Im planning on putting a mj 18 in a 5 ft^3 ported box tuned to 30 hz. The sub would be running of a infinity amp gettin about 400 rms at 4 ohms. Anyone know if this setup would thump? Looking to get rid of my old 10w0's and move onto a bigger sub.

It won't kill you with only 400w. But it should sound decent.

Great sounding driver, blends well with front stage, awesome cone size per dollar.