Question about Clarion M475 CD Player

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Volume control I have a clarion M475 marine unit. I have added 2 speakers making a total of 4 speakers connected. The volume output is lower now than it was with 2. How do I correct this? I have hooked up my Clarion in conjunction with four inside speakers and four outside speakers on my holiday trailer. Only four speakers are tied together at one time. The radio worked good to start, but one of my kids turned up the volume and now "AMP GRD" is displayed. I turned down the volume and cut the power for 5 minutes, but the display will,not go away. I live in Canada and received this off E-Bay a month ago, but really don't want to ship it away if I can help it. Do you have any suggestions??? I really would appricate any help! Thanks Boyd

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  • bjamison Apr 26, 2008

    The speqakers are Sony 8 ohms and there are two speakers hooked in parallel to the front right side and two hooked in parallel to the front left side. These are for the outside speakers. There is a switch to change them to the livingroom and bedroom speakers. The grounds are all connected commomly. With the positive side of the speakers disconnected, I still can't get the "GRD AMP" display to go away. Any sugesstions??

  • bjamison Apr 26, 2008

    Is there any way to get the "GRD AMP" display to go away and the system to reset??
    I have the speakers shut off on the positive side.

  • bjamison Apr 26, 2008

    I hooked up a receiver to the same speakers, and all the speakers work fine. How do I get the "GRD AMP" display to go away now that I have the positive side of the speakers disconnecdted??

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  • Master
  • 975 Answers

IT DEPENDS how you connected the 4 speakers system to this CLARION unit . if each spkr is 8 ohms VALUE , connecting it in SERIES will add to 32 OHMS resistance , that means that CLARION unit will lower the audio output . but if spkr are connected in PARALLEL It will lower the resistance and giving you more power to speakers. this SOLUTION for the speaker connections only . hope its helpful.

Posted on Apr 23, 2008

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  • Master
  • 373 Answers

AMP GRD means that the Amp is grounded which probably means a short to ground and could be the audio output circuit to ground

Posted on Apr 23, 2008

  • TV Doctor
    TV Doctor Apr 23, 2008

    Especially since the volume was turned up all the way....overloaded the audio amp and shorted it out.

  • TV Doctor
    TV Doctor Apr 23, 2008

    ginko could be right but, if you didn't use the proper ohm speakers and the volume up all the way its likely to short audio circuit.

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  • Clarion Master
  • 19,396 Answers
  • Ginko
    Ginko Apr 23, 2008

    Amp grd is amp guard error, you have a short in your wiring to speaker. Get new wires and re wire speakers, and it go away

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1 Answer

Have clarion cz200 receiver hooked it up it powers up and everything just fine but no audio...checked everything and it seems fine but no audio am i missing something? its in a 1981 chevrolet c10 pick up


With this particular unit you have a Tele mute which is cell phone related to mute volume when your cell phone rings if this is grounded then you have a problem.

1) Verify that the speakers of the vehicle are correctly hooked up , you can test your speakers by taking a 9 volt battery and touching the positive and negative leads of the speaker wires (make sure they are disconnected for radio) you should hear a click.

2) Take a volt/ohm meter set it to ohms touch the leads together this is continuity. Next touch the wire leading to the speaker to be tested and place the other lead of the meter to the bare metal of truck. If the needle pegs all the way over you have a shorted wire.

3) If using a seperate amp to power the speakers you need to insure that all connection to the amp are made properly and grounds are correct.

here is a link to clarions website to provide a troubleshooting manual.
http://www.clarion.com/us/en/MungoBlobs/341/106/CZ200_EN.pdf

One other thing to check is the center channel balance as if it is biased you need to adjust it.

There are only a few simple things that can cause no audio output
1) Volume not correct
2) Audio output connections incorrect
3) Speaker wires are bad
4) damaged speakers
5) tele mute is grounded
6)Speaker wires insulation is cut and grounding out or is not making a good connection
7) worst case Radio is defective ( it happens)

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When it comes to boats, you need lots of power and speakers.
First thing to do is make sure what you have is properly installed. Then determine what is "distorting" .. is it too much base, purely volume or what.
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Good luck.

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