Hello. I have a passive subwoofer using 2 Dayton RSS210HO-8's in parallel, and I am looking for a cheap amplifier to power it. All filtering will be done through a Wiim Ultra, so I don't need any features, just power. Any recommendations? I have a Fosi ZA3 which outputs 235W mono 4 Ohm at 1% THD & 300W @ 10%, but I am looking for a bit more power than that. Preferably class d. Any suggestions? Thanks!