Question about Sony XM-2002GTR Car Audio Amplifier

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Amp works but no sound from sub

Ive checked and double checked all my connections between the deck amp battery and sub. no wires are exposed. recently a speaker was shorting out on my chassis because the magnet in the speaker attached itself to the chassis so all speakers didnt work. i readjusted the speaker and secured it the 4 speakers worked fine but my sub didnt work, i tried using another sub but still didnt work, i also tried another headunit and still nothing. my amp is only about 7 months old and i'd had 2 have to purchase a new one if mine can be repaired. its a sub is a 1200 sony xlpod headunit and speakers are pioneer

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  • ellejay_21 Jan 03, 2009

    I have the same amp and I have two JVC subs I am trying to get working...No sound is coming from the subs and they are new out of the box. I got rid of my last subs because I thought they didnt work. The light is on inside the amp but no sound is coming from the subs.

  • ellejay_21 Jan 03, 2009

    By the way..my stereo is a jenson....

  • Just1Garcia Feb 05, 2009

    I just bought a JVC KD-R200 my car has a voice navigation system and just about every single head unit states the navigation will work but the voice will not or atleast will not be heard. Is tehre anything in teh market that can correct this?

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  • 108 Answers

Some older Pioneer radios require you to connect the Subwoofer RCA to the rear output on the back of the radio and then you have to turn on the subwoofer in the menu on the radio. What model Pioneer radio is it? Also, make sure that the RCA plugged into the amp is on the input side, not the output side.

Posted on Aug 10, 2008

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I have all alpine speakers,deck,amp, and subs. My subs were working for about a year until one time i started my car and they keep cutting in and out .. at times they will work but then they cut off...


Sounds like blown subs, in the process of completely dying out, or a loose wire, possibly inside the box or from the box to the amp. Have your subs tested at a sound shop, or using a multi-meter, check for resistance across the sub terminals. An open line indicates a blown sub.

Jan 19, 2011 | Alpine MRP-M500 Car Audio Amplifier

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I have this hooked up and works fine with the key on, but when i start the car, sub light, amp and sub dont come on.


You have connected it to the wrong power wire - one that is only active in service mode - first key position.
You should draw a wire directly from the battery (don't forget to add a 40 amps fuse on the wire) to the amps. If you don't want them constantly operational (you will have to manually shut them down) install a relay on the wire with the command coming from a wire from the instrument key position - second position of the key. Use a voltmeter to identify the wires.

Oct 15, 2010 | Rockford Fosgate Power 351M Car Audio...

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Noise through car speakers when connected to amp


If the subs are making a humming or RPM sound check your ground on the amp , make sure its a good ground. Always run your power wire from battery by itself down one side of vehicle. Groun should be no longer than 2 feet. If that dont help you can buy a noise supresor that goes inbetween your head unit and amp through RCA's with a ground on it . Hope this helps.

Jul 25, 2009 | Alpine MRD-M1000 Car Audio Amplifier

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I have an Alpine MRD-M605 amp that recently has started having issues. My subs only produce sound when my deck is turned up full blast. The setup had been working for over a year with no problems. The subs...


If your deck is aftermarket; Does it have a dedicated Subwoofer output? if so, check the control in the deck (sub gain). If you are using a factory radio, and a high to low level adapter (speaker wires to RCA), it may be bad (not too uncommon) or check your fader front/rear any difference? Otherwise, you have one of two problems. A bad preamp in the deck or a bad pre amp in the amp. Both are fairly uncommon. More than likely it's a setting. Hope this helps

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Amp works on other subs, not on mine


Hello adeisenroth,

Sounds like the voice coil(s).

First make sure that the braided wiring going from the sub cone to the voice coil(s) have not come loose. Examine the braided wire all the way from the terminal to the cone. If one or more has come loose, it can sometimes be resoldered. Just be careful with the heat.

If all the wiring is intact, you can check the coils with a multimeter. With the sub disconnected, and the meter set to the lowest resistance scale, test across the speaker terminals. Depending on how the coils are wired you should measeure somewhere between 1 and 4 ohms. If you get "0" or no reading at all, one of the coils is open. If you get "infinity", a coil is shorted. Sometimes only one coil is bad and you can still use the sub, wiring it to the remaining coil only. Once you have determined that one set of coils is either open or short, you can remove the jumper and test each coil individually.

You can test most any speaker voice coil with a small battery. The best to use is the 9V type that has terminals right together. Connect a short piece of speaker wire to the sub terminals, and hold the other end of the "+" wire to the positive battery terminal, then quickly touch and remove the negative battery terminal with the "-" wire. The sub cone should move outward, and you should hear a brief thump. If no cone movement, and no thump, the coil is defective. Do not hold DC to a speaker for any period of time though, just touch and remove. And NEVER use a high-current battery, like a car battery for such a test. If the coil is not already bad, high DC current will damage it.

Either short or open, replacing a voice coil is a job for the Rockford-Fosgate professionals.

Apr 18, 2009 | Sony XM-2002GTR Car Audio Amplifier

1 Answer

Amp powers on but sub does not come on


I would double-check your RCA's on the amplifier. You should hear a thud if you unplug them. If not they are either not hooked up or defective.

Feb 07, 2009 | Sony XM-2150GSX Car Audio Amplifier

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make sure you have the wires from the amp to the box, and the box to the subs hooked up right... red is positive black is negative

Dec 28, 2008 | Sony Xplod XM-554ZR Car Audio Amplifier

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My JL subs just dont beat like the ONES IVE HAD before as well as the ones my friends have had


sounds like they have your sub amp in mono but they put the speakers in series which totally cancels the benefit of running your amp in mono. you will probably be happier if you just hook the left speaker to left plus and minus and the right to right plus and minus. Cuz even though subs aren't directional they do pass some higher frequencies that are and that dilutes the stereo effect.

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Sony xplod xm-554zr amp


if you are trying to run some highs with built in high-pass crossovers off of a amp that is setup for subs(amp is on low-pass) then your highs will not work. You are better off running another amp or running them off of your deck...

Aug 18, 2007 | Sony Xplod XM-554ZR Car Audio Amplifier

1 Answer

HELP please!


ok on the factory radio there is an adapter kit you can get that plugs into the back of the headunit and will push the sound to the subs i had one in my car till i got a new headunit and it worked fine. id recommend that you go to your local sound shop like a detail shop or some place that installs them for a fee and ask them what you think

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