The HP40 is a high-pass filter module based on the SSI2140 chip, the successor to the legendary SSM2040 filter design. It delivers a refined analog high-pass response with voltage-controlled resonance and precise tracking, making it a powerful tool for shaping sharp, clean, and expressive tones in modular synthesis systems.
Designed as a compact, high-performance filter module, the HP40 preserves the character of classic analog circuitry while adding modern control capabilities such as temperature-compensated 1V/Oct tracking and wide CV response flexibility.
Features
High-pass filter based on SSI2140 analog filter architecture
Voltage-controlled resonance for dynamic tonal shaping
Frequency CV accepts both positive and negative control voltages
1V/Oct tracking with internal temperature compensation
Three filter slopes: 12 dB, 18 dB, and 24 dB outputs
Multiple simultaneous outputs for flexible routing options
Dual 24 dB outputs enable band-pass patching with external modules
Capable of rich resonance behavior from subtle filtering to extreme tonal effects
Designed for modular synthesis environments with high sonic precision
Compact form factor optimized for dense Eurorack systems
Specifications
Product: HP40 High-Pass Filter Module
Filter Type: Analog high-pass (SSI2140-based)
Control: CV-controlled frequency and resonance
Resonance CV Range: 010V
Tracking: 1V/Oct with temperature compensation
Outputs: 12 dB, 18 dB, dual 24 dB outputs
Width: 4HP
Depth: 24 mm
Power Consumption: 21 mA @ +12V / 50 mA @ -12V
Included
HP40 High-Pass Filter module
