H2 Audio 0011/Stereo 2-Channel Mic Pre/EQ

The H2 Audio 0011/Stereo delivers two channels of the iconic Helios 0011 Mic Preamp and EQ circuitry, housed in a rugged 2U 19” rack unit for modern studio setups. Built with the same analog warmth and character that defined countless classic recordings, this dual-channel version retains all the sonic features and vintage tone of the original 0011, now optimized for efficient rack-mounted use.

Each channel features the legendary Helios 2128 mic preamp circuit, offering up to 70dB of gain in 5dB increments. The unit includes a Lustraphone input transformer, 20dB pad, and a balanced line input section. The EQ section features inductor-based low and mid-frequency controls with selectable bands, along with a fixed 10kHz high-frequency shelf. Also onboard are phase inversion, EQ bypass, and a selectable high-pass filter with original 40Hz and 80Hz filter points.

A key enhancement is the addition of an output amplifier and transformer based on original Helios designs, capable of driving a 600-ohm load with up to 25dB before clipping — a significant upgrade over vintage units.

Key Features:

• Dual-channel Helios 0011 circuitry – Legendary British preamp tone with integrated 3-band EQ
• Helios 2128 mic preamp – 70dB gain range in 5dB steps with 20dB pad
• Lustraphone input transformer – Authentic analog character
• Inductor-based EQ section – Selectable LF and MF bands, fixed 10kHz HF shelf
• High-pass filter – Selectable 40Hz and 80Hz modes
• Output amplifier and transformer – Designed to handle modern studio load requirements
• Rackmounted 2U steel chassis – Built for durability and professional integration

Specifications

• Rack Format: 2U, 19” steel construction
• Mic Gain Range: 0–70dB (in 5dB steps)
• Input Pad: -20dB
• High-Pass Filter: Selectable 40Hz / 80Hz
• EQ: Inductor-based LF and MF, Fixed HF (10kHz)
• Output: Transformer-balanced, up to +25dB output level