Focusrite proves that what was old is new again with the ISA One. Built on the topology of the original ISA 110 including the Lundahl L1538 transformer and bespoke zobel network, the ISA One continues the legacy of the legendary Forte console. There’s a mic/line input as well as a DI input with a variable impedance selector for sonic coloration, all packaged in an ultra-portable desktop unit. Packing the same amazing sound that put the Forte on the map all those years ago, the ISA One is poised to be a huge hit.

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. Both the D.I. channel and the mic pre can be used simultaneously - very cool!

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 utilize 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, 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.

MPN: ISA One
UPC: 815301005100

- Single Channel Original ISA Series Pre Amp in a portable metal Chassis
- Flight case included
- Selectable impedance, perfect for matching with any
- Insert point send and return
- 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