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The red light is a power protection circuit designed to shut the amplifier down due to an overload or wiring problem. If the amp was playing then shut off, my guess is a problem with the speakers or the speaker wiring. Some amplifiers are only stable to a certain load. For example, most car audio speakers are 4 ohms which is the resistance placed upon your amplifier to produce a certain volume of sound. If you bridge two 4 ohm speakers together in parallel, you cut the resistance in half, thus increasing the amount of power (and volume) to your speakers. This also creates more heat and could, in effect, shut your amplifier down. I would find out how the speakers are wired to determine the resistance of the load your amplifier is pushing.
It's rare that 2 channels will fail simultaneously, are you sending 4 signals to the amp or just 2?
If you are sending just 2, perhaps the problem lies before the amp in the cabling to it, or the output from the headunit. If you are sending 4 signals then there may be a fuse in the amp that drives 2 channels out of the 4. Of course this may be the case should you just be sending 2 signals.
An active crossover is needed if you plan to do a 2.1 or 4.1 or 5.1 setup.
Check if you have a subwoofer output from your head unit (most later models have). If there is, you might not need an active crossover anymore, but it depends on how you like the sound quality of the separations (low, mid, high). Please note the speaker polarities too.
try this it has worked for me in the past,..Contact Clarion by e-mail .Tell them your a student and learning electronics and in need of installation ,owners manual..ask if they can help and mail you info you need.Or try this link ..Its for a APA5241 could be very similar..http://www.clarion.com/us/en/MungoBlobs/720/1016/APA5241.pdf