Question about Sony XM-504Z Car Audio Amplifier

3 Answers

Amp worked fine for 1year, all of a sudden it starts turning on and off

Hello, I got this set up for a year now, a sony 500w amp with an xplod sony 300w subwoofer ... I got my battery changed last week and 2 days later my Amplifier turns off, at high volumes, I saw the exact same problem on another post, but the "help" didn't help, or let's say I don't nessiceryly know what a 4 gauge wire and a 8 gauge wire are, and why my setup started doing this just now, after one year! (is my battery giving out too much volts, or too much amps? it seems to be getting real hot on the outside (like when I put my hand on it I feel a little pain the first touch but after a while my hand gets used of the heat!? is that an overheating problem? it sometimes happens and sometimes it just doesn't for a while! I don't want to go back to sony and give it for service!? they'd only want more money! I'm even thinking of buying a new one!? please help me! (It does this also when the device is cold) I checked the wireing already, and everything seems fine! (I connected the Amplifier to a random MP3 player and had the same problem for a while, and all of a sudden .. it stoppen, and started working normally!)

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  • Alex Vartzbed
    Alex Vartzbed May 26, 2007

    when it shuts off, it goes into protection mode...

  • Alex Vartzbed
    Alex Vartzbed May 27, 2007

    there is another thing!

    when I turn off my Radio, or if I lower the volume to 0 ... from vol 1 to vol 0 , my sub does some kinda cracking sound!, is that the grounding?

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Its most probably that your old battery was strugeling to maintain the voltage at 14.4v. it would have then been up to your alternator to keep the voltage up. the amplifier would require a large ammount of current on a beat of a track and that would cause your voltage to drop (acting as a current limiter from your alternator). this would in turn limit your amplifier power to less than the maximum the amp (or volume setting) can/ should do.
by installing a new battery, the voltage is stabalized with much less fluctuations in voltage. a much larger current can also be drawn from the cars electrical system hence, you get a highter power output on a beat of a track.
higher power output = higher power losses in heat.
you are using your amp at the maximum threshold of power consumption. a 500W amp could require 700W of power input (thats alot of amps at 13.8V)

Posted on Jan 07, 2011

  • atish_t Jan 07, 2011


    its most probably that your old battery was strugeling to maintain the voltage at 14.4v. it would have then been up to your alternator to keep the voltage up. the amplifier would require a large ammount of current on a beat of a track and that would cause your voltage to drop (acting as a current limiter from your alternator). this would in turn limit your amplifier power to less than the maximum the amp (or volume setting) can/ should do.


    by installing a new battery, the voltage is stabalized with much less fluctuations in voltage. a much larger current can also be drawn from the cars electrical system hence, you get a highter power output on a beat of a track.



    higher power output = higher power losses in heat.



    you are using your amp at the maximum threshold of power consumption. a 500W amp could require 700W of power input (thats alot of amps at 13.8V)


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I would definately go over all connections....sounds like you have a loose wire. If you are brave take the cover off and have a look for obvious things. I had a problem like that thought it was the amp turned out some corrosion on the post of the radio (was and older unit) I shot some WD40 in the post turned it a few times bye bye crackle

Posted on Apr 06, 2008

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Posted on May 27, 2007

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