Focusrite ISA Two Dual Mono Microphone Preamp

The Focusrite ISA Two is a dual-mono microphone preamplifier that brings the classic Focusrite transformer-based sound to modern studios. Featuring two independent ISA 110-style preamps, variable input impedance, and high-quality Lundahl input transformers, it’s ideal for capturing vocals, instruments, and stereo sources with pristine detail, warmth, and depth.

Key Features

• Two Independent Transformer-Based Mic Preamps – Classic Focusrite ISA design derived from the original Rupert Neve ISA 110 console.

• Variable Input Impedance – Four selectable impedance settings (Low, ISA 110, Medium, High) optimize performance with any microphone.

• Lundahl LL1538 Input Transformers – Deliver rich harmonic character and smooth, musical tone.

• Independent Line and Instrument Inputs – Each channel features XLR, TRS line, and ¼″ instrument inputs for flexible recording setups.

• Insert Points on Each Channel – Patch compressors or EQs before A/D conversion or recording.

• Accurate Analog Metering – Large, backlit VU meters with adjustable calibration and LED peak indicators.

• Optional A/D Converter Card – Upgradeable to high-resolution 24-bit / 192 kHz digital output via AES/EBU, S/PDIF, or ADAT optical.

• Professional Build Quality – Rugged 1U rackmount design suitable for studios and live rigs.

Technical Specifications

• Channels: 2 independent mic preamps

• Inputs:

  • 2 × XLR mic inputs (transformer balanced)

  • 2 × TRS line inputs

  • 2 × ¼″ instrument inputs

• Outputs:

  • 2 × XLR line outputs

  • 2 × TRS line outputs

• Dynamic Range: 122 dB (A-weighted)

• Frequency Response: 20 Hz – 20 kHz ±0.1 dB

• Equivalent Input Noise: -126 dB

• THD+N: < 0.001%

• Phantom Power: +48V per channel

• Impedance Settings: 600Ω, 1.4kΩ (ISA 110), 2.4kΩ, 6.8kΩ

• Insert Points: 2 × TRS (one per channel)

• Power Supply: Internal (100–240V AC, auto-switching)