Hazelrigg Industries 4DI DI BOX
4-channel tube DI, Jensen transformers, 1M ohm input, mic-level XLR out, ground lift, rich tone for bass, synths, acoustics, rackmount design.
The Hazelrigg Industries 4DI is a premium 4-channel all-tube direct injection box, based on D.W. Fearn's classic VT-I/F design. Housed in a rugged 2U rackmount chassis, it delivers warm, harmonically rich DI tone for electric instruments, synths, and acoustic pickups. Each channel features a front-panel locking 1/4'' input, rear-panel passthrough, XLR mic-level output, and a ground lift switch with LED indicator. Handcrafted in the USA, the 4DI is ideal for both studio and live setups, offering high headroom, low distortion, and unmatched sonic depth.
Features
True All-Tube Signal Path: Each channel uses a premium vacuum tube circuit based on the legendary D.W. Fearn VT-I/F design for deep, rich analog tone.Four Independent DI Channels: Perfect for handling multiple instruments simultaneously in studios, live sound setups, or houses of worship.Instrument-Level Inputs Front & Rear: Locking 1/4'' inputs on the front and mirrored pass-through jacks on the rear provide flexible routing options.Transformer-Balanced Mic-Level XLR Outputs: Delivers warm, low-noise, mic-level signals designed to match 150-ohm professional preamps.Massive Headroom and Detail: Captures full dynamic range from electric bass, guitar, synths, and acoustic instruments with pickups - without harshness.Ground Lift Per Channel: Each input has its own locking ground lift switch with LED status to help eliminate hum and buzz in complex setups.Built for the Stage and Studio: Housed in a rugged all-steel 2U rack chassis, designed for professional use under demanding conditions.Handcrafted in the USA: Carefully assembled and tested by hand to ensure consistency and sonic excellence.
Specifications
General Overview
4-channel all-triode vacuum tube direct injection (DI) boxBased on D.W. Fearn's classic VT-I/F designPart of Hazelrigg Industries' Solution Series (with VNE, VLC, VEC, and VDI)Designed for use in studios, live FOH, and houses of worshipHandcrafted in the USA with premium-grade components
Audio Circuitry
Pure analog vacuum tube signal path using selected 6072 or 12AY7 triodesEach channel features independent DI circuitryCustom Jensen transformer-balanced mic-level outputCathode-follower output stage with capacitive coupling for optimum isolationInput impedance: 1 M ohmOutput impedance: Matches 150 ozhm mic inputs
Input and Output Specifications
Inputs: 4 front-panel locking 1/4 in mono instrument jacksPass-through: 4 rear-panel 1/4 in parallel input/thru jacksOutputs: 4 rear-panel gold-plated XLR mic-level balanced outputs (pin 2 hot)Gain: -10 dBMax input level: 2.3 V peak-to-peak (1% THD)Frequency response: 10 Hz - 20 kHz +/-0.2 dBTHD+N: < 0.3% (20 Hz - 20 kHz)Intermodulation distortion: < 0.01% SMPTENoise: -90 dB below output (22 Hz - 22 kHz bandwidth)Max output level: -12 dBm nominal
Front Panel Features
4 locking 1/4 in instrument inputsLED indicators per channel (signal and ground lift status)4 ground lift switches (locking toggle style)Power switch with integrated red pilot lightFully regulated power supplies for filament and plate voltages
Rear Panel Features
4 gold-plated XLR mic-level outputs4 input/pass-through pairs (1/4 in TS jacks)GND terminal for external grounding schemesIEC power inlet with voltage selector (115V / 220V)Fuse: 1A (115V) / 0.5A (220V)
Mechanical and Power
Rackmount: 2U height (3.5 in), all-steel constructionDimensions: 6.25 in W - 2.25 in H - 9.5 in D (15.9 - 5.7 - 24.2 cm)Weight: 14 lbs (6.35 kg)Power: 120/220 VAC 50/60 Hz, 25 WSuggested warm-up: 5 minutes for optimal performance
Maintenance
Tubes: 4 - 6072 / 12AY7 (user replaceable, matched for low noise and microphonics)Tube life: multiple years, tested for noise and microphonicsFilter capacitors rated for >20 yearsUser-replaceable with manufacturer-recommended parts
Applications
Electric and acoustic guitars/basses with pickupsElectric pianos, synthesizers, samplersSuited for studio recording, live sound reinforcement, and broadcast scenariosCompatible with any professional mic preamp; optimized for VT-1, VT-2, and VLC
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