i have 2 jl 12 w3 in a sealed box and im using an mtx 500d to run them. i would definatly use more power than recommended on the spec sheet. ive talked to jl a couple of times to get an idea on what rms power these can take and they have all been from 350-500 watts rms. they said that they would not reccomend running the upper end in anything but a sealed enclosure. they sound very good and have really good cone excursion.
