I had 2 of these in a sealed box for about one month running on a Power Acoustik OVN1-4000D they were pretty loud but they were not getting the 1000rms each ther suppose.to handle. So I bought a Hifonics Brutus 2000d which actually produces true 2000w at 1 ohm off C******* and these subs blew in under 5 mins. They are extremely overrated and should only be given about 700rms each Max .