AMPLIFIER OVERHEATING AND SHUTTING DOWN
The most common cause for this problem is when amplifiers are overloaded with speaker impedances lower than what they are rated for.
AMPLIFIER GOING INTO PROTECTION
When an amplifier goes into protection mode, we have to first establish whether the problem lies with the amplifier, or whether it is something in the installation. Disconnect all RCA and speaker cables, leaving the power, ground and remote connections. Turn the system on, and if the amplifier now powers up properly, add the RCA cables, and see if the amplifier goes into protection. If not, proceed by reconnecting the speaker leads etc. By following this simple process of elimination, the fault can be diagnosed quite easily.
LACK OF BASS
The lack of bass can be attributed to various causes.
Check that the proper recommended enclosures have been used for the woofers.
Check the phasing of multiple woofers connected to one amplifier, as well as those connected to multiple amplifiers. If the positive and negative terminals are reversed in a two woofer systems, you will get a cancellation which sounds like a lack of bass. Always double check your wiring for proper phase.
Position of woofer enclosures in the vehicle will also affect bass output. You should experiment with different box positions, firing forward, backward or upwards to see which way you get more bass in to the cabin.
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