My 05 Xterra flat wall. 4 DC Audio custom M1 lvl 6 18s. Tuned low-ish and an absolute demo machine but has still been 160dB@37hz Termlab certified on 20kw : r/CarAV
IWS-10 | Subwoofer | Monitor Audio
Protege IWS105 In-Wall Subwoofer | Proficient
Solid Drive Dual 10" In-Wall Subwoofer IW210 B&H Photo Video
What do u mean by 'wall' ?? | DiyMobileAudio.com Car Stereo Forum