Key Features
• Four ISA-series transformer-based pre-amps
The benefits of Focusrite’s classic pre-amp topology include superb common-mode rejection, an excellent overload margin, an extremely low noise floor and super-wide bandwidth.
• Dedicated analogue insert points
Switchable insert points are also featured on every channel, allowing routing (between pre-amp and output) to additional external processing.
• Accurate ‘moving coil’ peak meters
Clear metering designed to catch even the fastest and most elusive of transients.
• Four front panel instrument inputs
Instant access on the front fascia and no separate DI box required.
• Eight line inputs
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.
• Eight Channel optional 192kHz A/D conversion card
With the additional four ADC inputs, two ISA428’s can be used with a single ADC, providing eight channels of pre-amplification, A-D conversion and VU metering.
• Custom Global A-D converter ‘soft clip’ limiter
Focusrite’s custom optical design protects the A-D converter by preventing ‘digital overload’. It requires that an A-D converter be installed.
• Switchable Impedance
Ideal for mic matching or extended microphone creativity. Settings include the ‘Vintage ISA110’ setting, providing the original Focusrite signature sound.
• Variable Focusrite high pass filter
Provided on every channel, this is the same filter as featured on the original ISA110 and the Focusrite forte console.
• Specifications
• Inputs
• Transformer-based ISA design
• Gain range: Line = +/- 18dB, Mic = 0 to 60dB (both in 6dB steps), Inst = +10 to +40 dB variable
• Input impedance: Line = 10k ohm, Mic = Variable - 600, 2k4 and 6k8 ohm + original ISA 110 settings, Inst = >1M ohm
Analogue Performance
• Noise: Line = -96dB, Mic = -128dB (EIN with 150 ohm input resistance at 60dB of gain)
• THD: Line = 0.003% with 0dBu, 1kHz input and 20Hz to 22kHz band-pass filter, Mic = 0.003%
Analogue Input and Output connectors (balanced)
• D.I inputs: 1/4 inch Jack (unbalanced)
• Mic inputs: XLR (balanced)
• Line: TRS Jack (balanced)
• Insert Sends and Returns: TRS Jack (balanced)
• Additional ADC inputs: XLR (balanced) Line level
• Analogue Outputs: XLR (balanced)
Digital Output Option
• AES/EBU and S/PDIF dual 9-pin D-types
• Optical - ADAT Lightpipe
• Bit depths 16-, 20- or 24-bit
• Frequency options 44.1, 48, 88.2, 96, 176.4 and 192kHz
• Clock options Standard or ?256 x?
• Meter - 0 dBFS = +22dBu
• Digital Performance
• SNR - 120dB A-weighted
Weight
• 7.36kg
• 16.2Ibs
Dimensions
• 484mm (W) x 85mm (H) x 250mm (D)
• 19" (W) x 3.5" (H) x 9.8" (D)
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