I bought a single sub. put it in a 1.124 cu.ft box tuned to 37hz. had it hooked up to a Profile AP1200 pushing 200w x 2 @ 4ohms well below the rms listed. got a total of 1 hour play on it. SPL was not too hot. It was similar to my kicker comp 12". Went on a 2 week vacation, came back took my car up the street 10 minutes into the drive the speaker just stopped working. If i push in on the cone it vibrates, so needless to say not a good sub imo since it died pushing 2/3 the rms it is rated to handle.