Focusrite ISA One Portable Desktop Microphone Preamp
2,965.00 Excl. VAT
- ISA series transformer-based preamplifier
- Flexible independent DI channel
- Switchable impedance
- Headphone output with volume control
- Dedicated insert point
- Optional stereo 192kHz A-D converter
- Lundahl LL1538 Input Transformer
Available on backorder
ISA One
Desktop Microphone Preamp
At the heart of the ISA range is the microphone preamplifier with its Lundahl input transformer — essentially the same circuit, based on the original ISA110, that has been used for 30 years in successive Focusrite designs. The input transformer imparts a special character to the sound that can’t be truly emulated in any other way: inseparable from the microphone itself, the transformer input stage is ideal for use with classic microphones. But this mic pre has a twist the original didn’t have, which makes it far more versatile: four carefully-selected impedances allow you to match microphone to input in different ways. Bring out the character of a classic mic or emphasise a special feature, or go for a totally transparent, modern sound — it’s up to you.Whether you’re an artist, engineer or producer, you’ll appreciate the versatility of the ISA One, with its front-panel DI input. The DI includes low/high impedance switching and an amplifier output, and its own feed to the optional A/D converter and separate rear-panel XLR output.

Classic mic pre with independent DI
Featuring a rugged, portable all-metal enclosure, ISA One combines the classic Focusrite microphone preamp with a flexible, independent DI channel and optional 192kHz precision A-D conversion. At the heart of the ISA range is the microphone preamplifier with its Lundahl input transformer – essentially the same circuit, based on the original ISA 110, that has been used for 30 years in successive Focusrite designs. The input transformer imparts a special character to the sound that can’t be truly emulated in any other way, while the modern twist of variable input impedance allows for a new degree of flexibility.
Whether you’re an artist, engineer or producer, you’ll appreciate the versatility of the ISA One, with its front-panel DI input. The DI includes low/high impedance switching and an amplifier output, and its own feed to the optional A-D converter and separate rear-panel XLR output.

Brainworx bx_console
The Focusrite Studio Console reborn in your DAW

| Weight | 1.67 kg |
|---|---|
| Dimensions | 41.15 × 19.05 × 11.18 cm |
| Analog Inputs: | 1 x XLR (Mic), 1 x XLR (Line), 1 x 1/4″ (Line), 1 x 1/4″ (DI), 1 x 1/4″ (Amp) |
| Frequency Response: | 10Hz-125kHz |
| Phantom Power: | Yes |
| Power Supply: | Standard IEC AC cable |
| Gain Range (Mic): | 0dB to 60dB in 10dB steps 20 dB of variable gain |
| EIN (Mic): | -126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz/22kHz band-pass filter |
| Noise (Mic): | Noise at output with unity gain (0 dB) and 22 Hz-22 kHz band pass filter-97 dBu |
| Signal-To-Noise Ratio (Mic): | 106 dB relative to max headroom (9dBu) |
| Gain Range (Line): | -20dB to 10dB in 10dB steps 20 dB of variable gain |
| Input Impedance (Line): | 10 kO from 10 Hz to 200 kHz |
| Total Harmonic Distortion Noise (Line): | Measured with a 0 dBu input signal, and a 22 Hz-22 kHz band pass filter0.0001 |
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