x2. I didn't know the amp had such a large fuse rating - you'll have to make sure the 4ga you get is at least TRUE 4ga - oversized 4ga would be even better. Make sure it's OFC as well, not CCA (so the fleks, not the KLMX as stated).Just an fyi, that amp is fused for 150 amps of current and the Knu KLMX wire is only rated for 100 amps. You'd have to get the Fleks wire.