BROUGHTON AUDIO HPF = 12 dB per octave low frequency filter. The knob controls the cutoff frequency and ranges continuously from 25 Hz to 190 Hz.
=> smoothest and musical
SINE EFFECT HPF = 24 dB per octave low frequency filter. The knob controls the cutoff frequency and ranges continuously from 25 Hz to 400 Hz.
=> compromise ?
SFX SOUND THUMPINATOR = 36 dB per octave low frequency filter. The cutoff frequency is fixed at 25 Hz + buffer.
=> effective cutoff + buffer
Usage depends on where you place the filter in the signal chain, at the very beginning/end of the signal path, just like an EQ, to help the gear, before/after an octaver, to remove muddiness, to protect the speakers, to remove the sub bass as it only adds unnecessary energy to the total sound...
The Thumpinator is good but it would be even better with the cutoff frequency fixed at 35/40 Hz and personally, I prefer to have an HPF filter at the end of the signal path...
Afterwards, everything that happens after the HPF filter can generate new unwanted low/sub frequencies, most amps and speakers are designed to receive a wide range of frequencies and often, they already cut below 30/40 Hz, most sound systems/PA/FOH already have EQ and filters...
May the Groove be with you.