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Focusrite ISA One Analogue
Pre Amp

MPN: MOIFONEA-UK
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  • 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

View all Focusrite ISA.

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.

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 pre amp 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 pre amp 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 analogue and digital recording media, alongside two six-LED peak meters; inputs can be metered either pre- or post-insert. The meter calibrations utilise all the same reference points as Digidesign's Pro Tools HD system, allowing 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 analogue 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.

View product on the Focusrite website.

Please note that these videos are dynamically generated by means of a Youtube search for the phrase "Focusrite ISA One Analogue" to save you time searching Youtube yourself. As such, the views expressed may not be those of Red Dog Music Limited, any product features or specifications quoted should be confirmed with Red Dog Music staff prior to ordering, and the content may not always be relevant to the product shown on this page.

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    • 1/4" High Z input on the front panel
    • Selectable plate Voltage
    • Smooth musical sounding Optical Compressor
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    • Auto/Manual Attack/Release switch
    • Parametric EQ
    • Large VU and LED meters
    • Toroidal power transformer for low noise
    • Selectable Source switches for VU signal monitoring of any section of the unit
    • Two insert loops
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    • XLR input and output
    • DI input
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    • 20dB pad, phantom power and polarity invert
    • Frequency response 10 Hz-50 kHz
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    • S/N -82dBA at maximum (+50dB) gain, 10-24 kHz bandwidth
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    • XLR input and output
    • DI input
    • 12 position stepped gain control, 20-60dB
    • Trim control, for fine adjustment of gain
    • 20 dB pad, +48V phantom power and polarity invert
    • Frequency response 20 Hz-60 kHz
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    • Continuously variable gain control
    • Front panel instrument input
    • DC coupled ribbon mic with 10dB gain boost setting
    • 80 Hz rolloff filter
    • 48V phantom power
    • 15 dB Pad
    • Polarity flip
    • 12 to 15V operation - 100 to 240V line lump power supply, 12V output, included
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    • Provides Superior Preamplification for: Microphones, Instruments and Line Level Sources
    • V3 - Variable Valve Voicing
    • OPL - Output Protection Limiting
    • Hand Selected 12AX7a Provides 70dB of Gain Smooth, Warm and Fat Sound Quality
    • Variable Input and Output Gain Controls
    • Excellent as a Tube DI
    • XLR and 1/4" Inputs and Outputs +48 volts
    • +48 Volts of Phantom Power
    • Phase Reversal Switch
    • Superior Sonic Performance to On-Board Preamps
    • TEC-Award Nominated Design
    • Portable, All Steel Construction
Available to order (more info)
Usually delivered within 7 working days
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  • 14-day money-back guarantee
  • For all items ordered online or over the phone, we offer the statutory 14 day “cooling off period”. This means that if you are unhappy with the goods for whatever reason, you can return them for a full refund within this period.

    Please note, however, that certain items are exempt from this – see our Terms and Conditions for more info.

  • Extended seasonal exchange
  • Items bought 1st November 2017 to 24th December 2017 are eligible for our Extended Christmas Exchange and can be exchanged until Wednesday 31st January 2018.

  • 1 year warranty
  • This product comes with a 1 year warranty as standard.

    Please note that you will need to register your product with the manufacturer to qualify for any warranty beyond 12 months.

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