Your mains probably have better bass than that piece of crap. I'd throw it in the trash and just use the bass in the mains. The marantz won't get wrecked from hooking it up to crap, but it's kinda pointless. Just wait til you can afford a real $500+ subwoofer, and until then enjoy the bass your huge mains provide!! If you want to try it out, go ahead, but my guess is that you're better off hearing less bass, than the distorted, bloated bass those tiny HTIB subs tend to provide.