Can I get away with this for 1500 watts?

[n2audio 5,000+ posts]

Here is something better:
This table shows the amount of current flow which will cause a 1/2 volt (0.50) drop in a 15 foot run of cable. Many people consider 1/2 volt to be the maximum acceptable voltage loss in a system's main power wire. The 'total amp power' A.K.A. total RMS power output of all of the amplifiers combined. It is based on 60% efficiency and a battery voltage of 13.8 volts.

wire: current flow: total amp power: RMS power

0 awg 334 amps 2763 watts

4 awg 132 amps 1096 watts

That's for Class A/B, and the updated version has

0 ga 330A 2731W

4 ga 131A 1084W

Class D lists:

0ga 330A 3414W

4ga 131A 1355W

I wouldn't fuse 4 ga higher than 125A.