Went through a few boxes till I found this set up.
Sub: Massive Audio Hippo84 $100
Amp:Alpine MRV-M500*paid $150 Amazon has it for $115 right now
Remote: Alpine 500RUXKNO2 $30
Box: Sound Ordnance Model BB8-35S $40
Wiring: Belva 4ga (BAK42) $22
Amp takes line level input from speakers and turns on by itself.
Here's some pictures:
Even used the factory ground