Question about Philips GEMINI XG-2001 Fan CooledBridgeable Power Amplifier Car Audio Amplifier

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Left Channel Not Working

I got my amp as a swap: website for disco kit... i have found that the pre amp stage is fine, it shows both channels on the front of the amp, but it doesn't come out through the left speaker. I have changed all the external wiring around to check if it was that, but nothing has changed the situation. On closer inspection inside, i found a wire that had come loose, which i have soldered back on. I have also inspected the base of the main board and all seems ok. Any ideas?

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Re: Left Channel Not Working

Hello fakeman_56, You may have blown the power output amplifier on the left channel. This is what this looks like. You will have to take some measurments to determine if the output power amplifier is indeed malfunctioning. I hope this helps, Thank you, shuttle83,

Posted on Oct 09, 2007

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Rear left channel makes my speaker pop cuts in and ou at certain settings

Swap left and right speakers. Does it stay with the speakers if so you have a blown or damaged speaker. If not then swap input cables only. If it stayed with the speaker you now know the amp has a bad channel and needs repair. If it swapped again you either have a bad cable or issue with your source unit.

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Could try switching right and left subs. If the problem moves to the other side pull the wiring and redo.
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Have you checked the final transistors on that weak channel? They may look fine but may be weak. You can pull them and check them on your multimeter with the diode check and cross it with the data sheet for that transistor.

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Amp powers up. the right channel works fine left not at all

If you didn't find any burned parts that would mean one of the buffer amplifiers before the power amp could have died. They could either be transistor based or opamp based. They are fairly low power so they will not explode like the output transistors like to do. Contact rockford, they should be able to send you a schematic. Let me know I will try to help you through it.

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Have you moved all of the switches, controls and RCA jacks to make sure that the problem isn't a dirty contact?

Have you tried swapping the RCA signal cable from a working channel to confirm that it's not a signal problem?

Have you swapped a speaker from a working channel to the dead channel to confirm that it's not a speaker problem?

It's unusual that one channel goes dead and the rest work.

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I recommend you swap your left and right input cables to make sure it's not a source issue.

So from your headunit, plug the left channel output into your amps right input and your right channel output into your amps left input.

If the same side is still not working then disconnect both (or single speaker if it bridged) the speakers from the not working side at the amp. Connect the front and then the rear speakers individually and retest to see if one of them works.

If one does work then check the cabling and speaker connections on the one that doesn't. If it's shorting out anywhere it will stop your amp from powering that channel.

Failing that, it could just be that your amp has partly failed.

Feb 15, 2008 | Boss Riot 1500D Car Audio Amplifier

1 Answer

Channel 2 volume is very low

You can check if channel 2 is blown by switching around your RCA plugs. If you are using the speaker wires as high power inputs you can change them. I.E. swap the left channel with the right one. I assume you checked the gain control on the amp. If channel 2 works with channel 3's inputs then its your head unit or the wiring. If you are lazy take the amp to a car audio store and ask them to bench test it for you. Hack

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MTX 502 2 chanel amp Pre amp problem?

Unless your amp is 1 (one) ohm stable then you may have fried it. When you attach a 2 ohm load across a bridged amp then you have effectivly placed each output channel on a 1 ohm load. Not a good thing in most cases. Try hooking up ONE speaker on one channel and one input to that one channel one at a time. Then switch the speaker/input to the other channel and see if you can get either or both channels to work independently. Needless to say you must turn the amp off before you make ANY change in the wiring.

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The output stage of the amplifier (RH channel) was probabla damaged from the grounded cable. The heat in the speaker means that the coil (d^speaker) is recieveng DC power from the damaged amplifier. Audio amplifiers are not special and can be fixed. In many cases, the output stage is a power MOSFET or a power audio amp IC. The only issue is the availability of the parts in your area.

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One channel not working

could possible a bad bias resister. easy enough checked with a meter for ohm. also check around the circuit one the side that gets hot see if the transisters farther in are getting hot as well of if they seem out of range on a meter. One thing I have found is if you look carefully at an amplifier stage it is pretty bisymetrical. so use measurements from one side to compare to the other. Sometimes this will give clues.

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