I really wouldn't skimp out on the power/ground wires imo. Get good quality wire. KnuKoncepts I think is the name has really good amp kits with quality wire and fuses I got a 4ga kit with power, ground, RCAs, fuse, terminals for under 50 I think, and its nice and beefy while really flexible. Overkill for 500w rms but left room for upgrades.
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