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.
SPECIFICATIONS
MIC INPUTS
Frequency Response At Minimum Gain (0dB) (Mic)
-0.35dB at 20Hz and –3dB at 122kHz
Frequency Response At Maximum Gain (60dB) (Mic)
–2.5dB at 20Hz and –3dB 103kHz
Gain Range (Mic)
0dB to 60dB in 10dB steps, plus 0dB to 20dB continuously variable trim
Maximum Headroom (Mic)
7.4dBu
Noise EIN (Mic)
-126dB (measured at 60dB of gain with 150O termination and 20Hz/22kHz bandpass filter)
Noise At Main Output With Unity Gain (Mic)
-98dBu (measured with a 20Hz/22kHz bandpass filter)
SNR (Mic)
123dB (relative to max output 25dBu) 120dB (relative to 0dBFS ( 22dBu)
CMRR (Mic)
88dB
Input Impedance, Variable (Mic)
600O, 1400O, 2400O, 6800O
LINE INPUTS
Frequency Response At Unity Gain (0dB) (Line)
-0.3dB at 20Hz and –3dB at 94kHz
Gain Range (Line)
-20dB to 10dB in 10dB steps, plus 0dB to 20dB continuously variable trim
Maximum Headroom (Line)
25.4dBu
THD N (Line)
0.002 (measured with 4dBu input signal, 0dB gain setting, with a 20Hz/22kHz bandpass filter)
Noise At Main Output With Unity Gain (Line)
-91dBu (measured with a 20Hz/22kHz bandpass filter)
SNR (Line)
116dB (relative to max output 25dBu) 113dB (relative to 0dBFS 22dBu). Input Impedance: 10kO
Frequency Response At 10dB Gain (Instrument)
-0.2dB at 20Hz and 0dB at 200kHz
Frequency Response At 40dB Gain (Instrument)
-3dB at 20Hz and –3dB at 38.4kHz
INSTRUMENT INPUTS
Gain Range (Instrument)
10dB to 40dB continuously variable
Maximum Headroom (Instrument)
11.5dBu
Noise At Main Output With Minimum Gain ( 10dB) (Instrument)
-95dBu (measured with a 20Hz/22kHz bandpass filter)
Input Impedance (Instrument)
>1MO
HIGH PASS FILTER
Roll Off
18dB per octave 3 pole filter
Frequency Range
16Hz to 420Hz (continuously variable, measured at the 3dB down point)
FRONT AND REAR CONNECTIVITY
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
WEIGHT AND DIMENSIONS
Weight
5.5kg (12.2lbs)
Dimensions
480mm (W) x 88mm (H) x 280mm (D)
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