Rockford Fosgate Power Stage 1 T115D4 Review
Rockford Fosgate Power Stage 1 T115D4 car subwoofer review. The new Power Stage 1 T115D4 is just a beast of a 15″ subwoofer. A lot of people have been asking for reviews of Rockford Fosgate and I decided that the Rockford Fosgate Power Stage 1 T115D4 would be a great start. This sub slams, very hard. A lot of reviews that I have read online agree as well.