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Focusrite ISA428 MKII
Focusrite ISA428 MKII
Focusrite ISA428 MKII

Focusrite ISA428 MKII

  • SKU: W-REB015X
£1,082.00
  +VAT
Price Match

Focusrite ISA428 MKII, 4-channel Pre Pack Preamp

The ISA428 MkII provides four of Focusrite's prestigious transformer-based microphone preamps. It features the same classic circuitry and renowned audio quality found in the original at a new level of affordability. With selectable input impedance, direct instrument inputs and an optional eight channels of high-quality analogue to digital conversion, the ISA428 MkII creates the perfect front end for the discerning recording professional.

Mic Inputs

  • Frequency response at minimum gain (0dB): -0.35dB at 20Hz and '3dB at 122kHz
  • Frequency response at maximum gain (60dB): '2.5dB at 20Hz and '3dB 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 150' 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. 
  • Input Impedance, variable: 600', 1400', 2400', 6800'

Line Inputs

  • Frequency Response at unity gain (0dB): -0.3dB at 20Hz and '3dB 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: 10k'

Instrument Inputs

  • Frequency Response at +10dB gain: -0.2dB at 20Hz and 0dB at 200kHz
  • Frequency Response at +40dB gain: -3dB at 20Hz and '3dB at 38.4kHz
  • Gain range: +10dB to +40dB continuously variable
  • Maximum headroom: +11.5dBu
  • THD+N: 0.006% (measured with '20dBu 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 = >1M'

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 1/4' TS jack inputs on front panel 
  • 4 microphone XLR inputs on rear panel 
  • 4 line 1/4' TRS jacks on rear panel 
  • 4 insert return 1/4' TRS jacks on rear panel
  • 4 ADC XLR inputs on rear panel

Analogue Audio Outputs (Outputs 1-4)

  • 4 line XLR outputs on rear panel 
  • 4 insert send 1/4' TRS jacks on rear panel

Other I/O

  • IEC power input connector 100Vac - 240Vac

Front Panel Indicators

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

Weight:

5.5kg

Dimensions (W x H x D):

480mm (W) x 88mm (H) x 280mm (D)

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