Focusrite ISA One Classic Mic Pre with Independent DI


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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.

The ISA One is a high quality preamplifier, which can be used to record microphone, line-level or instrument sources. Microphones and line-level sources are connected on the rear panel, whilst instruments are plugged directly into the front panel. The front panel also features gain controls and other settings such as phantom power and input impedance. A traditional moving-coil VU and an LED peak meter are provided, both with a dial on the rear panel for calibration, to ensure a suitable signal level is achieved. 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.

Focusrite ISA One Mic Pre Features:

  • Classic ISA mic preamp design featuring Lundahl LL1538 input transformer.
  • Flexible independent DI channel.
  • Switchable input impedance including classic ISA 110 setting.
  • Headphone output with volume control.
  • Dedicated insert point.
  • Optional stereo 192kHz A-D conversion card.

Focusrite ISA One Specifications:

Mic Input Response
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)
Frequency Response (Mic): At minimum gain (0 dB)-0.5dB down at 10Hz and -3dB down at 125kHz
CMRR (Mic): 98dB (Channel 1, 1kHz, maximum gain with 24 dBu input)
Crosstalk Channel to Channel (Mic): With 10dB@1kHz input to chA, chB output =104dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA

Line Input Response
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 filter 0.0001
Frequency Response (Line): At unity gain (0 dB)-0.3dB down at 10Hz and -3dB down at 200kHz

Instrument Input Response
Gain range (Instrument): 10dB to 40dB continuously variable
Input Impedance (Instrument): High = greater than 1M Low = greater than 300k
THD (Instrument): At minimum gain ( 10)

High-Pass Filter
Roll-Off: 18 dB per octave (3 pole filter)
Frequency: Fixed 75Hz measured at the 3dB down point

Weight and Dimensions
W x D x H: 8.66" x 4" x 10" - 11.4" / 220mm x 104mm x 254 - 290mm
Weight: 3.9 kg (8.6 lbs)

Each ISA One Retail Box Includes:
(1) Focusrite ISA One Classic Mic Pre with Independent DI

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