The Focusrite ISA One Classic is a premium, single-channel microphone preamplifier that delivers the legendary Focusrite sound — inspired by the original ISA 110 preamp design from the iconic Focusrite Studio Console. It combines a transformer-based mic preamp, independent DI channel, and flexible I/O routing, making it a studio favorite for capturing vocals, instruments, and line-level sources with exceptional warmth and clarity.
Key Features
-
Legendary Focusrite Transformer-Based Mic Preamp – Derived from Rupert Neve’s classic ISA 110 circuit, delivering vintage analog warmth and precision.
-
Variable Input Impedance – Four impedance settings (Low, ISA 110, Medium, High) to perfectly match any microphone or instrument.
-
Independent Instrument (DI) Input – Discrete, high-quality DI with dedicated gain and output for direct instrument recording.
-
Professional Conversion (Optional Digital Card) – Expandable with an optional A/D converter card for up to 24-bit / 192 kHz digital output via AES/EBU, S/PDIF, or ADAT.
-
Dedicated Headphone Output – With independent mix control for zero-latency monitoring.
-
Analog VU Meter & LED Peak Metering – Accurate metering for both mic and DI signals.
-
Insert Point – Allows use of external compressors or EQ before A/D conversion.
-
Robust Portable Chassis – Desktop or rack-mountable design for flexible studio integration.
Technical Specifications
-
Inputs:
-
1 × XLR mic input (transformer balanced)
-
1 × TRS line input
-
1 × ¼″ instrument (DI) input
-
-
Outputs:
-
1 × XLR line output
-
1 × TRS line output
-
1 × DI output (XLR and TRS)
-
¼″ headphone output
-
-
Frequency Response: 20 Hz – 20 kHz ±0.1 dB
-
Dynamic Range: 120 dB (A-weighted)
-
Equivalent Input Noise: -126 dB
-
THD+N: < 0.001%
-
Phantom Power: +48V
-
Impedance Settings: 600Ω, 1.4kΩ (ISA 110), 2.4kΩ, 6.8kΩ
-
Power Supply: Internal (100–240V AC)
