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Focusrite ISA428 MkII 4 Channel Mic Preamp

  • Dale #:

    FOPR-ISA428MK2
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Description

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 c... Read More

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Description

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.

First introduced in 1985, the ISA microphone preamp holds a reputation for outstanding transparency along with subtle warmth contributed by transformer core saturation. The addition of a variable impedance circuit allows ISA users to perfectly match the preamp with any microphone, or to use different settings creatively to shape the sound of the microphone. Unchanged for decades, the ISA microphone preamp topology offers incredible clarity and the signature Focusrite sound that makes it the top choice among many audio professionals today.

Features:

  • Four ISA series transformer-based preamps
  • Eight-channel optional A-D converter
  • Selectable impedance
  • Four front panel instrument inputs
  • Dedicated analogue insert points
  • Variable high-pass Focusrite filter
  • Accurate LED meters for every channel

Red, RedNet, and ISA customers get a free plug-in from Focusrite and Brainworx!
Brainworx bx_console Focusrite recreates the analogue signal paths of Focusrite’s revered ISA 110 and ISA 130 modules which were a part of the Focusrite Studio Console.

Designed and coded by the DSP geniuses at acclaimed software house Brainworx, the new bx_console Focusrite VST/AU/AAX plugin for Mac and PC faithfully captures the sound, feel and styling of our original iconic hardware.

With bx_console Focusrite retailing separately for $349, its inclusion for free with all Red, RedNet, and ISA purchases is a huge deal!

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Product Specs

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 range0dB to +60dB in 10dB steps, plus 0dB to +20dB continuously variable trim
Maximum headroom+7.4dBu
THD+N0.0009% (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 150Ω termination and 20Hz/22kHz bandpass filter)
Noise at main output with unity gain-98dBu (measured with a 20Hz/22kHz bandpass filter)
SNR123dB (relative to max output 25dBu)
SNR120dB (relative to 0dBFS (+22dBu)
CMRR88dB
Input Impedance, variable600 Ohms, 1400 Ohms, 2400 Ohms, 6800 Ohms
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+N0.002% (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)
SNR116dB (relative to max output 25dBu)
SNR113dB (relative to 0dBFS +22dBu).
Input Impedance10k Ohms
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+N0.006% (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 Ohms
High Pass Filter
Roll off18dB per octave 3 pole filter
Frequency range16Hz to 420Hz (continuously variable, measured at the 3dB down point)
Weight5.5kg
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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