The Broughton Audio Always On High Pass Filter is an analog filter pedal that removes low frequencies below a chosen cutoff point. Broughton Audio describes it as "a standard Broughton high pass filter with the bypass switch removed": there is no footswitch and no bypass, because the pedal is designed to stay in the signal path at all times, quietly keeping sub-bass and low-end rumble out of the mix1.
What it does and how it is controlled
The pedal has one control. The knob sets the cutoff frequency and sweeps continuously from 25 Hz to 190 Hz, so a player can choose how much low end survives: a bassist might set it just below the low E to keep the fundamental but lose the mud, while a guitarist might set it higher to tighten the bottom of an overdriven tone. The filter rolls off at 12 dB per octave below the cutoff1.
Because there is no bypass switch, the pedal has no buffer stage to switch around. The stock input impedance is 1MΩ and the output impedance is 100Ω1.
Size and mounting
The compact enclosure measures 3.64" wide x 1.75" long x 1.06" tall. Broughton Audio says the design "allows a more compact layout, fitting on a single pedal board rail, or even mountable underneath a pedal board," which suits a set-and-forget filter that never needs to be reached during a gig1.
Power
| Specification | Value |
|---|---|
| Voltage | 9 to 24 volts DC |
| Current draw | approximately 10 mA |
| Connector | standard Boss style, center negative |
| Supply included | no |
The pedal accepts 9 to 24 volts DC and draws approximately 10 mA, so it fits easily on almost any pedalboard power supply. The DC supply should be a standard Boss style connector with center negative polarity. A power supply is not included1.
Related Broughton filters
Broughton Audio builds several other filters that add switching or extra bands to the same idea:
- Broughton Audio High Pass Filter, the switched version of this circuit
- Broughton Audio Low Pass Filter
- Broughton Audio Low + High Pass Filter
- Broughton Audio State Variable Filter
- Broughton Audio Filter FX Loop
Warranty and returns
Broughton Audio covers its products for one year to the original owner, with warranty repairs arranged by email. To return a product, the buyer emails within 7 days of receiving it, pays return shipping, and receives a refund minus the shipping cost once the pedal is received in new condition1.
Questions
Does the Always On High Pass Filter have a bypass switch?
No. Broughton Audio describes it as a standard Broughton high pass filter with the bypass switch removed, so the filtering is always in the signal path. That is the point of the design: it is meant to sit on a board or under it and clean up low end continuously rather than be switched in and out.
Is the Broughton Always On High Pass Filter analog?
Yes. The circuit is analog, and it is a 12 dB per octave low frequency filter. The single knob sets the cutoff frequency, sweeping continuously from 25 Hz to 190 Hz.
What is the filter slope?
The high pass filter rolls off low frequencies at 12 dB per octave, according to Broughton Audio. The knob sets where the roll-off starts, anywhere from 25 Hz to 190 Hz.
Does it come with a power supply?
No, a DC supply is not included. The pedal accepts 9 to 24 volts DC through a standard Boss style center negative connector and draws approximately 10 mA.
What is the warranty and return policy?
Broughton Audio covers its products for one year to the original owner, with warranty repairs handled by email. For returns, the buyer emails within 7 days of receiving the product, pays return shipping, and receives a refund minus the shipping cost once the pedal arrives in new condition.
How big is it?
It measures 3.64 inches wide by 1.75 inches long by 1.06 inches tall, a compact layout Broughton says fits on a single pedal board rail or can be mounted underneath a pedal board.
Sources (2)
- Always On High Pass Filter, Broughton Audio
- Always On High Pass Filter by Broughton Audio, RockBoard PedalPedia, 2026
