Fun Hissing Sound

[bfillmer 10+ year member]

I have a set of Sony XS-HF500G components set up in the front of my 1991 Integra. These things sound incredible, except for the hissing sound I get when I am on a silent part of a CD. After taking it to several different car audio shops here in town the best we can figure is that I am picking up the whirring of the head unit's motor (Sony CDX-CA860X ). All the wire connections are secure, the wire is all 16 guage, and best we can figure there is not much I can do.

Also, when picking up a radio station in stereo the problem does not show up, when the song goes quiet there is no hissing.

Any suggestions?

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[chris229 10+ year member]

reconfig your gain structure for a 3/1 overlap. meaning measure your HU unclipped max output using a 0dB test tone. Then set ALL processors and x-over to clip at the same time. Finally set the amp to 1/3 of that voltage.

 

[bfillmer 10+ year member]

Only some of what you said I could understand. I am not using any external amps, only the internal one built into my head unit. I also tried switching the crossover points on the crossovers, no help there.

 

[chris229 10+ year member]

sorry didn't see you don't have an amp. Choke coils in passive x-overs are a great way to pick up noise try moving them around to see if the noise stops.

 

[bfillmer 10+ year member]

Good idea, they are located pretty low right now, as in on the floor. Problem is that if you have ever seen the inside of a 3rd generation Integra you would know that there are not alot of places to put crap.

 

[chris229 10+ year member]

If the speaker still has a hiss no matter where you put the x-over try this. Get a test speaker and connect it dirrectly to the HU. If it still has a hiss the HU muting circuit could be bad.

 

[bfillmer 10+ year member]

Yeah, I have had it hooked up to just a pair of 5 1/4 speakers, and there is no hissing we could find.

 

[chris229 10+ year member]

so you used a test 5 1/4 an had no hissing? OR are you just stating you HAD a diferent setup without problems? Use test speaker to eliminate the HU as the cause.