Focusrite ISA One

Focusrite ISA One

The ‘ISA One’ microphone pre-amplifier delivers Focusrite´s prestigious ISA transformer-based pre-amp in a ruggedportable chassis, at a groundbreaking price.

ISA One features the classic vintage microphone pre-amplifier topology from the original ISA110 module, including the Lundahl L1538 transformerbespoke 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 (XLRTRS Jack)an independent D.I. channel, complete with dedicated gain control, activepassive impedance switch, a TRS Jack output for routing to an ampan 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,for demanding performers who require a single classic solution for both guitarvocals.

A variable impedance circuit has been added, allowing the user to switch between four carefully ed input impedance settings. In addition to the original ISA110 impedance, three further impedance settings allow perfect matching,creative mismatching of the pre amp with any microphone. ISA One also features an point, should the need arise to place extra processing between the pre ampD.I.the optional converter. Phantom power, phase reversea 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 analoguedigital recording media, alongside two six-LED peak meters; inputs can be metered either pre-post-. 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,a stereo mix feed from an interfacea 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 timeprovides two channels of 24 bit/192kHz A-D conversion with a dynamic range of 119dB.