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Get a very high farad capacitor and install it in parallel with your battery.
A capacitor is a piece of electronic equipment that charges energy for storage and releases that energy when you need it - like a battery only it charges in about 1 second and releases energy with utmost force. They come in many sizes, as small as 1mm to sizes larger than car batteries. What you need is something about the size of a thermos, but bigger is always better as far as caps go for sound systems. This should be 1 farad at least. Running parallel means to connect the + of the battery to the + of the cap and the - of the battery to the - of the cap.
What will happen is the cap will charge up using the battery's power in about 1 second, and hold the charge until a power demand comes - your subs. When the subs hit that kickdrum, it will draw the power from the cap, draining the cap and not your primary power source - the battery. Then the battery will charge up the cap to prepare it for the next major draw.
The cap allows the power draw from the battery to be much more gradual instead of the intense load of the subs directly.
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