Hey YAY....well I have been absent for a few days...working nightshift takes it out of you.....so I will still answer your questions
the amp wiring kit I got was a Scosche and I got it at wal-mart...I just got the amp wiring kit that was for a 300 Watt amp....had all I needed.....you can always change out the fuses to the size you want....not to mention...the alpine amp has a fuse right in the side if it too.
the speaker wires....all I did was use the wiring that came with my new speakers as there was more than enough to run from the dash to the amp and back.....that 9 wire flat wire would be cool though....keep it pretty neat.
as for the wire to the sub...I used 12 ga.
the amp wiring kit I got was a Scosche and I got it at wal-mart...I just got the amp wiring kit that was for a 300 Watt amp....had all I needed.....you can always change out the fuses to the size you want....not to mention...the alpine amp has a fuse right in the side if it too.
the speaker wires....all I did was use the wiring that came with my new speakers as there was more than enough to run from the dash to the amp and back.....that 9 wire flat wire would be cool though....keep it pretty neat.
as for the wire to the sub...I used 12 ga.