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Can't get power from amp

My problem is i have a 4 channel amp and i want to use 2 channels i get the amp to light up but there is no sound or the vu meters won't light up help!

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Re: can't get power from amp - Car Amplifiers

Please quote make and model of amp.

Posted on Nov 10, 2007

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I have an alpine mrv-f307 4/3/2 channel. I have it hooked up to 2 12in Kenwood subs. Right now standard 2 channel each sub having their own. I heard doing a series hook up and bridging the subs to the amp ...

Bridging an amplifier refers to combining the power of two channels to run one speaker at higher power. If it is wired correctly, your amplifier is running with 4 channels bridged into 2 speakers now.

Mar 11, 2015 | Kenwood Car Amplifiers

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How to wire a crossfire vr602 2 channel amp at 4ohm and 2ohm

I would be more worried about the amp than the speakers, those subs should handle the watts with no problem. The problem will be in the amps ability to remain working with a bridged 2 ohm load. It may not even stay on without going into protect mode with a 2 ohm load. If it does stay on then it may get really hot and shut off from the heat off of the Mosfett Transistors, or it could burn the Mosfetts from driving them too hard. Basically it's your choice, run your amp hard and gain more volume or run it with slightly less sound and have a cleaner sounding more stable amp that will stay on and have less chance of being damaged. If it's not loud enough the best thing to do is buy a different amp that better suits your needs and fits the application. In your case a 2 ohm stable Mono amp is going to be your best bet or a 4 channel amp bridged into 2 channels and run with 4 ohms on each channel. Or another exact matching amp like your 2 channel amp bridge them both and have each powering 1 of your 4 ohm subs. I used two VR mono amps to power my two 12" 4 ohm subs for a few years

Apr 03, 2013 | Crossfire VR602 Car Audio Amplifier

1 Answer

300W Pyramid PA305 protection light

What is the speaker load in Ohms that you are running? Or what exactly is hooked up to it? are you bridging it? The protection light will come on if the load is too much for the amp to handel. If the load (in Ohms) is less than the rated load that it can run, it will stop the output to keep the amp from self destructing. The amp will sense that the demand for power will be too high for the amps circuitry which will either make the amp get so hot that it will burn up the copper on the board or more likely burn up the power mosfetts that power the speakers. If the Ohms are within range then it will allow power to flow through the circuit until the rails that the mosfetts are bound to until they get so hot that it will go into thermal protection. So if your amp has both thermal and overload protection lights and the overload is light then the load is probably too much for the amp. if it's bridged in mono the you can only have 1 speaker setup hooked up it if it's a 2 channel amp. a 4 channel amp bridged in mono for both front and rear channels will be able to have 2 speakers rated a 4 ohms each hooked up to the amp 1 set per bridged output or channel.
Try it running in stereo with only 1 speaker per channel and see if it will produce sound. If not then you have an amp that has internal problems and will need to be serviced. Check your warranty to see if you are covered.

Apr 02, 2013 | Pyramid PA305 150 Watt PA Amplifier Car...

1 Answer

How can you bridge a 2 channel 300 watt amp to a 4 channel 300 watt car amp?

if you have (4) 4 ohm speakers (No Subs), then you simply take the (2) positives from the two right speakers, and the (2) negatives together and put them on the right output of the amp. Do the same for the other side. This will have the amp at a 2 ohm stereo load on each side, which will max out the power of the amp. Will sound great with any small power amp.

Sep 07, 2011 | Car Amplifiers

2 Answers


From the specs this amp can only handle 4ohms when bridged but can handle 2ohms when it's not bridged

  • Continuous Power (20Hz-20kHz, 0.04% THD)
    • 2 ch: (4 Ohm) 100Wx2
    • 2 ch: (2 Ohm) 200Wx2
    • 1 ch: (4 Ohm) 400Wx1
  • Maximum Power (EIAJ)
    • 2 ch: (4 Ohm) 250Wx2
    • 1 ch: (4 Ohm) 750Wx1
  • Frequency Response: 10Hz - 50kHz (0,-1dB)
  • Total Harmonic Distortion: <0.01% (1kHz, 4 Ohm)
  • Signal-to-Noise Ratio: >105dB (IHF-A Weighted, at 1kHz)
  • Dimensions: 10-3/8" x 2-1/2" x 13-5/8"
Hope that helps.

Nov 08, 2010 | Pioneer PRS-X720 Car Audio Amplifier

1 Answer

My amp and subs work but the subs dont sound very loud. how do i adjust my Pyle PLA4340 amp and fix this problem

Hello polarisracin,

You need to bridge 2 of the amp channels to each 4 ohm sub to get the most power from the amp. Bridge channels 1/2 to one of the subs and channels 3/4 to the other one. But the amp is only rated for 75 watts RMS per channel and Pyle products are sometimes rated higher than their real capabilities. So, even bridged and with the rated output, you'll only be getting at most 150 watts from a pair of bridged channels. That's not much for a sub.

Hope this helps.

Oct 01, 2009 | Pyle PLA4340 Car Audio Amplifier

1 Answer

Soon as i turn on my QSC RMX2450 the clip light comes on for Ch 2

Sounds like an output going bad. Try to get some electronic contact cleaner and spraying on the circuit board. If its corroded this will help clean the circuit..

Sep 07, 2009 | QSC RMX-2450 Car Audio Amplifier

1 Answer

Thumping speakers - no power light is on - wired correctly

the amp is going into protect mode due to something wrong in the amp or some thing in the wiring to it ooh yea if you are getting 18v power to the amp that is way to high it should not be higher then 15v if the amp is in protect mode it will not play at all.

Nov 02, 2008 | Visonik Dual Bass Box with Amplifier Car...

1 Answer

Amp Power light will not go on. Protection light is lit- Thump sound in speakers

It probably has shorted output transistors. To eliminate other possible causes, read through the following page.

Amplifier in Protect Mode - Troubleshooting

Let me know if you have any other questions.

Oct 31, 2008 | Visonik Dual Bass Box with Amplifier Car...

1 Answer

Multipal amps

make sure your speakers are connected correctly if subs and are inside the box then check connections also at times the rca at the back of the head unit can disconnect. if power light is on then error is either speakers not connected correctly, rca faulty or not connected or speaker output on amp is blown

Jan 03, 2008 | Kenwood KAC-7202 Car Audio Amplifier

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