My Vette is hissing at me!!

Hey guys, long time no post!

I recently got a C6 Corvette, no onstar, no bose.

Replaced the stock HU with a new Pioneer X940BT, using the GMOS-04 chit show interface, all speakers and amps are stock, I didnt use the RCA harness for the pioneer at all, minus the mute/bypass trick.

Made all my connections with solder and heat-shrink, however I have a hissing out of my speakers even when the unit on mute or 0 volume (like faint static), when I try to play a track with some bass and turn it up (nothing crazy) I get distortion.

Any thoughts from the gurus of audio???

Thanks!

-S

Sounds like a grounding issue.

I have an x930bt and really hate the sound out of it.
I am a bit confused here reading this... Does the car have stock external amplification?
Or is the deck powering the whole show?

The car has a stock external amp that the GMOS-04 is utilizing (http://www.sonicelectronix.com/pdf/metra/met-gmos04.pdf), All my grounds are done through the harness via solder and heat shrink.

---------- Post added at 03:26 AM ---------- Previous post was at 03:25 AM ----------

Vette is a 07' btw

Quote:

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Originally Posted by SuperchargedRS

The car has a stock external amp that the GMOS-04 is utilizing (http://www.sonicelectronix.com/pdf/metra/met-gmos04.pdf), All my grounds are done through the harness via solder and heat shrink.

---------- Post added at 03:26 AM ---------- Previous post was at 03:25 AM ----------

Vette is a 07' btw

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OK why not try the RCA harness? Does the GMOS have a gain control on it? If you use the RCA's you may be able to adjust the gain which can help remove the noise/distortion...
You can still check the ground with a dmm it couldn't hurt.

have you connected the head unit remote output to the appropriate connection to turn on the amp? it needs to be connected for the amp to work. check a speaker lead. it should be biased to +6vdc, or close when on.

The amp trigger is done through a spdt relay per that manual I linked to, I played with the setting screw on the gmos to turn down the volume of the door chime (which also has bass in it now!?).

Hmmm