Noise filter Q

[Xprime4 10+ year member]

I'm getting tired of this. Since i put a new amp, there's a weird background noise and whining when the car is on.

Headunit is ground at the same place as eq. good gound here. When there's only the frontage amp hooked and playing, no noise at all like it use to be b4 i put the sub amp . As soon as i hook the class d mono amp (x5000.1 prototype of some kind), the noise gets here. the sub amp make the other one whine when hooked if that make sence

frontstage amp is hooked on a chassis ground, same place as the rear battery ground. The x5000.1 is grounded directly at the batt neg. Between the rear batt and the chassis ground, there's like 1.5 feet, 0awg between. No difference between the voltage at rea batt and chassis. could that small distance makes the frontstage amp whine?

if not would a noise filter get me rid of that without affecting the sq? other ideas? i tried putting a small wire to from the x5000.1 amp to the other ground to "stabilize" the voltage, didn't work either

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[Xprime4 10+ year member]

bump, any experience with those in last resort?

 

[Xprime4 10+ year member]

did alot more testing yesturday, nothing work to get rid of this.

any comment on noise filter ...

 

[zierbox 10+ year member]

Your description is difficult to understand

I sure the engine noise kicks-in when plug the RCA cable into the new bass amp

Have the car and system “ON” plug and unplug the RCA signal cables to the new bass amp

Sound like the bass amp is causing some type of interference to the input signal, back feeding to the rest of your system

You can try a RCA level Ground loop Isolator type filter

A bad designed or damaged input section of an amplifier can cause this

An external equalizer is very common to noise problems; however you claim you have no noise with out the bass amp

 

[Xprime4 10+ year member]

Your description is difficult to understand
I sure the engine noise kicks-in when plug the RCA cable into the new bass amp

Have the car and system “ON” plug and unplug the RCA signal cables to the new bass amp

Sound like the bass amp is causing some type of interference to the input signal, back feeding to the rest of your system

You can try a RCA level Ground loop Isolator type filter

A bad designed or damaged input section of an amplifier can cause this

An external equalizer is very common to noise problems; however you claim you have no noise with out the bass amp

exact... i did all the test i could, and it's definitively the amp. I even put my older amp with the same wire and no noise.

I guess it's the bad side of going with a prototype amp... it was probably faulty out of the factory. any noise filter better than the other? i see amperage rating on some rca noise filter... does it mean anything or just marketing bullshit. preout from the eq is 7v