Do I need a specific type of 4 gauge wire for my monoblock amp?

To handle a 150 amp load youwill need a awg-1 gauge 
in a copper wire ,justlook up the awg wire index for 
150 amps and wire size requirement . Something does not sound right ,this is not for a home ,  even on big power amps 
they use only a 20 amp circuit .i owneda Audio store In the UK
and into Audio over 30 years . Something is not right ,
thereos no home amplifier higher then a 15  maybe 20 amp fuse .
you need to tell us what model brand  and age 
call JBL . If this isaindustrial Amplifier for a outdoor concert 
that is a whole different ball game.

This is for a class D monoblock subwoofer amplifier. Crutchfield said I should use one that's at least 120 amp.

The fuse goes between the battery and the amp itself.

Class d amps have a higher output than most other class a or a/b amps.

Go to a professional installer and save yourself the angina!

Crutchfield sells a wiring kit for $70 that has 4 gauge wire and a fuse.

Best

JD

Thanks for all the advice. I ordered a good copper wiring kit.
 I might get a stiffening cap for it too.
This is for a jbl bp1200.1 (car audio mono amp) *not home audio.

Ill be hooking it up this week. 
Thanks for the advice everyone.