kicker kx 300.4 causing engine noise

[scrappy 10+ year member]

Iv had my 300.4 for 4 years and have never been able to get rid of the engine noise. I was staying in an apartment so I had a shop install it in my truck instead of my car. They tied a ground loop isolator and it made it owrse.l They swapped out the kicker with an alpine and the noise went away. They have the sub rca on the same side as the power wire. I asked them to swaop sides and they tried to charge me for it since the noise went away with the apline. Would moving the rcas and trying to reground it work or should I just look at a new amp?

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[zachzchw 5,000+ posts]

When they tried the Alpine amp, was EVERYTHING else the same in the install? If so, that would pretty much narrow it down to being the amp.

 

[scrappy 10+ year member]

Yeah they didnt change anything

 

[zachzchw 5,000+ posts]

Yeah they didnt change anything

Certainly seems as though its the amp then.

 

[scrappy 10+ year member]

yeah ive had a feeling for a while that it was the amp but polecat said kicker hasnt had any noise to signal problems. Ill probally look into the new zx series amps

 

[Polecat 5,000+ posts]

well not to say there isn't an RCA issue on the amp, sounds like there is...

 

[scrappy 10+ year member]

On the new zx series amps what does kicker mean here? these are some of the quietest power-producing pieces from the KICKER labs, thanks to balanced differential inputs that help eliminate any four-channel noise. aAre four channel amps more prone to engine noise? The initial kicker shop told me that but they sucked so I wasnt sure to beleive them or not. Would I be able to tell a difference netween the zx and kx series amps? I dont really want to build a new amp rack so Ill probally go with the 350.4