Apologies if this has been covered before, my searching couldn't find it. I bought one of those slim "under the seat" subwoofer units and have wired it up to the head unit and ground, no worries. However I am still looking at the best way to get the 12V power to it. The manual for the sub recommends running 8 gauge wire with 30A fuse direct to the battery but that seems a bit overkill to me. The sub is "1500 watt" but that is in fairytale numbers so I doubt it is going to require that sort of power feed. I had a poke around looking for convenient holes in the firewall anyway, but no joy. What is my best bet?