Focusrite’s microphone preamplifiers go back to the original Focusrite ISA 110 modules, when Rupert Neve was commissioned by George Martin in 1985 to create a no-compromise channel strip for his Neve console. Combining the very best solid-state electronics with transformer coupling, Focusrite mic pres have played a key part in the recording of hundreds of hit records and they’re the choice of leading artists, producers and engineers around the world.

At the heart of the ISA Two is a pair of Lundahl LL1538 transformers. ISA products have relied on Lundahl from the beginning, since their components were originally specified in 1985. The LL1538 features a 3-section winding, resulting in very low leakage inductance and, as a result, an extended frequency response. They’re encapsulated in mu-metal cans to shield them from stray magnetism.

ISA Two features two classic Focusrite mic preamps, with four impedance settings including the original ISA 110 setting. Variable input impedance allows you to go for an accurate, transparent sound or choose to highlight the character of your favourite vintage mic – and anywhere in between. With up to 80 dB of low-noise gain, ISA Two can perform in the most demanding situations – really bringing your ribbon, condenser or moving coil mics to life.

Each channel has a fully-balanced insert point accessed via TRS sockets on the rear panel and activated with a front-panel button, so it’s easy to use outboard processors with the ISA Two. Just plug in your choice of EQ, compressor or limiter.

Specifications

Front panel, per channel:

• 1/4″ instrument input
• Variable input impedance – Low, ISA 110, Medium, High
• Input selection – Mic, Line, Instrument
• 0 – 30 dB/30 – 60 dB gain switch
• Phantom power switch
• Phase invert switch
• 0 – 60 dB gain in 10 dB steps
• 0 – +20 dB continuously variable trim
• Variable high-pass filter with on/off switch
• Insert point on/off switch
• Eight-LED user-calibrated level meters
• Single power switch

Rear panel, per channel:

• XLR-F mic inputs
• 1/4″ TRS line inputs
• 1/4″ TRS Sends
• 1/4″ TRS Returns
• XLR-M line output
• Single peak meter calibration dial
• Single IEC power socket