Omg this again [emoji848]..
Lets slowly go into basics here..
How about i list some points to cut this post down...
1. Amplifiers are not efficient so cannot be easily calculated for voltage/ampacity
2. Different wires can meet or exceed NEC standards (welding wire to be specific)
3. Battery size and CCA can break NEC standards.
4. Doubling up on same size wire is not mentioned in NEC standards.
5. Distribution blocks break ampacity limits due to metals used.
6. Subwoofers do not all use same specifications.
Oh god i rather not keep listing, so the comment of +/- is very considerable on top of buying extra wire is needed.
We are not running transformers in our vehicles that isolate a certain amperage so no matter what! The ampacity and limits will fluctuate in a vehicle.
This is all covered in MECP classes, not electrician classes that deal with regulated power on a open/closed electrical grid.
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