to try the RCA ground method hoping that works but if anyone has any ideas please let me know. I would like to get this issue resolved before scrapin this weekend.

I've also checked every ground and they are all the same as when I attached them.
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-Single cab F150-
HU: Kenwood KDC-X993
Processing: Clarion EQS746
Front stage: (2x) Shok CB 6.5
Comp amp: Crescendo 1000C4
Sub stage: (2) AQ HDC3 10s in 2.3 cuft @ 38hz
sub amp: (2) SAZ-2500s strapped @ 1
Electrical: Mike Singer 250a alt, D3100, (2) NSB90, 70+ft of shok
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Old 06-23-2010, 02:21 PM
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... I think grounding your RCAs is pretty much the only option at this point if it is indeed your h/u. Otherwise a new h/u is in order.

Just as a side note, I had engine noise before that for the life of me, I couldn't figure out and I had tried everything... until I changed my alternator. Turns out the alternator was going bad and was giving me engine whine.
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  #3  
Old 06-23-2010, 03:20 PM
strpperpolef150's Avatar
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Quote:
Originally Posted by MisterTedster View Post
... I think grounding your RCAs is pretty much the only option at this point if it is indeed your h/u. Otherwise a new h/u is in order.

Just as a side note, I had engine noise before that for the life of me, I couldn't figure out and I had tried everything... until I changed my alternator. Turns out the alternator was going bad and was giving me engine whine.
That was my dads thought but I didn't really want to accept that as a possibility yet lol. I appreciate the response and I was able to pull everything apart to ground the RCAs and the problem is fixed! Thank god lol it was driving me nutts.
__________________
-Single cab F150-
HU: Kenwood KDC-X993
Processing: Clarion EQS746
Front stage: (2x) Shok CB 6.5
Comp amp: Crescendo 1000C4
Sub stage: (2) AQ HDC3 10s in 2.3 cuft @ 38hz
sub amp: (2) SAZ-2500s strapped @ 1
Electrical: Mike Singer 250a alt, D3100, (2) NSB90, 70+ft of shok
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New numbers coming soon.....

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