Probably the most impressive was 146 @ 32hz iirc, music. 1 ssx 12 on an rd3250.
Also on 2 ssx12 and cactus pf600.1 I believe did around 147/148.
Same car got up to 149 on 3 sa12 on 2 saz3k.
That was my gf's cousins teg.
Mine did 141 @34 on a Hertz Hi Energy 12 and an os kicker zr240.
Never metered my xcon on dd m3. It peaked around 30 and was likely in 145 range.
All of our #s were between 30-34hz, headrest.