I switched amps now i have engine noise?

 

New member
Username: Halasb

Post Number: 2
Registered: Sep-09
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
 

Silver Member
Username: 2000celica

Roanoke, VA U.s.

Post Number: 180
Registered: Jan-08
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
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
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
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
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
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
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
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
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
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.
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