Speakers Hissing

[Knowmadic 10+ year member]

So I just finished installing my EQ and have met a new problem, my speakers all have a low hiss to them. The hiss will remain constant at any volume, and even when I remove the RCA's from the Headunit to the EQ but when I remove the RCA's from the EQ to speaker amp the buzzing will stop. These are brand new Knu Krystal wires I'm using for the 4 chan amp so I don't think it's the RCA's. Checked my ground and it is well sanded and connection is firm to the metal. Tried lowering the Gain on the amp and that did make it quieter but the hiss was still there in the background. Another problem I'm having is that when I turn off my car my sub makes a kind of popping sound. The EQ is grounded into the HU's ground wire. Any help is appreciated.

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[wickedwitt 10+ year member]

Sounds like you have ghost current on the output RCA connectors for your EQ. Ground the RCAs at that spot, maybe it solves your problem.

 

[Knowmadic 10+ year member]

Sounds like you have ghost current on the output RCA connectors for your EQ. Ground the RCAs at that spot, maybe it solves your problem.

Just tried that and it didn't work. I also have the RCA's on my headunit grounded.

 

[dabi]

I have the exact same problem! Id also be interested to know how to solve this //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[jasonAz 10+ year member]

Check all grounds, make sure well sanded and tight.

 

[Knowmadic 10+ year member]

Check all grounds, make sure well sanded and tight.

I have, I'll go check again for the 4th time though. The only ground I can't visibly see is the headunit and EQ ground

 

[Knowmadic 10+ year member]

Here is a picture of my amp grounds -

 

[jasonAz 10+ year member]

What about the EQ and headunit?

 

[fasfocus00 5,000+ posts]

my bet is that there is a component in the EQ causing the hiss, you may want to open it up to see if one of the connections is burnt or swollen. you may even have a grounding option on your EQ that would correct the issue. Audiocontrol EQs have 3 different setting for type of ground and switching that will normally get rid of grounding issues.

 

[Knowmadic 10+ year member]

Problem still persists after upgrading the wiring and running the remote wire directly to the EQ and then from the EQ to the amps. I also grounded it to the chassis and ran a power wire back to my distribution block. While this solved the popping the sub makes when the car turns off the speaker hiss remains constant. Does not change as volume goes up, does not have a high pitch due to alt, just a constant hissing. Lowering the gain on the amps makes the hiss quieter but even at 0 gain the hiss is still present just much fainter. The hiss seems to predominately come from the tweeters and much quieter from the woofers, rear speakers are affected as well. Sub however is NOT affected.

 

[baller2319]

Problem still persists after upgrading the wiring and running the remote wire directly to the EQ and then from the EQ to the amps. I also grounded it to the chassis and ran a power wire back to my distribution block. While this solved the popping the sub makes when the car turns off the speaker hiss remains constant. Does not change as volume goes up, does not have a high pitch due to alt, just a constant hissing. Lowering the gain on the amps makes the hiss quieter but even at 0 gain the hiss is still present just much fainter. The hiss seems to predominately come from the tweeters and much quieter from the woofers, rear speakers are affected as well. Sub however is NOT affected.

I have the same exact problem! It's driving me nuts.

 

[mike57]

I am new on this forum but also have the exact same issue. Any thoughts?

 

[Kingstroker 10+ year member]

HU and EQ should be grounded at separate locations

 

[Knowmadic 10+ year member]

HU and EQ should be grounded at separate locations

Why?

 

[Kingstroker 10+ year member]

not sure, that's what my 80PRS and 700BT says. Probably keeps them from picking up electrical noise from each other