First, you need to know how far the battery is from the amplifier. In DC power systems, size IS important. The further the distance, the more power will be lost in a cable of the same size.
I use #6 wire for both the Positive and Negative terminals for powering a 100A continuous draw over about a 15 foot run. The wire does get a bit warm, so it is probably a bit small for the service I am using it in, which isn't critical. You may need to use #4 wire, but I doubt it. Audio amplifiers have a low continuous power draw, compared to my application, and although I have seen some fused at over 100A, the chances are that this is on ly in case the amplifier shorts internally. I doubt if the amplifer fused at this level has ever drawn more than 50% of this rating.
#6 wire can be purchased from a welding supply or automotive store. A typical price is about $1.29 per foot. Get crimp on connectors for the cable, don't try to actually attach the stranded wire to ANYTHING. You'll just have problems. Also, ask the store if they can actually crimp the connectors to the cable for you, although you would need to have the exact measurements for the cable. Remenmber, any excess wire length is a loss of of power X2, as you have 2 wires to contend with. DON'T count on the vehicle chassis ground to supply a good negative ground. Run both the POSITIVE and NEGATIVE wires striaht to the battery. It is also important to put a fuse (100 or 150A) at the battery POSTIVE terminal to prevent the possibility of an electrical fire if the positive lead gets cut and shorts to the chassis.
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