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Focusrite ISA One | Vintage Microphone Preamplifier

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  • $ 499.99
  • Regular price $ 799.99

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Focusrite ISA One Microphone Preamp

If you've been looking for a step up in preamp quality, look no further. This is the legendary Focusrite preamp sound, a descendant of Rupert Neve's original designs, in a portable and rugged metal enclosure. Plus, the ISA One delivers an independent DI for souped-up direct sound, and optional 192kHz A/D conversion for the clearest sound straight into the box.

Record the sound of history.

  • Microphone preamp based on the legendary Focusrite ISA 110 and four different impedance settings to perfectly match your mic - includes the original ISA 110 setting.
  • Independent direct input on the front panel with an amp out, rear-panel XLR out, impedance switch, and separate feed to the optional A/D converter.
  • Dedicated insert point (rear-panel send/return) for adding extra processing, 

Flexible, modern features.

The ISA One isn't just imitating a classic. It features a headphone output that can either play back the sound of the ISA One's inputs, or a cue mix from the TRS inputs on the back. It features optional high-quality Focusrite A/D conversion, a VU meter, and two 6-LED peak meters.

Your quality music deserves legendary sound - get it with the Focusrite ISA One today!

Full Features

  • Focusrite mic preamp based on the venerated ISA 110.
  • Independent instrument DI with amp output.
  • Dedicated insert point for extra processing after the preamp.
  • Optional A/D conversion - another Focusrite speciality.
  • VU meter and two 6-LED peak indicator meters.
  • Phantom power, phase, and high pass filter switches on front panel.
  • Four different impedance settings for mic pre, hi/lo impedance settings for DI.
  • Headphone output plays back either input signals or cue mix.

Full Specs

Analogue Channel Inputs

  • XLR Mic input
  • One XLR and one TRS line input
  • XLR Instrument input TRS Jack
  • External ADC input TRS Jack
  • TRS jack return

Analogue Channel Outputs

  • TRS jack send
  • XLR balanced line output
  • XLR DI output
  • TS jack DI through

Analogue Channel Additional I/O

  • TRS Jack cue mix left input
  • TRS Jack cue mix right input
  • 1/4” TRS Jack headphones output

Mic Input Response

Gain range 0dB to 60dB in 10dB steps + 20 dB of variable gain
Input Impedance Switched Impedance setting Equivalent Input Impedance at 1kHz Low = 600 Ohms
ISA110 = 1400 Ohms
Med = 2400 Ohms
High = 6800 Ohms
EIN (Equivalent Input Noise) -126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz/22kHz band-pass filter
Noise Noise at output with unity gain (0 dB) and 22 Hz-22 kHz band pass filter -97 dBu
Signal-to-Noise Ratio 106 dB relative to max headroom (9dBu)
Total Harmonic Distortion + Noise Measured at medium gain (30dB) with a 1kHz -20dBu input signal and with a 22Hz/22kHz band-pass filter < 0.0009%
Frequency Response At minimum gain (0 dB) -0.5dB down at 10Hz and -3dB down at 125kHz
  At maximum gain (60dB) -3dB down at 16Hz and -3dB down 118kHz
CMRR (Common Mode Rejection Ratio) 98dB (Channel 1, 1kHz, maximum gain with +24 dBu input)
Crosstalk Channel to Channel With 10dB@1kHz input to chA, chB output =104dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA

Line Input Response

Gain range -20dB to +10dB in 10dB steps + 20 dB of variable gain
Input Impedance 10 kΩ from 10 Hz to 200 kHz
Noise Noise at main output with gain at unity (0 dB) measured with 50 Ω source impedance and a 22Hz - 22 kHz band pass filter -96 dBu
Signal-to-Noise Ratio Measured with a 22 Hz-22 kHz band pass filter 120 dB relative to max headroom (24 dBu)
118dB relative to 0dBFS (+22dBu)
Total Harmonic Distortion + Noise Measured with a 0 dBu input signal, and a 22 Hz-22 kHz band pass filter 0.0001%
Frequency Response At unity gain (0 dB) -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
Low =greater than 300k
Noise Measured with 22 Hz-22 kHz band pass filter Minimum gain (+10 dB): -92 dBu
Maximum gain (+40dB): -62dBu
THD At minimum gain (+10)
Frequency Response At minimum gain (+10 dB) -10dB input: 10Hz-100kHz +/- 0.6dB
  At maximum gain (+40 dB) -40dB input: -2.5dB down at 10Hz and 0dB at 100kHz

Meters

Moving Coil (MC) Meter factory calibrated to 0VU = +4dBu with 1kHz sinewave. With the VU Cal button pressed the meter can be adjusted on the rear panel to allow 0VU to equal +10dBu to +26dBu with the centre detent being equal to +22dBu.
Peak LED Meters Calibrated in the detent position for 0dBFS = +22dBu, calibration is adjustable on the rear panel to allow 0dBFS to equal +10dBu to +26dBu
Routing for MC and Peak1 meter is after the HPF, pre insert send or switched post insert return. Peak2 is always pre ADC channel 2, which can be fed by external input or Instrument input.
LED Levels As follows, when peak calibration is set to center detent on the rear panel. (This is when using the internal ADC). 0 = +22dBu
-2 = +20dBu
-6 = +16dBu
-12 = +10dBu
-18 = +4dBu
-42 = -20dBu
Frequency Response At minimum gain (+10 dB) -10dB input: 10Hz-100kHz +/- 0.6dB
  At maximum gain (+40 dB) -40dB input: -2.5dB down at 10Hz and 0dB at 100kHz

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 (D - top to bottom) 8.66" (W) x 4.1" (H) x 10" - 11.4" (D - top to bottom)
Weight 3.9 kg 8.6 lbs
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