ive had these subs for less than 6 months....... they were in a guys car that works at divine sounds........ the box/subs hit 153 dbs in a pt cruiser the week before i bought them.......... they absolutely slam, they are special built square 10's. they were built for amla gates.... who owned the kicker competition bronco that had 48 of the exact speakers that i have............ subs retailed for 1,000 each when produced, and only 100 were made