H2 Audio 0011 Mic Preamp & 3-Band EQ

The H2 Audio 0011 is a faithful recreation of the iconic Helios console channel module — responsible for the signature sound of countless classic records. Designed around the original Helios 2128 preamp circuit, the 0011 delivers legendary tone with modern enhancements for today’s studios.

This premium 1U rack module offers up to 70dB of gain in precise 5dB steps, paired with a Lustraphone input transformer and a balanced line input. It also features a 20dB pad, phase switch, and selectable high-pass filters at 40Hz and 80Hz, maintaining vintage authenticity while adding studio-ready flexibility.

Its 3-band inductor-based EQ section includes selectable low and mid frequencies and a fixed 10kHz high shelf, giving you the warm, musical shaping that defined the golden era of analog recording.

Key Features:

• Original Helios 2128 Preamp Circuit – Delivers up to 70dB of gain in 5dB steps
• Lustraphone Input Transformer – Classic British console tone with rich harmonic detail
• Inductor-Based 3-Band EQ – Selectable LF and MF bands with fixed 10kHz HF
• Selectable High-Pass Filter – Toggle between 40Hz and 80Hz for low-end control
• Balanced Line Input – Offers flexible routing options for re-amping and outboard use
• Output Amplifier & Transformer – Fully original Helios design, drives 600 ohms up to 25dB before clipping
• Phase Invert & EQ Bypass – Quick workflow controls for creative and corrective EQ moves
• Phantom Power – 48V supplied via H2 Audio 8-Channel Rack

Legendary Tone, Studio-Ready Power

More than just a reissue, the H2 Audio 0011 solves the practical limitations of vintage Helios modules with a modern output amplifier that can comfortably drive modern studio gear — something original modules struggled with. Whether you’re tracking vocals, drums, guitars, or synths, the 0011 offers punchy transients, silky highs, and unmistakable midrange character that defined the Helios sound.

Specifications

• Gain: Up to 70dB in 5dB increments
• Input: Mic with Lustraphone transformer; Balanced Line Input
• EQ: Inductor-based 3-band EQ with selectable LF/MF and fixed HF at 10kHz
• High-Pass Filter: Selectable 40Hz or 80Hz
• Additional Controls: Phase Invert, EQ Bypass, 20dB Pad
• Output: Helios-designed output amplifier and transformer; 600 ohm capable
• Phantom Power: 48V via H2 Audio 8-channel rack

From Led Zeppelin to The Rolling Stones, the Helios sound helped shape music history. The H2 Audio 0011 brings that unmistakable tone into your modern studio with all the warmth, punch, and clarity that engineers continue to chase.