getting a low hiss

[bradl79 10+ year member]

i have a 4ch amp running component in the fronts and sub in the rears i have them bridged and have proper rms, i can turn the gain all the way down and i still get a hiss in the tweeter and mids, no noise from the bass, i have vol turned all the way down also, i can turn my key to accessory so do not have to have the engine on. could this be a ground issue? i checked all the wires and are solid.

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[audiobaun 5,000+ posts]

Id try a different Ground location first.

 

[bradl79 10+ year member]

they are hooked up to the amp. b/c hiss is coming from all 4 Tweet/Mids, i have the L/R wires running from amp to cross over and from cross to mids and tweets, if there is one loose/bad connection on one wire, could that cause a hiss on all front speakers, Tweets and mids?

 

[calebkhill 10+ year member]

What kind of crossover?

 

[bradl79 10+ year member]

it came with the JBL GTO608c

 

[calebkhill 10+ year member]

Try another ground location, a good one.

 

[bradl79 10+ year member]

its not the ground, i ran a new ground and made sure it was on clean metal.

 

[audiobaun 5,000+ posts]

its not the ground, i ran a new ground and made sure it was on clean metal.

Depends on the Metal.Not just metal,would be a good ground.A good ground would be to the Chassis/Frame of the Vehicle, not a metal spot to scratch down.Newer5 vehicles from 90 on up mainly are Cheesy Metal /unibody sub frames.Try running a solid ground wire to the body Frame

 

[bradl79 10+ year member]

this is what i was grounding to

i removed the black paint off, would this be good enough?

 

[Kastlez_ 10+ year member]

That's normal just amplified. Turn the gains down until its not as noticable.

Read my thread and the post near the bottom. A member here did many tests and found that alot of different amps and setups have this same humm sound:

*improving what I have (audison, hertz, Tru)* - Car Audio Classifieds

 

[bradl79 10+ year member]

That's normal just amplified. Turn the gains down until its not as noticable.
Read my thread and the post near the bottom. A member here did many tests and found that alot of different amps and setups have this same humm sound:

*improving what I have (audison, hertz, Tru)* - Car Audio Classifieds

i already tried that, i turned the gain all the way down and still getting the hiss from the speakers.

 

[calebkhill 10+ year member]

When you unplug the RCA cables does it hiss

 

[Kastlez_ 10+ year member]

Mine doesn't but that's a good question

 

[calebkhill 10+ year member]

Mine doesn't but that's a good question

Yea. May be the head unit ground or something else.

 

[bradl79 10+ year member]

I unplug rcas from amp and no hiss. Sub does not all period