Focusrite ISA428 MKII 4-Channel Microphone Preamp

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Focusrite

Focusrite ISA428 MKII 4-Channel Microphone Preamp

Name: Focusrite ISA428 MKII 4-Channel Microphone Preamp
Brand: Focusrite
SKU: H77588000000000
Price: 1999.99 USD
Availability: InStock
Rating: 5 (1 reviews)

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Overview

Four classic ISA preamps with DI inputs and a premium eight-channel A-D converter option.

Focusrite's ISA mic preamps can be traced back to 1985, when console designer Rupert Neve was asked by Sir George Martin to create new modules for the console at AIR Montserrat. The modules he createShow More

Specs

ISA428 MKII 4-Channel Microphone Preamp Specifications:

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 ohm 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 ohm, 1,400 ohm, 2,400 ohm, 6,800 ohm

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: 10 kohm
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 = >1 mohm

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

Analog 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

Analog 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: 12.2 lb. (5.5 kg)
Dimensions (WxHxD): 480 mm x 88 mm x 280 mm, 19" x 3-1/2" x 11"

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Focusrite ISA428 MKII 4-Channel Microphone Preamp

Special Financing

Four classic ISA preamps with DI inputs and a premium eight-channel A-D converter option.

ISA428 MKII 4-Channel Microphone Preamp Specifications:

Questions & Answers

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