are they they dvc's or svc's, b/c if you do put them in parrallel at both the coils and than at the amp than your gonna have a 1ohm load. i'm big on the 4ohm for sq. so your options are 4ohms in series at the coils and parrallel at the amp or 1ohm parrallel at both the amp and coils. or 8ohms or 2ohms with the a svc.

but i think your main problem is the jensen amp :eh: its not that realible of a power souce so it could be flaking out on you. i've matched them to a kicker amp in a customers car and it sounded nice. i'm thinking about going with that setup with an polk momo amp.