i've done some of the cheaper shallow mounts. pioneer, kicker, and kole audio. pioneers were ported in .65 each, tuned to 36(i think). kicker's were sealed in .5 each. kole audio's were ported (forget specs), and none of them were too bad. kole audio was the loudest of the 3, pioneer being second (they really have a difficult time playing too low), but i'm not sure the box was really that good for those kickers. i'd like to hear them ported. i was kinda surprised at the kole audios. correct me if i'm wrong, but i think they are power acoustik. they got loud and sounded ok. i'm in no way recommending any of these. i just had some input. personally, i'd rather do a good pair of 8's over any shallow mount.