TECHNICAL SPECIFICATIONS
Circuit Design: Custom high-precision analog filter architecture by CJM Venter
Format: 500 Series (VPR Alliance & GDIY 51X compatible)
Filter Slopes: Steep 24 dB/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 and THAT 1646 output stages
Power Requirements: Standard ±16 V DC (500 Series rack)
DETAILED FEATURES
High-Pass Filter (Low-Cut):
Frequency Range: 20 Hz to 500 Hz (24 dB/oct)
Range Switch: Toggles between 20 Hz – 500 Hz and a fine-tuned 20 Hz – 150 Hz mode
Variable Resonance/Q-Factor: ±15 dB 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: 2 kHz to 22 kHz (24 dB/oct)
Range Switch: Extends range down from 500 Hz up to 22 kHz (24 dB/oct)
Variable Resonance/Q-Factor: ±15 dB 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 (±20 dB) 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.)