FDeck HPF-Pre Series 3 Upright Double Bass High Pass Filter Preamp Phase Reverse | Reverb
Bassbone OD - Radial Engineering
What Is a Highpass Filter? When Should I Use it?
Why It's Perfectly Fine To Use A High-Pass Filter On Your Bass – Joey Sturgis Tones
Pigtronix Introduces the Resotron Analog Filter Pedal – No Treble
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
NPD - Broughton High-Pass Filter | TalkBass.com
variable HPF and LPF in a pedal? | TalkBass.com
Cali76 Compact Bass – Origin Effects
Tech 21 QStrip – Thomann United States
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
Origin Effects Cali76 Compact Bass '64 Black Panel