Focusrite Pro ISA ONE Single Channel Microphone / Instrument Preamplifier with Independent DI

OUR PART #: ISAONE MFR #: AMS-ISA-ONE

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The ISA One microphone pre-amplifier delivers Focusrite's prestigious ISA transformer-based pre-amp in a rugged and portable chassis, at a groundbreaking price. ...Read more

Focusrite Pro ISA ONE Single Channel Microphone / Instrument Preamplifier With Independent DI Image 1
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Focusrite Pro ISA ONE Single Channel Microphone / Instrument Preamplifier With Independent DI
Our Price: $599.99
List Price: $749.99
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Product Overview

The ISA One microphone pre-amplifier delivers Focusrite's prestigious ISA transformer-based pre-amp in a rugged and portable chassis, at a groundbreaking price.

And now you can add the iconic sound, feel, and styling of the legendary Focusrite console to your production toolkit simply by registering your ISA One. The Bx_console Focusrite SC is a virtual channel strip from the original console featuring the ISA 110 EQ and ISA 130 dynamics module including the compressor/limiter, expander/gate, and de-esser. The plugin is an SC VST/AU/AAX compatible plug-in for Mac and PC, and yours for free upon registration, a $349 value!

ISA One features the classic vintage microphone pre-amplifier topology from the original ISA110 module, including the Lundahl L1538 transformer and bespoke zobel network. (The original 110 preamp formed the cornerstone of each channel of Focusrite's legendary Forte console.)

The pre-amp is complemented by a line input (XLR and TRS Jack) and an independent D.I. channel, complete with dedicated gain control, active or passive impedance switch, a TRS Jack output for routing to an amp and an independent XLR output on the rear. This flexible independent D.I. makes the ISA One ideal both for engineers wishing to blend a D.I.’d guitar signal with a mic’d guitar cabinet, and for demanding performers who require a single classic solution for both guitar and vocals.

A variable impedance circuit has been added, allowing the user to switch between four carefully selected input impedance settings. In addition to the original ISA110 impedance, three further impedance settings allow perfect matching or creative mismatching of the preamp with any microphone. ISA One also features an insert point, should the need arise to place extra processing between the pre amp or D.I. and the optional converter. Phantom power, phase reverse, and a 75Hz, 18dB/octave high-pass filter are also available from the angled front fascia.

Independent input metering for both channels is provided in the form of a moving coil VU meter with variable calibration to suit analog and digital recording media, alongside two six-LED peak meters; inputs can be metered either pre- or post-insert. The meter calibrations utilize all the same reference points as AVID's Pro Tools HD system, allowing an effortless line-up.

ISA One’s headphone output features a dedicated volume control, which delivers an external stereo cue mix, (a simple click track, or a stereo mix feed from an interface or a live console,) fed to the headphones via two TRS jack inputs on the rear of the unit.

An optional state-of-the-art stereo A-D converter is also available (the same card as used with the ISA430 Mk II), embodying cutting-edge conversion technology seated within Focusrite’s custom analog circuitry. This optional card can be retrofitted at any time and provides two channels of 24 bit/192kHz A-D conversion with a dynamic range of 119dB.

Features

  • ISA Series Transformer-based Pre-amplifier
  • Flexible Independent D.I. Channel
  • Switchable Impedance
  • Optional Stereo 192kHz ADC
  • Headphone Output with Volume Control
  • Dedicated Insert Point

Specifications

  • Mic Input Response:
    • Gain Range: 0dB to 60dB in 10dB steps +20dB of variable gain
    • Input Impedance, variable as follows: Low = 600Ω ; ISA110 = 1400Ω; Med =2400Ω; High =6800Ω (Switched impedance setting equivalent input impedance at 1kHz)
    • EIN (equivalent input noise): -126dB measured @ 60dB of gain with 150Ω terminating impedance and 22Hz - 22kHz band-pass filter
    • Noise at main output with gain at unity (0dB): -97dBu measured with a 22Hz - 22kHz band-pass filter
    • Signal to noise ratio relative to max headroom (9dBu): 106dB
    • THD at medium gain (30dB): 0.0009% measured with a 1khz -20dBu input signal and with a 22Hz - 22kHz band-pass filter
    • Frequency response at minimum gain (0dB): -.05dB down at 10Hz and -3dBdown at 125kHz
    • Frequency response at maximum gain (60dB): -3dB down at 16Hz and -3dB down 118kHz
    • CMRR: 98dB (Channel 1, 1kHz, maximum gain with +24dBu input)
    • Crosstalk Channel to Channel: with 10dB @ 1kHz input to chA, chB output = 104dBrA. With 10dB @ 10kHz input to ch A, ch B output =84dBrA
  • Line Input Response:
    • Gain range: -20dB to +10dB steps +20dB of variable gain
    • Input Impedance: 10k ohm from 10Hz to 200kHz
    • Noise at main output with gain at unity (0dB): -96dBu measured with a 22Hz - 22kHz band-pass filter
    • Signal to noise ratio relative to max headroom (24dBu): 120dB
    • Signal to noise ratio relative to 0dBFS (+22dBu): 118dB
    • THD @ unity gain (0dB): 0.001% measured with a 0dBu input signal and with a 22Hz - 22kHz band-pass filter
    • Frequency Response @ unity gain (0dB): -0.3dB down @ 10Hz and -3dB down at 200kHz
  • Instrument Input Response:
    • Gain range: 10dB to 40dB continuously variable
    • Input Impedance: High = greater than 1MΩ; Low = greater than 300kΩ
    • Noise @ minimum gain (+10dB): -92dBu measured with a 22Hz - 22kHz band-pass filter
    • Noise @ maximum gain (+40dB): -62dBu measured with a 22Hz - 22kHz band-pass filter
    • THD @ minimum gain (+10dB): 0.001% measured with a 10dBu input signal and with a 22Hz - 22kHz band-pass filter
    • Frequency Response @ 10dB gain with -10dB input: 10Hz-100kHz +/-0.6dB
    • Frequency Response @ 40dB gain with -40dB input: -2.5dB down @ 10Hz and 0dB @ 100kHz
  • High Pass Filter:
    • Roll off: 18dB per octave 3 pole filter
    • Fixed Frequency 75Hz measured at the 3dB down point
  • Meters:
    • Moving coil (MC) meter is factory calibrated to 0VU =+4dBu with 1kHz sine wave. 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 center detent being equal to +22dBu
    • Peak LED meters calibrated in the detent position for 0dBVFS =+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 are 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
  • Analog Channel Inputs:
    • Mic Input: XLR x 1
    • Line Input: XLR x 1 and TRS x 1
    • Instrument Input TRS jack: XLR 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
  • Physical:
    • Weight: 8.6lbs
    • Dimensions (W x H x D-top to bottom): 8.66" x 4.1" x 10"-11.4"

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

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Joseph V on 12/22/2017 Verified - This reviewer has purchased this product

Great Sound for the Money.

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