SMALL FI 4 BASS CUT LO FIDELITY EFFECT PEDAL PASSIVE EQ HIGH PASS FILTER LOW | eBay
Tech 21 QStrip – Thomann United States
Variable 20Hz...200Hz Hi Pass / Low Cut Filter - freestompboxes.org
variable HPF and LPF in a pedal? | TalkBass.com
variable HPF and LPF in a pedal? | TalkBass.com
NPD - Broughton High-Pass Filter | TalkBass.com
NPD - Broughton Low + High Pass Filter. Does a great job of cleaning up muddy low end and hissy high end frequencies I don't want. Just the creamy middle! : r/BassGuitar
Pigtronix Introduces the Resotron Analog Filter Pedal – No Treble
Other/unknown BROUGHTON Low + High Pass Filter - Pedal on ModularGrid
Origin Effects Cali76 Compact Bass '64 Black Panel
Bass Guitars And High Pass Filters – FuelRocks
Low + High Pass Filter | Broughton Audio
Tech 21 Q-Strip EQ and Preamp Pedal Direct Box with 4-band EQ, LPF and HPF, XLR Output and 9V Phantom Power - Zorro Sounds