Hazelrigg Industries DLC 500 EQ

Introducing the Hazelrigg Industries D Series, a refined collection of 500 Series modules that brings the unmistakable tone, warmth, and musical finesse of Hazelrigg and D.W. Fearn designs into a compact, studio-friendly format. The series includes the DVA Vacuum Tube Microphone Preamplifier/DI, the DLC Vacuum Tube Inductor Equalizer, and the DNE Pulse Width Modulation Compressor-each handcrafted with transformer-balanced signal paths and vacuum tube or high-headroom solid-state amplification for uncompromising audio integrity. Designed for professionals seeking world-class analog tone in a portable and cost-effective package, these modules deliver the clarity, control, and color expected of Hazelrigg gear.

The DVA offers up to 60 dB of gain with a hybrid tube/solid-state design, while the DLC provides smooth, musical EQ with hand-wound inductors and D.W. Fearn's proven tonal philosophy. The DNE brings PWM compression from the revered VT-7 into the 500 Series, offering intuitive controls, LED metering, and stereo linking. Each unit features thoughtful additions like high-pass filters, polarity reversal, and pad switches. Built for serious engineers, the D Series modules combine classic sonics with modern convenience in every detail.

• Classic Passive EQ Tone: Based on the filter circuit from the D.W. Fearn VT-5 and Hazelrigg VLC for rich, musical shaping.

• Hand-Wound Inductor: Delivers smooth, vintage-style equalization with detailed character.

• Vacuum Tube Input Stage: Features a 6072a tube for warm, harmonically rich sound.

• Transformer-Balanced I/O: Uses premium transformers on both input and output for analog depth and clarity.

• Flexible Frequency Controls: Independent knobs and frequency selectors for high cut, high boost, low boost, and low cut.

• Bypass Switch: Allows for instant A/B comparison or full bypass when needed.

• Front Panel Instrument Input: Convenient access for direct signal connection.

• Designed by D.W. Fearn: Engineered with high-end analog signal paths and sonic integrity.

• Built for the 500 Series Format: Fits any standard 500 series rack for portable, modular integration.

GENERAL OVERVIEW:

• Product Type: 500 Series equalizer module

• Design Origin: Based on the passive EQ circuit in the Hazelrigg VLC and D.W. Fearn VT-5

• Application: High-fidelity tone shaping for tracking and mixing

SIGNAL PATH AND COMPONENTS:

• Input Stage: Vacuum tube (6072a) based on VT-2

• Output Stage: Solid state, high gain, low total harmonic distortion

• Transformers: Installed on both input and output stages

• Inductors: Hand-wound, identical to those used in the VLC

EQUALIZATION CONTROLS:

• High Cut control

• High Boost control

• Low Boost control

• Low Cut control

• High Cut frequency selector

• High Boost frequency selector

• Low Boost frequency selector

• Low Cut frequency selector

• Bypass switch

CONNECTIVITY AND INTERFACE:

• Front panel microphone or instrument input

CONSTRUCTION AND BUILD:

• Format: 500 Series module

• Build Quality: Handcrafted, premium-grade components

• Design By: D.W. Fearn