just installed 2 sets of the focals in my friends car like a few hours ago, only off of pioneer HU for now, really like them, sound good and get decently loud off the low power.
iv seen 2 CVR 15s on 1500 do a 145 on music in a jeep, sealed on dash with TL.
but that was ported and i think it was prefab, so probably tuned higher.