Piezo Buffer for high impedance transducers, with Low cut filter.
This compact, always-on buffer features a 10MΩ input impedance and a variable high-pass filter (HPF) adjustable from 200Hz to 20Hz, which can be bypassed via footswitch. The buffer’s very high input impedance makes it ideal for piezo pickups that require proper loading to maintain full frequency response and natural tone when connected to amplifiers or pedals.
The active variable HPF, positioned after the buffer, lets you choose a cutoff frequency anywhere between 200Hz and 20Hz using the control knob. With a 12 dB/octave slope, it’s ideal for removing unwanted low-end frequencies that can cause feedback, boominess, or excessive sub-bass. It will work equally well with other active or passive instruments, as well as pedals, preamps, or in FX loops.
The foot-switch gives you the option to toggle the HPF in and out of the signal path in real time, allowing direct comparison between the filtered and unfiltered sound. The buffer always remains active, so your tone stays consistent.
The active variable HPF, positioned after the buffer, lets you choose a cutoff frequency anywhere between 200Hz and 20Hz using the control knob. With a 12 dB/octave slope, it’s ideal for removing unwanted low-end frequencies that can cause feedback, boominess, or excessive sub-bass. It will work equally well with other active or passive instruments, as well as pedals, preamps, or in FX loops.
The foot-switch gives you the option to toggle the HPF in and out of the signal path in real time, allowing direct comparison between the filtered and unfiltered sound. The buffer always remains active, so your tone stays consistent.
> When & why you need It?
Piezo transducers can sound thin, harsh, or boomy when plugged directly into an amp or pedal due to impedance mismatch. This custom buffer provides the correct 10MΩ load, ensuring your pickup delivers its full tonal range—clear highs, balanced mids, and tight, natural lows.
Then, the HPF lets you tame unwanted sub-bass and boominess, tightening the sound and reducing stage feedback.
> Quick-start
Piezo transducers can sound thin, harsh, or boomy when plugged directly into an amp or pedal due to impedance mismatch. This custom buffer provides the correct 10MΩ load, ensuring your pickup delivers its full tonal range—clear highs, balanced mids, and tight, natural lows.
Then, the HPF lets you tame unwanted sub-bass and boominess, tightening the sound and reducing stage feedback.
> Quick-start
- Typical Setup: Instrument → [Buffer + HPF]→ Amp / Preamp / Effects Chain
With the knob you can dial in just the right amount of low-end control.
- Start with the HPF around 12 o’clock, then adjust by ear to control feedback and tighten the low end.
- For upright bass, try 9–12 o’clock (≈150–100 Hz) to reduce boom, or 1–3 o’clock (≈60–40 Hz) to clean up stage rumble.
The above suggestions are only starting points and not rules that apply everywhere and always. The ideal setting each time depends on your pickup, instrument, amp, venue, volume, etc.
- Always make sure to check your amplifier’s EQ first.
- Start with the HPF around 12 o’clock, then adjust by ear to control feedback and tighten the low end.
- For upright bass, try 9–12 o’clock (≈150–100 Hz) to reduce boom, or 1–3 o’clock (≈60–40 Hz) to clean up stage rumble.
The above suggestions are only starting points and not rules that apply everywhere and always. The ideal setting each time depends on your pickup, instrument, amp, venue, volume, etc.
- Always make sure to check your amplifier’s EQ first.
Specifications:
▹ Input impedance: 10Mohm
▹ Output Impedance: 100ohm
▹ Voltage Required: DC 9-24 Volt (Use 12-24V if you need more headroom)
▹ Polarity: Negative tip
▹ Current draw: 7mA @ 9V
▹ Aluminum Enclosure, dimensions: 122 x 66 x 39.5mm [4.8 x 2.6 x 1.57in]
▹ Weight: ~250gr.
▹ Input impedance: 10Mohm
▹ Output Impedance: 100ohm
▹ Voltage Required: DC 9-24 Volt (Use 12-24V if you need more headroom)
▹ Polarity: Negative tip
▹ Current draw: 7mA @ 9V
▹ Aluminum Enclosure, dimensions: 122 x 66 x 39.5mm [4.8 x 2.6 x 1.57in]
▹ Weight: ~250gr.
This device can be built according to your own custom specifications. Contact us.
