H2 Audio 2128 “Helios” Mic Preamp

The H2 Audio 2128 brings the unmistakable tone of the iconic Helios mic preamp into the 500 Series format. Featuring the original preamp circuit found in the renowned 0011 module, the 2128 delivers the same rich, harmonically complex sound that defined countless classic recordings — now in a modern, modular format for today’s hybrid studios.

With 70 dB of gain, a 20 dB pad, phase control, and 48V phantom power, the 2128 is designed for maximum flexibility across a wide range of sources. A selectable high-pass filter gives additional tonal control, while the inclusion of a custom Lustraphone input transformer and transformer-balanced output stage ensures true vintage character and depth. An onboard output fader allows you to dial in the perfect gain structure for tracking or mixing.

Key Features:

• Original Helios preamp circuit – Derived from the H2 Audio 0011 module
• Up to 70 dB of gain – Ideal for dynamic, ribbon, and condenser microphones
• Custom Lustraphone input transformer – Delivers vintage color and detail
• Transformer-balanced output – With discrete output amplifier for analog warmth
• Output fader – Precision control of signal level post-gain
• 20 dB pad, phase reverse, and 48V phantom power – Studio-standard controls
• Selectable high-pass filter – Tighten low-end response with original 40Hz and 80Hz settings
• 500 Series format – Compatible with all standard 500 Series racks

Specifications

• Format: 500 Series module
• Gain Range: Up to 70 dB (in 5 dB steps)
• Input: Custom Lustraphone transformer-balanced
• Output: Transformer-balanced with output amplifier
• Controls: Pad (20 dB), Phase, 48V, HPF (40Hz/80Hz), Output Fader