The Focusrite ISA Classic Microphone Preamp is part of the esteemed ISA range that has a legacy dating back to the 1980s. Originally designed by Rupert Neve for Sir George Martin’s AIR Studios, the ISA (Input Signal Amplifier) modules are renowned for their signature sound which includes clarity, transparency, and a touch of warmth, making them favorites among audio engineers and producers for recording vocals and instruments.

The ISA Classic Microphone Preamp offers a replication of the original ISA 110 module from the first Focusrite console. It features a transformer-based preamp design with a Lundahl LL1538 transformer, contributing to its characteristic large headroom and unique sound. This preamp provides the user with variable input impedance, allowing for versatility in matching with any microphone or instrument type, enhancing its flexibility and usability in various recording situations.

Key features typically include:

- The classic ISA transformer-based preamp design, ensuring the distinctive Focusrite sound.

- Variable input impedance, which allows users to fine-tune the preamp to suit different microphones.

- A high-pass filter to eliminate unwanted low frequencies.

- Phantom power, phase reverse, and an optional digital output, providing modern connectivity and integration with digital interfaces.

- The renowned AIR feature, which adds an analog emulation of the classic transformer-based frequency response to recordings, offering an additional layer of sonic enhancement.

The Focusrite ISA Classic Microphone Preamp is celebrated for its ability to add depth and presence to recordings, making it a popular choice for professional studios and home recording enthusiasts alike. Its durable construction, combined with its exceptional sound quality, continues the legacy of the original ISA modules, making it a valued piece of equipment in any audio recording setup.