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Focusrite ISA 428 Pre Pack Preamplifier Mic Preamps

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20.00 LBS
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Product Description

Focusrite ISA 428

 signal processor is the perfect multi-channel front end for any professional DAW. Four classic Rupert Neve-designed, transformer-based preamps with switchable impedance and direct instrument inputs. An optional eight-channel 192kHz A/D converter, preceded by the all new proprietary Soft Limiter circuit, Focusrite ISA 428 provides the perfect path into your Pro Tools HD system.

The benefits of the ISA 428 Pre Pack preamp's topology include superb common-mode rejection, an excellent overload margin and, with Focusrite ISA 428's shared gain structure (20dB from the hand-wound transformer and up to 40dB from the amplifier), an extremely low noise floor and super-wide bandwidth (10Hz to 200kHz). This pre amp design of Focusrite ISA 428 is the cornerstone of Focusrite's signature "warm-yet-transparent" sound and the ISA 428 Pre Pack is a point of reference for any discerning audio professional.

In addition, the input stage of the ISA 428 Pre Pack 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 preamp with any microphone and maximize level, or use different settings creatively to shape the sound of the microphone being used. Should the need arise to place extra processing in between pre amp and conversion, insert points are also featured on every channel.Protecting the ADC, the ISA 428's Soft Limiter opto circuit is a new design from Focusrite, entirely preventing any digital overs, while minimizing the undesirable distortion that standard limiter circuits often generate.

Finally, adding the new A/D converter to the ISA 428 Pre Pack gives you cutting-edge conversion technology, encompassed within pristine Focusrite circuitry, providing eight conversion channels of the highest quality, at frequency rates of up to 192kHz. Running at 96kHz allows for up to 16 (2 x 8, parallel) simultaneous digital outputs in addition to the four main analog outputs. Digital output options of Focusrite ISA 428 include dual AES/EBU, SPDIF and dual ADAT lightpipe. Full digital metering is provided for every channel, alongside new "moving coil" peak meters, designed to catch even the fastest of transients.

Classic preamp technology, custom Focusrite input and limiting circuits and the very best in A/D conversion technology, the ISA 428 Pre Pack raises the bar for multi-channel recording solutions into Pro Tools HD, or any other professional DAW. Equally, Focusrite ISA 428 can be used as an additional set of high quality pre amps for any analogue or digital console or hard disk recorder.


Four classic Rupert Neve-designed transformer-based preamps

8 channels of cutting-edge A/D conversion, running at up to 192kHz

Focusrite ISA 428 is Protected by proprietary optical Soft Limiter circuit

Switchable Impedance for unparalleled mic matching or extended mic creativity - includes the classic ISA 110 setting

Multiple Front Panel Instrument DI. No separate DI box required

Analogue insert points on every channel

Rupert Neve-designed High Pass Filters on every channel

New moving coil peak meters & full digital metering (dBfs)


Number of Channels: 4

4 x XLR
4 x 1/4" TRS phone (rear)
4 x 1/4" TS phone (front)
4 x 1/4" TRS phone insert return

4 x XLR
4 x 1/4" TRS phone insert send

Phantom Power: +48V

Multi Function: No

Gain Range
Line: +/-18dB (in 6dB steps)
Mic: 0 to 60dB (in 6dB steps)
Inst: +10 to +40dB variable

Maximum Output Level: Not specified by manufacturer

Frequency Response
Frequency response at maximum gain (60dB) : -2.5dB down at 20Hz and -3dB down 120kHz (mic pre)

Line: -96dB
Mic: -128dB (EIN with 150 Ohm input resistance at 60dB of gain)

Dimensions :2U, 19" rack mount

Specialties: Optional eight channel 24-bit 192kHz A/D converter with dithering to 20 or 16-bits

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