hissing in speakers using xm - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 03-17-2006
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hissing in speakers using xm

Well I installed my XM Radio and put my antenna on the dash and it worked great.
thanks everyone for your help with that.

Now for my new problem. I am using the line out on the unit and a monster cable mini plug to rca cable to connect it to my Rockford Fosgate radio line in, I figured this would be the best set up. Now for my problem, when I switch to aux in on the radio I am getting hissing noise coming from my speakers but the music comes in clear. Has anybody else had this problem when direct connecting to a headunit?

Chad
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Old 04-02-2006
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Yes, I have a Jensen double din in dash DVD player and an Delphi XM2Go and if I run the line in I get the hissing sound as well if I have the power plug plugged into the cigarette lighter. If your XM reciever has a battery try running it on that with the line in and it will probably quit making the hissing sound.
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Old 04-02-2006
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You bet. It's a ground loop and the noise is from the switching regulated power supply. You can do two things:

1) Use your head units power and ground to feed the power unit for the XM radio.

2) Substitute a linear 5 volt regulator (is it a RoadyXT?) or 6 volt regulator (Roady or Roady2 and most Audiovox I think). The XT scarecely heats up my homemade 5 volt regulator and the noise is MUCH lower.

That's what I had to do to solve the problem. I don't think Delphi should use those noisy switching regulators for radios that might be direct connected. You'll never hear it in the modulator because in that case there's no "loop" through the power wiring.
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Old 04-02-2006
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I had the same problem with my Sirius, used a Ground loop connector i bought at an audio store for 15$ and the problem no longer exsists! it plugs into the RCA cables ..
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Old 04-02-2006
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Quote:
Originally Posted by n3elz
You bet. It's a ground loop and the noise is from the switching regulated power supply. You can do two things:

1) Use your head units power and ground to feed the power unit for the XM radio.

2) Substitute a linear 5 volt regulator (is it a RoadyXT?) or 6 volt regulator (Roady or Roady2 and most Audiovox I think). The XT scarecely heats up my homemade 5 volt regulator and the noise is MUCH lower.

That's what I had to do to solve the problem. I don't think Delphi should use those noisy switching regulators for radios that might be direct connected. You'll never hear it in the modulator because in that case there's no "loop" through the power wiring.
i'd do the first thing john suggested and use the head unit's power and ground.
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Old 04-03-2006
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Quote:
Originally Posted by Blurple
I had the same problem with my Sirius, used a Ground loop connector i bought at an audio store for 15$ and the problem no longer exsists! it plugs into the RCA cables ..
I wondered how those worked -- I would think they are small transformers. Is the sound as good as it should be with them? I think Radio Shack even sells those ground loop cables. That might be a good solution in many cases -- my only concern is the sound quality.
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Old 04-03-2006
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well it sounds awsome...i used the FM modulator before...it works way better then that crystal clear...it adds resistance or something they were saying..totally 100% god rid of the whine...and i wouldnt be chopping up wires to do that id rather keep the cigarette lighter option jsut in case i ever sell it or wanna transfer cars and not go through the hassel of trying to pry out every deck and wire them up...more of a pain..try the ground loop connector first..its a cheap fix and easiest
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Old 04-03-2006
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Ha ha! Chopping things up is my specialty...
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Old 04-03-2006
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lmao me 2 but when it comes to that no way LOL..my buddy asked me the other day...im not good at this can u do it for me..im like you do it if you break it you learn if you cant remember how it goes back together you have spare parts..thats the only way you will learn me doing it for you wont how do you think i got this far..he just looked at me like i was crazy.
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Old 04-04-2006
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I have the ground ran to the head unit so I will try the power wire and see what happens. I tried using the internal fm module it works ok but the sound quality sucks.

Chad
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