PFMOD ™ HP-SUB (High Pass Subsonic Filter)

🇺🇸 MADE IN THE USA 🇺🇸

Harrison Labs PFMOD HP-Sub | 2 Channel Passive Subsonic Filter & Rumble Reducer

Protect your subwoofers and maximize bass efficiency. The Harrison Laboratories HP-Sub is a specialized passive inline 2 channel crossover, designed to function as a high-precision subsonic (infrasonic) filter. By removing ultra-low frequencies that fall below the audible range, this "rumble filter" prevents mechanical damage and ensures your amplifier power is focused entirely on the bass you can actually hear.

Technical Specifications

• Filter Type: Passive Inline Subsonic / High-Pass (HPF)

• Selectable Frequencies: 20 Hz, 25 Hz, 30 Hz, and 35 Hz (Jumper Selectable)

• Slope: 12 dB per Octave (Standard)

• Design: Passive Active Crossover Simulator

• Compatibility: RCA Line-Level Signal Paths