BIGZUN RC2 – Passive Low-Pass + High-Pass Filter, 2HP Eurorack Module (assembled and tested)

RC2 is a passive low-pass + high-pass filter in just 2HP. Two smooth 6 dB/oct filters, one knob each, no power cable – and one signal can give you a dark and a bright version at the same time.

What it does

• LP (low-pass) darkens a sound by removing highs – clockwise = brighter
• HP (high-pass) thins a sound by removing lows – clockwise = thinner
• IN HP is normalled to IN LP: with no cable in IN HP, both filters hear the same signal. Patch one source into IN LP and take a dark version from OUT LP and a bright one from OUT HP.
• Patch OUT LP into IN HP for a simple band-pass.

Gentle first-order filtering with no resonance – great for warming up a saw wave, taming noise into wind and sea textures, cleaning the low end of pads, or slow hand-played sweeps in the classic Berlin School style.

Technical specifications

• Width: 2HP · depth approx. 13 mm
• Power: none – fully passive, no ribbon cable needed
• LP cutoff: 0.67 kHz – 17 kHz (into a typical 100 kΩ input)
• HP cutoff: 31 Hz – 800 Hz (from a typical 1 kΩ module output)
• Slope: 6 dB/octave, no resonance
• Signals: audio, safe with any Eurorack level (±12 V)
• Black front panel, black PCB

In the box

• RC2 module – fully assembled and tested
• 2 × M3 mounting screws

Knobs are not included – the knurled potentiometer shafts are used directly.

Good to know

Being passive, RC2 works best between a normal module output and a normal module input (around 100 kΩ). Very low input impedances after it, or another passive module before it, narrow the range – this is how all passive filters behave. It is designed for audio; for smoothing CV use a slew limiter.

Shipping

Handmade in Poland. Securely packed and dispatched within 1–2 working days with tracking.

User manual: available for download on the manufacturer's website.