I can't find specs on the amp but my guess is it should work fine with a 4 ohm load. They will likely be louder so you will have to dial up the volume on the sub to compensate. Just be careful not to overdrive them. If you push the volume to a point where it starts sounding shrill or distorted, you are over-driving the speakers and the amp and something is bound to go. Normally you will burn the speaker coils first. Explosions should sound like explosions. If they sound more like a whoopee cushion you've pushed too far.