I have not heard of "The Bass Gang" and I must get their CD's (I used to live in Parma near where all these guys are from). I would totally agree with you that the bass response on those speakers is extremely realistic. Accurate timbre is where they excel. I am not so sure it is amp damping - probably mostly related to driver and cabinet design: short coil in long gap, large well cooled driver motor in a critically damped acoustic suspension - you are hearing most bass notes with less than 1% harmonic distortion - a rare thing in a speaker these days )
Please share with us your other favorite recordings. I find so many gems from tips that I get from A'goners.