I used a Audio Dynamics IDQ 8" V.4 Subwoofer in the stock Bose enclosure with a Rockford Fosgate PBR300x1 Amp and a PAC AP4-GM61 to get a low level signal from the factory amp without the muffled bass at higher volumes.
Sent from my Pixel 2 XL using Tapatalk

Sent from my Pixel 2 XL using Tapatalk