Built on the topology of the original ISA 110 including the Lundahl L1538 transformer and bespoke zobel network, the Focusrite ISA One is an excellent way to tap into the legacy of the legendary Forte console in an ultra-portable format you can take anywhere you need to record. Inputs for microphone, line-level, and direct instrument-level sources cover all of the bases.

A variable impedance selector also lets you dial in the warmth you want without sacrificing the clarity you need. Plus, the ISA One's DI and microphone level inputs run in parallel, so you can blend the direct signal of the instrument with the sound of the miked up amplifier - a killer trick for getting bass sounds that are both fat and punchy.

Legacy
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 preamp 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 miked guitar cabinet, and for demanding performers who require a single classic solution for both guitar and vocals.

Modern advancements
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.

Other features
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 utilize all the same reference points as Digidesign's Pro Tools HD system, allowing effortless line-up.

Outputs
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, 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.

Features:

• S
• Single Channel Original ISA Series Pre Amp in a portable metal Chassis
  
• Selectable impedance, perfect for matching with any microphone
  
• Direct Instrument inputs including high and low impedance options to provide a comprehensive DI solution
  
• Classic VU meter, Ladder LEDs too-all manner of metering, at source
  
• Cue mix stereo inputs
  
• Certificate of origin hand-signed by Phil Dudderidge included
  
• An optional 24 bit/192kHz A-to-D converter available

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