Alpine MRP-F450....noise problem

[f2ajack]

SYSTEM: I am running Alpine F450 four channel amp to power Polk db6500 component system in front and Infinity Kappa 693.7i in rear through stock radio of 2004 Accord EX.

PROBLEM: If I turn gain any higher than minimum, amp create a very noticeable noise in the back ground. If I keep the gain at minimum, there is no issue. I am wondering, if it's because of stock radio? or bad amp? or is it normal?

PS: I am using speaker level input to connect this amp directly to stock radio without hi-low converters. I tried to use hi-low converter earlier and it had same noise issue. Any suggestion would be highly appreciated.

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[Raffi 10+ year member]

check your ground...

 

[revrider1 5,000+ posts]

Ground issue, maybe the RCA's

 

[f2ajack]

It's grounded correctly to the chasis.

 

[f2ajack]

not using RCA as I am using speaker level input harness came with the amp...allow you to directly connect amp to factory radio without hi-low converter.

 

[revrider1 5,000+ posts]

Just saw that, my bad

 

[Raffi 10+ year member]

tight ground? stripped paint to make sure its metel on metal?