TECHNICAL SPECIFICATIONS
Circuit Design: Custom high-precision analog filter architecture by CJM Venter
Format: 500 Series (VPR Alliance & GDIY 51X compatible)
Filter Slopes: Steep 24dB/oct response curves on both Low-Cut and High-Cut filters
Output Trim: +/- 20 dB Line Trim at output (with Center Detent for easy recall)
Components: High-quality conductive plastic potentiometers for ultra-smooth control
Input/Output: Balanced THAT 1246 Input & THAT 1646 Output Stages
Power Requirements: Standard +/- 16V DC (500 Series Rack)
DETAILED FEATURES
High-Pass Filter (Low-Cut):
Frequency Range: 20Hz to 500Hz (24dB/oct)
Range Switch: Toggles between 20Hz – 500Hz and a fine-tuned 20Hz – 150Hz mode
Variable Resonance / Q-Factor: +/- 15dB peak adjustment to add weight, accenting low-end punch right at the cutoff point
Variable Blend: Continuously variable Dry / Wet control for seamless parallel low-cut filtering
Low-Pass Filter (High-Cut):
Frequency Range: 2kHz to 22kHz (24dB/oct)
Range Switch: Extends range down from 500Hz up to 22kHz (24dB/oct)
Variable Resonance / Q-Factor: +/- 15dB peak adjustment to introduce warm analog resonance or smooth top-end roll-offs
Variable Blend: Continuously variable Dry / Wet control for parallel high-pass/low-pass blending
Master Controls: Output Line Trim (+/- 20dB) to gain-stage signals perfectly after aggressive filtering or resonance boosts.
Premium Audio Path: High-headroom design featuring conductive plastic pots, original WIMA capacitors, and precision low-noise operational amplifiers.
Professional Build Quality: Dual-layer PCB with immersion gold finish for maximum durability and clean, reliable assembly.
WHAT'S INCLUDED IN THE KIT?
This is a Full DIY Kit including all parts for a successful build:
Powder-coated front panel with high-quality printing
All electronic components (resistors, capacitors, ICs, THAT-chips, conductive plastic pots)
Full set of high-quality Sifam knobs
(Note: This product requires assembly and soldering skills. Interactive assembly guides are available in our Build Manuals section.)