Focusrite_ISA428MkII_Specs.pdf
Focusrite ISA 428 MkII Technical 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 150Ω
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: 600Ω, 1400Ω, 2400Ω, 6800Ω
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:
10kΩ
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 = >1MΩ
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
• 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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