Hardware Overview - Front Panel; Power; Instrument Inputs; Analogue/Adc Dbfs Output Meters - Focusrite ISA428 MkII Mode D'emploi

Hardware Overview - Front Panel

Power

Applies power to the unit. Turn on the ISA428 MkII before powering up devices to which the outputs are connected.

Instrument inputs

Instrument sources may only be connected via the front panel. Four unbalanced Instrument input connectors
are located to the far left of the front panel and are numbered 1-4, correlating to each of the four channels.
These connectors are used primarily for connecting low level unbalanced signals such as those from passive
guitars and basses, or from active instruments such as keyboards and electro-acoustic guitars.

Analogue/ADC dBFS output meters

These vertical columns of LEDs indicate the peak signal levels of channels 1-8 in one of the two following
modes:
Mode 1. Analogue only unit (no optional ADC card fitted).
Meters 1 to 4 indicate the analogue level at the ISA428 MkII XLR output connectors for channels 1 to 4. 0dBFS (reached when the red
LED is lit) indicates that a signal level of +22dBu is present at the output. Therefore –18dBFS indicates that there is a signal level of
+4dBu at the output. Meters 5 to 8 have no function in this mode.
Mode 2. Digital (optional ADC card fitted).
Meters 1 to 8 indicate the signal level that exists in the signal path just before the point of conversion on the optional ADC card.
0dBFS (reached when the red LED is lit) indicates the maximum signal level that can be converted by the optional ADC card and
should only be lit for very short durations to ensure a good quality recording with no digital overload.
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