Hello, i just got my TX 350 Lux and got the factory sub replaced with Kicker 8" and added a 2nd sub (Kicker 12" Compaq series)..both are connected to separate amps. what i figures was the ANC was interfering with the new Sub..i hear hum when music is not played. the technician disconnected the ANC which increased outside noise. did you encounter something like this? how were you able to achieve your 8" hit hard as my Kicker 8" gain had to be decreased to lower the interference with ANC. any guidance will be helpful. thanks in advance.