Focusrite ISA Two 2 Channel Microphone Preamplifier
The Focusrite ISA Two packs two independent channels of legendary, transformer-based console preamplification into a single, 1U rackmount chassis. Built around the Lundahl LL1538 input transformers, this unit delivers up to of clean, ultra-low-noise analog gain.
Each channel features a four-position impedance selector switch allowing you to tailor how your microphone interacts with the Lundahl transformer.
Beyond microphone and line inputs, the front panel features two high-impedance instrument DI inputs, perfect for tracking direct bass and guitars. Each channel includes a dedicated variable high-pass filter. The continuous control allows you to dial in the exact cutoff frequency between and using a smooth per octave slope.
Key Features
- Dual Lundahl LL1538 Transformers: The industry-standard input transformer used in the iconic ISA 110 modules, delivering classic warmth and massive headroom.
- Up to 80dB of Linear Gain: Easily powers low-output ribbon, vintage dynamic, or modern condenser microphones with microscopic noise floor performance.
- Front-Panel Instrument DIs: High-impedance () TS inputs allow you to track guitars, bass, or keyboards directly without external DI boxes.
- Dedicated Rear Inserts: Rear balanced send-and-return loops let you easily patch outboard hardware compressors, gates, or EQs directly between the preamp and your converter.
- Variable High-Pass Filter: Fully adjustable from to using a high-slope /octave filter to target low-end mud.
- Multi-Segment LED Metering: Eight-segment LED meters on each channel provide precise, clear peak monitoring of your analogue signal levels.
Specifications
- Preamplifier Type: Solid State with Dual Lundahl LL1538 Input Transformers
- Channel Count: 2 Channels (Dual-mono/Stereo tracking)
- Maximum Gain: Up to (Mic) / Up to (Instrument DI)
- Variable Impedance Settings: Low (), ISA 110 (), Medium (), High ()
- High-Pass Filter: Variable ( per octave slope)
- Analog Inputs (Rear): 2x XLR Microphone Inputs, 2x TRS Balanced Line Inputs
- Analog Inputs (Front): 2x TS Unbalanced Instrument DI Inputs
- Analog Outputs: 2x XLR Balanced Line Outputs
- Hardware Inserts: 2x TRS Sends, 2x TRS Returns (1/4" balanced, switchable per channel)
- Power Supply: Internal universal power supply (, )
- Chassis Format: 1U Standard 19" Rackmount
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FF-ISA-TWO
Focusrite ISA Two 2 Channel Microphone Preamplifier
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