Get a Crown, or Berhinger external amp for the sub. This way you don't have to get rid of the sub/s. Look into some Chase Home Theater subs. I still have an Epik that is trouble free but went with some Chase subs which are phenomenal and at a good price.
Klipsch RF 7 based HT 7.4, Pioneer SC 35, Acurus 200 Five, Dayton 18 Ultimxa Dual Sub Cab(2), Dayton 18 Ultimax Large Vented Sub Cab (2), on Berhinger I Nuke DPS amps, Samsung BDP F 7500, Asus/My Book Live HPC 4 TB
Yaquin VK 2100 amp, McIntosh XR 5 speakers, Samsung BDP F 7500