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Focusrite ISA One Classic Preamp

Code: 48366    Manufacturer Part No: MOIFONEA-UK   
Focusrite ISA One Classic Preamp
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(2 reviews)


Price excludes VAT

€364.65 (euros)

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ISA One Classic Preamp description:

Focusrite ISA One – a classic single-channel pre-amp.

ISA One delivers Focusrite's prestigious ISA transformer-based pre amp in a rugged and portable chassis, at a ground-breaking 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.

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.

Focusrite ISA One main features include:

  • Rugged and portable transformer-based pre amp
  • Line input (XLR and TRS Jack)
  • Independent D.I. channel
  • Insert Point
  • VU Meter
  • Six Led Peak meters
  • Headphone out with dedicated volume control
  • Optional Stereo A/D Converter provides two channels of 24 bit/192kHz A-D conversion with a dynamic range of 119dB.


Manufacturer: Focusrite

This page first created on: 14/01/2008

Customer Reviews

Oxford GB

Pros: +
Mic pre amp and instrument DI are fantastic. Easy to use and noticeable different in tonal quality compared to saffire pro 40 mic pre's, which are not bad at all. I haven't tried digital card yet, perhaps I'll get one from Father Christmas

Cons: -
Size, perhaps 1U rack mounted chassis would have been a better choice

This customer purchased the product in March 2013

Expertise/Experience: pro for 30 years
Music Style: all
midlands GB

great natural sound anyway, but the adjustable input impedance gives your mic strengths it wouldn't otherwise have. My SE Z5600 sounds great for male vocals naturally, but by increasing the input impedance on the preamp the tonal character of the mic shifts, subtly rolling off the low end and increasing the high end detail, great for most female vocals. Also acts as 'posh' DI for literally anything with a jack on the end. Great tool.

This customer purchased the product in August 2015