I am running my tealthbox with a USAcoustics amp...EXCELLENT. they dont get near enough credit for their quality. they just dont sponser a ton of weenies in hondas....but i have a friend with a PPI, and i dont hear a differecne...mine might even be better. I have the email address of the manufactirer of USAcoustiucs..the owner fo that plant...and i have asled him questions several times...always the right answers! Shoot me an email if you want his email address.