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 Five 200 amp, Chase SS 18.2(2), VS 18.1(2), Samsung BDP F 7500, Asus/My Book Live HPC 4 TB
Yaquin VK 2100 amp, McIntosh XR 5 speakers, Samsung BDP F 7500