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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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  • rcclint Nov 05, 2007

    need help fast



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  • 94 Answers

Please quote make and model of amp.

Posted on Nov 10, 2007


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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.

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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.

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Hello. I have one (1) XS-L1035 being powered by a JBL gts 180X 2/1 channel amp. The sub works fine if i power two(2) subs thru 2 channels BUT if I try to bridge the power to one sub the amp cuts out. Is it...

It sounds like the problem is with the amp. try using the other sub in bridged mode and see if it still turns it off. If it still turns off then its definitely the amp. In 2 channel mode you are using each channel at 4 ohms right? and in bridged mode to 1 speaker it should be throwing a ton of power on a 4 ohm load as well,it should work fine bro -its gotta be the amp

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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.

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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.

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With a single 4-ohm subwoofer, usually the best choice is a 2-channel amp that can be bridged to a single channel. In your case, the sub is rated for 1000 watts. Not many amps are rated for that kind of continuous power into a 4-ohm load. Kicker doesn't list a minimum power rating, which isn't unusual in subwoofer specs. Depending on your budget, I'd look for an amp rated for 300-500 watts minimum; the higher, the better, up to 1000 watts. Most amps will have several power ratings, based on the load impedance and number of channels driven. A typical 2-channel amp might be rated like this: 150 watts x 2 channels at 4 ohms 300 watts x 2 channels at 2 ohms 500 watts x 1 channel at 4 ohms. The power rating you'll want to look at will be the 1-channel, 4-ohm rating. You can look at mono amps, too, but in the power ranges you're looking for, a 2-channel amp will probably give you the best value. However, if you can find a mono amp with a high enough 4-ohm power rating, it would run cooler and might last longer than a 2-channel amp with comparable power. When looking at mono amps, you'll find their highest power output will be at 2 ohms or 1 ohm; make sure you're checking the 4-ohm rating when making comparisons. Some amplifiers that might work well for you: Kicker SX900.2 Kicker ZX850.2 Alpine PDX-1.1000 Rockford T600-2 Hifonics ZXi 1006 Premier PRS-D2100T Power Acoustik OV2-2200

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