well the only ons i know of are by kicker and they suck. they blow VERY easy and sound horrible. although they do get VERY loud. good for spl buyt horrible for everything else. ide stay away
yea i have to 15" kicker l7's and they get loud pretty loud, then again i have em hooked up to a 3200w SPL amp and im sure my stock electrical system doesnt feed them all 3200W's
ive had both the hifonics and kicker and they have horrible sq but get really loud so they suck for everything except SPL but dont ask for help with square woofers on here because no one likes square woofers around here