Focusrite ISA One Mic Preamp + DI Box

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Order now, and this can be delivered by: Monday, April 22

  • Focusrite ISA One Mic Preamp + DI Box, ideal for artists, engineers, and producers.
  • Features a rugged yet portable all-metal enclosure.
  • Flexible independent DI channel and switchable input impedance including classic ISA 110 setting.
  • It has a headphone output with volume control and a dedicated insert point.
£549.00 £521.55 Save 5%


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Focusrite ISA One Mic Preamp + DI Box

Rugged and Portable

With a rugged yet portable all-metal enclosure, the ISA One combines the classic Focusrite microphone preamp with a flexible, independent DI channel and optional 192kHz precision A-D conversion.


Lundahl Input

At the heart of the ISA range is the microphone preamplifier with its Lundahl input transformer, which is essentially the same circuit based on the original ISA 110 that have been extensively used for the last 30 years in successive Focusrite designs. The input transformer adds a special character to the sound that can’t be emulated any other way, plus the modern twist of variable input impedance allows for a new degree of flexibility.


DI Input

It doesn’t matter if you’re an artist, engineer, or producer, you’ll appreciate the sheer amount of versatility the ISA One provides with its front-panel DI input that includes low/high impedance switching and an amplifier output with its own feed to the optional A-D converter and separate rear-panel XLR output.


3-Year Warranty

With all Focusrite products, you’ll benefit from a 3-year warranty, and award-winning customer support.


Key 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
  • Included software – eStore: Brainworx bx_console Focusrite – an exclusive plug-in that faithfully captures the sound, feel and styling of the original Focusrite ISA 110 Equaliser and ISA 130 Dynamics Modules

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-97dBu
  • 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 24dBu 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): 10kO from 10 Hz to 200 kHz
  • Total Harmonic Distortion Noise (Line): Measured with a 0 dBu input signal, and a 22 Hz-22 kHz bandpass filter0.0001
  • 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: 220mm (W) x 104mm (H) x 254 - 290mm
  • Weight: 3.9 kg (8.6 lbs)