Focusrite ISA428 Four Classic Microphone Pre-Amps and High-Quality A/D Conversion

Focusrite ISA428 Four Classic Microphone Pre-Amps and High-Quality A/D Conversion Review

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Focusrite ISA428 Four Classic Microphone Pre-Amps and High-Quality A/D Conversion Feature

• Four ISA-series transformer-based pre-amps, include superb common-mode rejection, excellent overload margin, extremely low noise floor and superwide bandwidth
• Dedicated analogue insert points featured on every channel allowing routing to additional external processing
• Accurate 'moving coil' peak meters catch even the fastest and most elusive of transients
• Four front panel instrument inputs, no separate DI box required
• Four additional A-D converter inputs combine with the four pre-amp inputs to provide eight line inputs, routable discretely to the eight-channel A-D converter option.
• Include superb common-mode rejection, excellent overload margin, extremely low noise floor and superwide bandwidth
• Four additional A-D converter inputs combine with the four pre-amp inputs to provide eight line inputs
• Accurate moving coil peak meters catch even the fastest and most elusive of transients

The ISA 428 features four classic, transformer-based microphone pre amps with switchable impedance and direct Instrument Inputs are combined with an optional eight channel 192kHz ADC. An all-new, Soft Limiter circuit precedes the A/D, providing the perfect path into any DAW, Digital Console or direct to Hard Disc Recorder. The input stage provides enhanced control and creativity allowing you to switch between four carefully selected input impedance settings. The original ISA 110 setting is supplemented by three further impedance settings to either perfectly match the pre-amp with any microphone and maximise level, or to use different settings creatively to shape the sound of the microphone being used. Should the need arise to place extra processing between pre-amp and conversion, insert points are also featured on every channel. Protecting the ADC, Focusrite's Soft Limiter is a new optical circuit design, entirely preventing any digital overs, whilst reducing to an absolute minimum the undesirable distortion artefacts that common limiter circuits typically generate. This limiter requires the optional ADC to be fitted in order for it to operate. The ADC embodies cutting-edge conversion technology, encompassed within Focusrite circuitry, providing eight high quality conversion channels, at sampling frequency rates of 44.1, 48, 96 and 192kHz. Running at 96kHz allows for up to 16 (2 x 8, parallel) digital outputs. Digital output formats are dual 9-pin D-sub (AES/EBU, SPDIF) and dual ADAT light-pipe. Full digital metering is provided for every channel, alongside moving coil peak meters, designed to catch even the fastest transients. A second ISA428 analogue unit can be connected utilising the four extra ADC input channels on the rear of the unit containing the optional ADC. This makes full use of the eight channels provided and expands front-end capacity from four pre amps and eight digital outputs to eight Pre amps and eight digital outputs.

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Aug 02, 2011 18:05:04