A lot of people hardcore into car audio nowadays always seem to say "squares are bad, they sound like crap, theyre over priced" etc etc. well i have four of these powered by a sundown saz 3500 and let me tell you they do not sound like crap, ported box tuned to 30. the sundown wired to .5ohm puts out 4k plus rms with proper electrical and i have proper electrical. im not cranking my gain/bass boost by any means but these things can take a beating. one thing is they love huge boxes. 4-5 cubes per sub 14-16 inches of port area per sub. thats when they really start to shine. my box is 23 cubes before port/sub/bracing displacement with 250 square inches of port. true there are lower priced subs out there that are equivalent in performance but these are very good subs. plus kicker has awesome customer service and warranty :D i cant give five stars for everything because i havent had them long enough to tell. one bad thing is that the terminals are a bit small for 2 12awg wires (wiring parallel/parallel)