Rockford Fosgate and PPI are shells of their former selves. Neither has made a good amp in 10 years. JMO, YMMV.
Well that is going out on a limb saying that cause PPI built some real kick azz shit and I had it in my old ride when they had the 600.2 amp that thing rocked the house I had that running three 10w6s in my old k5 nothing in town could touch it.