The following is based on the typical 50 percent Class AB efficiency. Having the Class G/H will help.
1000 watts can conservatively run up to 4 feet total with 4-gauge so that is 2 feet power and 2 feet ground from the power distribution blocks to the amplifier primary terminals.
The entire 2400 watts can run the entire distance (10 feet pos. and 10 feet neg.) with a 1-gauge supply and ground so that will be fine between the battery switch and the distribution blocks.
It might be easiest to maintain the existing supply wire and distribution blocks for the two highpass amplifiers (which still provides some room for future expansion) and run a new, dedicated and independently fused 2-gauge from the battery switch to the 1000 watt monoblock amplifier.
In any case, the cables between the batteries and battery switch should be 1-gauge now with the larger power.
David
Earmark Marine
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