Audio Systems: HU, alpine type r subs, deep cycle battery

Question
I currently have a Panasonic CQ-C7103U deck and an Kenwood Excelon KAC-X812D amp with 2 12" Alpine type R subs. when the bass goes up too high the deck cuts out because it can't handle the power. I'm looking at getting a new deck but i don't know what spec i should be looking at to cancel out this problem, either Watts or Pre-Amp output voltage or something else. If your could let me know that would be MUCH appreciated.

Answer
The deck isn't the problem, it's your electrical system. That amp is demanding too much power.

If your total system power is 800 watts RMS or more,  you will need to:

1. Upgrade to a heavy duty deep cycle battery
2. Upgrade the "Big 3" - that is to replace (or add to) the power wire between the battery and alternator, the ground from the battery to the chassis and the ground strap from the engine/tranny to the chassis with at least 1/0 AWG wire.

If your total system power is 1000 watts RMS or more,  you will need to:

1. Upgrade the alternator to a high output alternator
2. Upgrade to a heavy duty deep cycle battery
3. Upgrade the "Big 3"

Failure to do this will result in you replacing them anyway as the alternator will eventually fail.

Here is a guide that will calculate what size alternator and power wires you need  http://www.datafilehost.com/download.php?file=6d26c621

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A second battery is never a good idea as it's an added strain on the alternator to charge two batteries AND supply power for the car. The ONLY time a second battery is useful is if the audio system is to be used with the car off.

A cap is only good so far as the audio system isn't trying to pull too much from the electrical system. A cap doesn't provide more power, it's designed to 'stiffen' the voltage to the amp, nothing esle. If the current isn't there, a cap won't help. The alternator must have at least 20% more amperage power than the entire vehicle and sound system combined for a cap to be of benefit which is ironically the same requirements for an amp to be efficient.

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