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Thread: I switched amps now i have engine noise? |
    
New member Username: Halasb
Post Number: 2
Registered: Sep-09
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| Posted on Thursday, October 01, 2009 - 09:25 am: |
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I was running 2 jl 500/1 amps and everything was good then I switched to 1 mmats d3500.1 now i have engine noise any info would be great |
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Silver Member Username: 2000celica
Roanoke,
VA
U.s.
Post Number: 180
Registered: Jan-08
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| Posted on Thursday, October 01, 2009 - 11:11 am: |
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Are all of your wires ran well? Power seperated from speaker wires? |
Gold Member Username: Somedonniedude
Illinois
Braaap MX
Post Number: 2761
Registered: May-07
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| Posted on Thursday, October 01, 2009 - 11:20 am: |
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Maybe your muffler fell off during installation? lol
Any damage to the rca's? Grounds good? What kind of head unit do you have? |
New member Username: Halasb
Post Number: 4
Registered: Sep-09
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| Posted on Thursday, October 01, 2009 - 12:16 pm: |
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I have a pioneer dvd headunit not sure model off hand. good ground and good rca's. but all the wiring is ran under a false floor so it is possible when i pulled the wires back to switch amps that the power speaker wires got tangled, ill check it out |
New member Username: Crave420fubar
Post Number: 5
Registered: Sep-09
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| Posted on Thursday, October 01, 2009 - 06:00 pm: |
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Are you using a capacitor just before the amp? Some amps are more susceptible to background RF noise. Are your plug wires new? |
Gold Member Username: Van_man
Boston South,
MA
Post Number: 4999
Registered: Mar-06
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| Posted on Thursday, October 01, 2009 - 09:45 pm: |
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recheck the ground at the amp.
if thats good, it may be the HU causing issues being its a pioneer.
try the grounding the rcas at the HU and the HU case.
Are you running a pair of rcas?if so, unplug one or the other and see if it stops.
if so leave it unplugged, you only need one rca as its a mono signal. |
New member Username: Crave420fubar
Post Number: 8
Registered: Sep-09
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| Posted on Monday, October 05, 2009 - 06:34 pm: |
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Ran across this definition if it helps
"Alternator Whine
A siren-like whining that appears when the RPMs of an engine increase. The noise is usually the result of a voltage differential created by more than one ground path or a poor ground path." |
Platinum Member Username: Glasswolf
NorthWest,
MI
USA
Post Number: 12442
Registered: Dec-03
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| Posted on Saturday, October 10, 2009 - 08:27 am: |
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turn down the gain on the amp. that's the most likely culprit. do you have it maxed out? |
Bronze Member Username: Domenico
Glendale,
AZ
USA
Post Number: 68
Registered: Apr-09
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| Posted on Tuesday, October 13, 2009 - 01:54 am: |
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Bad rcas
bad ground
alt whine
Most common things,
my friend Justin had to ground his rcas to stop it, it shhh-ed it quite a bit, I'll ask him tomorrow if he fixed it completely and get back with you. |
New member Username: Halasb
Post Number: 5
Registered: Sep-09
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| Posted on Tuesday, October 13, 2009 - 12:25 pm: |
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Ive given up... i rechecked my ground disconnected my caps tried all the suggestions still had noise so i put my 2 jl amps back in noise went away. is it possible that the fan in the mmats is causing the problem? |
Gold Member Username: Van_man
Boston South,
MA
Post Number: 5019
Registered: Mar-06
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| Posted on Tuesday, October 13, 2009 - 05:06 pm: |
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possible..Is the amp new?
Now that its out, hook it up at the battery with short power and grounds. dont forget to jump the power to the rem, Use an ipod as a source, then connect to the speakers.. If the noise is still there, then its the amp or speakers. try another speaker at the amp.
btw, what size wire are you uing for power and ground?
the ipod will rule out any HU and rca issues. Being that close to the battery with power and ground will rule those out as well. |
