Re: Got Bass?
I am not sure a roller rink (or most systems setup/tuned for most forms of music (live or not live)) is interested in "accurately" reproducing music. 
~:-D~:grin:
As an aside, the DBX 120A (or if mixing ITB something similar to Waves LoAir) is also used a ton in rerecording engineer's LFE signal chains for movie mixes.
Bass expanders do not add massive THD to a signal per se...... remember that because of the way our ears work we need much more amplitude at low frequencies to perceive them to be the same apparent volume as mid/high frequencies.
The frequencies subharmonic synthesizers are generating are often very low (e.g. 22hz) and the amplitude needed for a playback system to make those signals audible can very quickly eat up all your headroom before you even start to hear them (if the frequencies are not being filtered out by the speaker). The corresponding clipping from bad gain structure is what will cause audible distortion in the pass band.
A little subharmonic synthesis can go a long way, and you can very easily get yourself in trouble.
