Stumped by comp noise/hiss

[amedeuce 10+ year member]

Ok, I've searched and searched and tried everything I could think of....

I have this hiss noise from comps with engine off and on. No alt whine.

I have disconnected power from battery and rca's from the sub amp and head unit(tantrum) just to rule it out. - same noise.

JBL px300.4 turned gains to zero, disconnected rca's from head unit and amp - same noise.

Alpine 9833 head unit grounded to battery - same noise.

Tried different head unit alpine 7892 - same noise.

RCA's are routed on different side of vehicle but do come in close vicintiy at amps of course.

Click to read more...

 

[amedeuce 10+ year member]

ONLY thing done recently is run new KNU flexible 0 gauge to (newly purchaced)tantrum and new KNU 4 gauge flexible to JBL.

I did have to piece togther the 4 gauge in a distro block to reach cause I didn't order enough - it is pieced together with some kicker 4 gauge.

Could the speaker wires be picking up the noise through the power wire? But the noise comes from both sides and speaker wire is routed on either side of vehicle.

 

[amedeuce 10+ year member]

forgot to post about grounds, had everything in word document.

Grounds for amps are good grounds - hell the grounds are grounded to try to solve this problem. Where my amp grounds are grounded, the back of the screw goes below the vehicle which I attached a ground wire to and grounded that to the actuall steel frame to make a chassis to frame ground

 

[amedeuce 10+ year member]

I was thinking it could be the power wire, but how could it be? I disconnected the 0 gauge at the battery. Same noise.

Can't be power wire and rca problem, rca's are disconnected.

I guess that leaves speaker wire and grounds.

But I know the grounds have to be good and I didn't have the problem before with same grounds and the speaker wire is the same.

Could it be that 4 gauge power wire pieced togther?

 

[amedeuce 10+ year member]

This is like my own little noise issue journal where I talk to myself about my problems....

Dear diary....//content.invisioncic.com/y282845/emoticons/cuddle.gif.bd1b29c179c0482f8313dbd790b74c94.gif

 

[amedeuce 10+ year member]

How do you check if your ground is good.

DMM lead to ground point and other DMM lead to batt neg. ??

 

[SethPhillips 5,000+ posts]

keeep it going......

check headunit ground. ground it to the chassis of the deck & wire harness. to a good ground...

 

[amedeuce 10+ year member]

keeep it going......
check headunit ground. ground it to the chassis of the deck & wire harness. to a good ground...

I'll try adding another ground to the deck chassis directly to the battery.

 

[squeak9798 5,000+ posts]

Disconnect the RCA's connected to the amp's inputs and plug in muting plugs.

If you still have a noise, then the noise is coming from the amp or after the amp (i.e. passive's picking up noise from somewhere, etc).

 

[amedeuce 10+ year member]

Disconnect the RCA's connected to the amp's inputs and plug in muting plugs.
If you still have a noise, then the noise is coming from the amp or after the amp (i.e. passive's picking up noise from somewhere, etc).

I haven't tried the muting plugs yet going to make some now, but the noise is there even with all rca's disconnected. Still need to try muting plugs?

 

[SethPhillips 5,000+ posts]

Disconnect the RCA's connected to the amp's inputs and plug in muting plugs.
If you still have a noise, then the noise is coming from the amp or after the amp (i.e. passive's picking up noise from somewhere, etc).

Reminds me.... i need to make some mutein plugs... thanks...

 

[amedeuce 10+ year member]

Ok to make muting plugs (I've seen the video) can I just take a set of RCA's cut the ends off and strip back both wires inside and twist those together and that will be muting plugs?

 

[amedeuce 10+ year member]

Disconnect the RCA's connected to the amp's inputs and plug in muting plugs.
If you still have a noise, then the noise is coming from the amp or after the amp (i.e. passive's picking up noise from somewhere, etc).

No passive crossovers, I'm active.

 

[amedeuce 10+ year member]

Help Me!!!

 

[WaTTsLOk187 10+ year member]

Switch out amps yet? Borrow one from a friend.