Focusrite ISA 428 MkII 4-Channel Microphone & Instrument Preamp

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SKU:
ISA428MK2
UPC:
815301005124
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Weight:
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  • Focusrite ISA 428 MkII 4-Channel Microphone & Instrument Preamp
  • Focusrite ISA 428 MkII 4-Channel Microphone & Instrument Preamp
  • Focusrite ISA 428 MkII 4-Channel Microphone & Instrument Preamp
$1,749.99

Description

Four Classic Mic Pres

ISA 428 MkII incorporates four of Focusrite's renowned mic pres in a simple-to-operate 2U enclosure, placing four mic preamps, instrument inputs and line ins at your fingertips. The original Focusrite mic pre was designed to suit the microphones of the time; today's model makes one small change, adding three additional input impedances to the classic ISA 110 setting, allowing you to match any microphone, old or new, and access a wide range of sounds, from the character and warmth of a vintage mic to the clear transparency of a modern design.

Each mic pre has the option of mic, line or the front-panel instrument input, with variable input impedance to ensure you are getting the best performance from the source. Up to 60dB of gain is available on the four-position rotary and gain range switches, with a further +20dB of continuously variable trim, meaning a huge 80dB of gain is available should it be required. The high-pass filter features variable cut-off frequency between 16 and 420Hz. An array of 6-segment LED meters show peak signal level for the four mic pres, in addition to the four direct inputs to the optional A-D card. Switchable rear-panel insert points allow the use of inline processors such as compression.

Features

  • Classic ISA mic preamp design featuring Lundahl LL1538 input transformer
  • Switchable input impedance including classic ISA 110 setting
  • Dedicated switchable insert point
  • Optional A-D card with up to 192kHz, 24-bit sampling via ADAT or AES3
  • Instrument and line inputs with dedicated input connectors and front-panel switch
  • Variable cut-off frequency high-pass filter
  • Per-channel six-segment LED peak-level meters
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Specifications

Mic Inputs

  • Frequency response at minimum gain (0dB): -0.35dB at 20Hz and ‰ÛÒ3dB at 122kHz
  • Frequency response at maximum gain (60dB): ‰ÛÒ2.5dB at 20Hz and ‰ÛÒ3dB 103kHz
  • Gain range: 0dB to +60dB in 10dB steps, plus 0dB to +20dB continuously variable trim
  • Maximum headroom: +7.4dBu
  • THD+N: 0.0009% (measured at 1kHz -20dBu input signal, at 30dB gain setting, with a 20Hz/22kHz bandpass filter)
  • Noise EIN: -126dB (measured at 60dB of gain with 150ë© termination and 20Hz/22kHz bandpass filter)
  • Noise at main output with unity gain: -98dBu (measured with a 20Hz/22kHz bandpass filter)
  • SNR: 123dB (relative to max output 25dBu)
  • SNR: 120dB (relative to 0dBFS (+22dBu)
  • CMRR: 88dB.åÊ
  • Input Impedance, variable: 600ë©, 1400ë©, 2400ë©, 6800ë©

Line Inputs

  • Frequency Response at unity gain (0dB): -0.3dB at 20Hz and ‰ÛÒ3dB at 94kHz
  • Gain range: -20dB to +10dB in 10dB steps, plus 0dB to +20dB continuously variable trim
  • Maximum headroom: +25.4dBu
  • THD+N: 0.002% (measured with +4dBu input signal, 0dB gain setting, with a 20Hz/22kHz bandpass filter)
  • Noise at main output with unity gain: -91dBu (measured with a 20Hz/22kHz bandpass filter)
  • SNR: 116dB (relative to max output 25dBu)
  • SNR: 113dB (relative to 0dBFS +22dBu). Input Impedance: 10kë©

Instrument Inputs

  • Frequency Response at +10dB gain: -0.2dB at 20Hz and 0dB at 200kHz
  • Frequency Response at +40dB gain: -3dB at 20Hz and ‰ÛÒ3dB at 38.4kHz
  • Gain range: +10dB to +40dB continuously variable
  • Maximum headroom: +11.5dBu
  • THD+N: 0.006% (measured with ‰ÛÒ20dBu input signal, at minimum gain (+10dB), with a 20Hz/22kHz bandpass filter)
  • Noise at main output with minimum gain (+10dB): -95dBu (measured with a 20Hz/22kHz bandpass filter)
  • Input Impedance = >1Më©

High Pass Filter

  • Roll off = 18dB per octave 3 pole filter
  • Frequency range: 16Hz to 420Hz (continuously variable, measured at the 3dB down point)

Meters

6 LED meter is calibrated 0dBFS = +22dBu (the maximum level which can be correctly converted by the optional internal A/D converter before overload occurs). The meter calibration points are as follows:

  • Meter panel calibration value in dBFS / Equivalent dBu value
  • 0dBFS / +22dBu
  • -2dBFS / +20dBu
  • -6dBFS / +16dBu
  • -12dBFS / +10dBu
  • -18dBFS / +4dBu
  • -42dBFS / -20dBu

Front and rear connectivity

Analogue Channel Inputs (Inputs 1-4)

  • 4 instrument 1‰ã4‰Û TS jack inputs on front panelåÊ
  • 4 microphone XLR inputs on rear panelåÊ
  • 4 line 1‰ã4‰Û TRS jacks on rear panelåÊ
  • 4 insert return 1‰ã4‰Û TRS jacks on rear panel
  • 4 ADC XLR inputs on rear panel

Analogue Audio Outputs (Outputs 1-4)

  • 4 line XLR outputs on rear panelåÊ
  • 4 insert send 1‰ã4‰Û TRS jacks on rear panel

Other I/O

  • IEC power input connector 100Vac ‰ÛÒ 240Vac

Front Panel Indicators

  • 8 output meters, 6 segmentåÊ
  • 4 30-60 mic gain range selection indicatoråÊ
  • 4 +48V phantom power indicatoråÊ
  • 4 Phase indicatoråÊ
  • 4 Insert In indicatoråÊ
  • 4 Filter In indicatoråÊ
  • 4 Input selection indicators (Mic, Line, Inst)åÊ
  • 4 Z In microphone input impedance selection indicators (Low, ISA110, Med, High) Clock select indicators (44.1, 48, 88.2, 96, 176.4, 192)åÊ
  • Ext clock indicators (Lock, Word clock, 256X)

Weight

  • 5.5kg
  • 12.2lbs

Dimensions (W x H x D)

  • 480mm (W) x 88mm (H) x 280mm (D)
  • 19" (W) x 3.5" (H) x 11" (D)
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