Focusrite ISA ONE Classic Mic Pre with Independent DI

Sale price$ 699.99 Regular price$ 899.99
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Configuration: Without 2 Channel AD Dante Converter


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Focusrite ISA ONE Classic Mic Pre with Independent DI


Focusrite ISA ONE Classic Mic Pre with Independent DI

The Focusrite ISA ONE is a single-channel preamp featuring the original ISA design, Lundahl LL1538 input transformer, switchable input impedance including classic ISA 110 setting, variable high-pass filter, independent instrument input, and LED peak meter. 

The Focusrite ISA ONE gives you one channel of the console preamp designed for George Martin's AIR Studios, with modern performance enhancements. The ISA ONE retains the classic ISA sound, which in part, comes from its Lundahl LL1538 input transformer and custom Zobel network, which imparts a special character to the sound that can't be truly emulated in any other way. Whereas the original ISA input impedance was calculated to suit the microphones of the day, today's model makes one small change, adding three additional input impedances to the classic ISA 110 setting, allowing you to match any microphone, vintage or modern, and access a wide range of sounds. The ISA ONE also features an independent instrument DI, which gives you the flexibility of simultaneous instrument and vocal recording. You can also use the ISA ONE as a DAW front end with zero-latency monitoring with the optional A-D card, offering up to 24-bit/192kHz sampling via ADAT or AES3. 

Focusrite ISA ONE - Just the Facts

  • 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 - Under the Hood

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 ONE is the Lundahl input transformer, which is essentially the same circuit as the original ISA 110, 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 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.

Whether you're an artist, engineer or producer, you'll appreciate the versatility and heritage sound of the Focusrite ISA ONE. Order yours today. For more information, call or chat online with your PAD Studio Specialist.



Mic Input Response

  • Gain range: 0dB to 60dB in 10dB steps 20dB of variable gain
  • Input impedance: 600 ohm, 1.4k ohm (ISA 110), 2.4k ohm, or 6.8 ohm
  • EIN: -126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz/22kHz band-pass filter
  • Noise: Noise at output with unity gain (0dB) and 22 Hz-22 kHz band pass filter-97dBu
  • Signal-to-noise ratio: 106dB relative to max headroom (9dBu)
  • Frequency response: At minimum gain (0dB) -0.5dB down at 10Hz and -3dB down at 125kHz
  • CMRR: 98dB (Channel 1, 1kHz, maximum gain with 24dBu input)
  • Crosstalk channel-to-channel: With 10dB@1kHz input to Ch. A; Ch. B output =104dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA

Line Input Response

  • Gain range: -20dB to 10dB in 10dB steps 20dB of variable gain
  • Input impedance: 10k ohm from 10Hz to 200kHz
  • THD + N: Measured with a 0dBu input signal, and a 22Hz-22kHz band pass filter 0.0001
  • Frequency response: At unity gain (0dB) -0.3dB down at 10Hz and -3dB down at 200kHz

Instrument Input Response

  • Gain range: 10dB to 40dB continuously variable
  • Input impedance: High = greater than 1M ohm; Low = greater than 300k ohm
  • THD: At minimum gain (10dB): 0.001%

High-Pass Filter

  • Roll-off: 18dB per octave (3-pole filter)
  • Frequency: Fixed 75Hz measured at the 3dB down point

Front and Rear Connectivity

Analog Channel Inputs:

  • Mic input: XLR x 1
  • Line input: XLR x 1 and TRS x 1
  • Instrument input TS Jack x 1
  • External ADC input: TRS Jack x 1 Return: TRS Jack x 1

Analog Channel Outputs:

  • Send: TRS Jack x 1
  • Balanced line output: XLR x 1 DI output: XLR x 1
  • DI through: TS Jack x 1

Analog Channel Additional I/O:

  • Cue mix left input: TRS Jack x 1
  • Cue mix right input: TRS Jack x 1
  • Headphones output: 1⁄4" TRS Jack x 1

Dimensions (W x D x H):

  • 8-5/8" x 4-1.8" x 10" - 11-7/16" (220 x 104 x 254 - 290mm)


  • 6 lb. (3.9 kg)

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