just a heads up dude, mark from mach 5 is out of 4 ohm recones (as far as i know). i wanted a 4ohm recone, to build one from parts i acquired, myself but all he has are 8s. im doing a single mj18 so it will still work out great but wont see as much power. Just got my recone in last week. So I hope this isnt true. Really want to find a working sub anyway. Thanks for the heads up though.