Amplifier Issues

[odiepsock]

have a concept 4 channel amplifier and i am not sure what is wrong with it. It turns on, and plays at very low volumes, but when you try to turn it distorts, the protection cuts on, and the amplifier cuts off. I checked every one of the npn/pnp output transistors and every one tested to be good. Could this be in the power supply? It has 6 mosfets (IRFZ44N) on each side. Should i try to check these? Thanks for your help.

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[odiepsock]

I hooked up my ipod to the inputs and it was pushing a 4 ohm load on each of the speaker terminals

 

[odiepsock]

gain is on the right side, (opposite from the speaker and power input connections) and as i slowly turned it up, the protection light blinks as the bass hits. At this point you can hear distortion and if you turn the gain up more, the amp cuts off, cuts back on for a millisecond and cuts off again until you turn the gain back down.

 

[RandyJ 10+ year member]

There should be numbers on the nob. To the right should be a smaller number, and to the left should be a larger. What volume are you adjusting the gain at?

 

[RandyJ 10+ year member]

Also, what other settings do you have active right now. Bass boost maybe?

 

[odiepsock]

there are no numbers, but there are a total of 12 dots going in a circle around the gain, when i turn it past 2, it begins to clip. It also depends on the music. If i were to play somthing with virtually no bass, it could be turned up louder, but if it had heavy bass, it could barealy be turned up at all. DO you think this could be an issue in the power supply? Maybe a bas mosfet? I could upload a picture of the internals if needed. I do not have any other eaqulizers engaged. No bass boost, or treble boost. The crossover is set to all pass and i was only driving 2 channels, each to a 4 ohm sub. I tried this with only one speaker, and on channel 3 and 4 and it does the same thing.

 

[RandyJ 10+ year member]

Well, the thing is, if you are setting the gain too low then you could begin to severely distort the signal and cause the amp to go into protection real quick. What kind of source unit do you have?

 

[odiepsock]

I am using an ipod but should i try connecting it to my speakers and my alpine headunit in my car? I knw this works because i currently have a 4 channel amp hooked up