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Re: how to switch protection off (red LED to blue)
The protection light is on indicating a short or over- voltage problem. If you disconnect the speaker leads and the light goes off or green then the problem is a shorted speaker or wiring problem. If the light stays red the problem is inside the amp and it will need service and parts.
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Devices with several light emitting indicators would each display as observation of manufacturers installed features. Red indication is power cciuit indication, yelow as alternate warning where green is indication of regular fucntionality. Once the device is least malfunct, every light is an equal expectation. Usually with amplifeiers, the red light has to be on throughout until stereo became powered on to porduce green light effects as radio expectations.
It's most likely that the over-current protection is tripping at high power. At lower voltage, the amplifier can't produce as much output power and therefore can't produce enough current to trip the protection circuit.
You need to check your speakers to make sure that they are not shorted. With an ohm meter, the resistance across the voice coil shouldn't read any less than ~90% of the rated impedance.
If the speakers and the wiring are OK, the amp may have an internal fault causing the amp to go into protection.
It's likely that there are shorted output transistors in at least one channel. If you want to repair it yourself, you'd have to determine which transistors are defective and replace them. The following page will help guide you through the basic troubleshooting.
well at this point i would say it is both,, the subs fried because your amplifier passed dc [direct current] and fried the voice coils on your subs....return them if they are under warranty,, the amplifier sound like you either operated it beyound its specifications or it has a defective output stage allowing it to pass or leak dc....it turned the voice coils into the equivelent of the runners in a toaster oven....when an amp passes dc it is going to do so to whatever speakers you hook to it....so either bring it to a shop to be fixed/ return it to place purchase for exchange or throw it away.....or you will continue to experience the same problems....I am sorry..ps the amp goes into protection when it detects a short...[ the short is produced by the amp and it is detecting its own fault and putting it in to protection after it BURNS up your drivers....