Focusrite ISA One

Focusrite ISA One

ISA One delivers the classic Focusrite transformer mic preamp sound in a rugged, portable chassis. Featuring a Lundahl LL1538 input transformer and four selectable impedances — including the original ISA110 setting — it offers exceptional tonal flexibility alongside a fully independent DI channel.

✅ ISA series transformer-based mic preamp (Lundahl LL1538)
✅ Four selectable mic impedances (incl. ISA110)
✅ Up to 80 dB gain (60 dB + 20 dB trim)
✅ Independent DI channel (High 2.4 MΩ / Low 470 kΩ)
✅ Amp output + separate rear XLR output
✅ Fixed 75 Hz High-Pass Filter (18 dB/oct)
✅ Dedicated insert point
✅ Stereo cue mix inputs (rear TRS)
✅ Backlit VU meter + dual 6-LED peak meters
✅ Optional 192 kHz A-D converter (118 dB dynamic range)

Mic Input:
Gain: 0–60 dB stepped + 20 dB trim
EIN: -126 dB
CMRR: 98 dB
Frequency Response: 10 Hz – 125 kHz

Line Input:
Gain: -20 dB to +10 dB + trim
Input Impedance: 10 kΩ

Instrument Input:
Gain: 10–40 dB
Impedance: >1 MΩ (High) / >300 kΩ (Low)

In the box:
– ISA One unit

Tags: Focusrite ISA One, ISA One, Microphone preamplifiers