Focusrite ISA Two 2‑Channel Rack‑Mount Microphone Preamplifier
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Focusrite ISA Two 2‑Channel Rack‑Mount Microphone Preamplifier
The Focusrite ISA Two brings two independent, legendary ISA 110‑derived microphone preamps into a compact 1U rack format. Combining Lundahl LL1538 transformer input stages with rotary gain control and variable impedance, it offers both the classic Focusrite warmth and modern flexibility for high-quality analog signal capture.
Each channel features front‑panel instrument and rear‑panel line/mic inputs, switchable impedance, individual high‑pass filters, inserts, and LED metering calibrated via rear‑panel trim—making it a powerful studio-quality unit for vocal, instrument, or stereo tracking.
Key Features
- Inputs: Mic (XLR), Line (TRS), front-panel DI (¼″ TS); switchable input impedance (Low: 600 Ω, ISA 110: 1.4 kΩ, Medium: 2.4 kΩ, High: 6.8 kΩ)
- Gain: Up to 80 dB of clean gain (60 dB stepped + 20 dB trim)
- High-Pass Filter: Smooth 18 dB/octave filter, variable from 16 Hz to 420 Hz
- Inserts: Balanced insert send/return per channel for external processing
- Metering: Front-panel 8‑segment LED meters with rear-panel calibration
- Transformers: Lundahl LL1538 input transformers—same as the original ISA 110 design
- Connectivity: Rear-panel mic, line, insert, and output jacks; IEC power input, calibration knob
- Power & Environment: Internal universal power supply (100–240 VAC, 35W). 1U rack height; requires ~75 mm rear clearance; max ambient temp 40 °C
- Warranty: 3‑year manufacturer’s warranty
Technical Specifications
- Dimensions: 19.0" (W) × 12.8" (D) × 1.7" (H) (~482 × 325 × 44 mm)
- Weight: 3.7 kg (8.12 lb)
- High-Pass Filter: 18 dB/octave, 16–420 Hz
- Maximum Gain (Mic): Up to 80 dB total
- Operating Power: 100–240 VAC, 35 W
What's Included
- 1x ISA Two 1U rack-mounted mic preamp unit
- 1x IEC mains power cable
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