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904B Voltage Controlled High Pass Filter Eurorack Module

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Analog high-pass VCF synth module for Eurorack

The Behringer 904B voltage-controlled high-pass filter module brings the warm, rich tone of a legendary analog filter to your Eurorack setup. With the 904B, you can accentuate high frequencies while attenuating lower ones to cut through the mix or create ear-catching lead tones. Dial in the fixed control voltage to determine the cutoff point, then switch between low and high frequency ranges to hone the effect.

Shape Your Sound With Three Control Voltage Inputs

Plug control voltage sources into the three inputs to modulate the 904B's cutoff frequency in real time. Let an envelope generator or low-frequency oscillator sweep the cutoff back and forth, opening and closing the filter for rhythmic effects. You can also patch the 904B to a keyboard to have the cutoff track your playing. The hands-on control voltage modulation options add motion and interest to sounds.

Experience Legendary Analog Warmth

The 904B accurately recreates the fat, rich tone of an iconic analog high pass filter from the 1970s. The authentic circuit design imparts vintage character with a smooth, musical sound. Whether you're looking for a subtle sheen or an aggressive bite, the 904B delivers the creamy analog warmth and presence that only comes from genuine analog circuitry.

Mix and Match With Eurorack Gear

Designed for Eurorack, the 904B is easy to incorporate into your modular rig. Use the included screws to mount it in your case, then plug in the power and audio connections. With 8 HP of width, it leaves room for other modules. Mix the 904B with other vintage-inspired Behringer units like the Model D synth or combine it with modules from any Eurorack manufacturer. Build your perfect rig with the authentic sound of the 904B filter.


  • Vintage-sounding 904B high-pass VCF module from the '70s in Eurorack format
  • Audio in and out connectors plus three CV inputs for control of frequency
  • Frequency control and range switch allows full manual control of cutoff frequency
  • From a series of modules that reproduce the System 55, 35 and 15 series synths
  • Analog circuitry used on famous pop, rock and jazz records beginning in the 1970s
  • Designed and engineered in the United Kingdom

An authentic addition to your Eurorack. Order now.


904B Voltage Controlled High Pass Filter Eurorack Module Specifications:

Eurorack requirements
  • 8 HP
  • 55 mA +12 V
  • 55 mA -12 V
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