Legend-audio ISA 828 User Manual download pdf (Page 8)

Mode 2. Meters Pre ADC switch engaged

This is the mode to use when the analogue input signals are being routed to other hardware devices (such as dynamics

processors) using the analogue outputs/ADC Input on the rear panel (acting as sends/returns) before converting to

digital. Obviously, the optional digital output card should be installed if wanting to use this mode. Meters 1 to 8 indicate

the peak level of channels 1-8 received at the ADC Input. 0dBFS (reached when the red LED is lit) indicates that a signal

level of +22dBu is present at the ADC Input connector. -18dBFS (unless recalibrated on the rear panel, see description

below) therefore indicates that there is a signal level of +4dBu at the ADC input connector.

Meter Calibration

A Trim dial on the rear panel allows the meters to be calibrated so that a different peak level is set. See the TRIM

section on page 9 for details.

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, relating to analogue

inputs 1-4. 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. The high and low impedance settings available on the instrument input,

allow a better match to be achieved with different output impedances of various instruments.

All 1/4” unbalanced jack connections are wired as follows:

Tip: Audio 0°

Sleeve: Screen/Chassis

Sample rate and clock select

The last section allows the sample rate and clock source of the digital output card (if fitted) to be selected. See the

Digital Options section on page 10 for details.

Rear Panel

Optional digital card connections

Analogue Outputs

1-8, 25-pin, D-type

Balanced Line Inputs

1-8, TRS Jack

Analogue Inputs

Mic Inputs 1-8, XLR

Mains IEC connector

TRIM dial: Calibrates the

meters on the front panel

ADC Inputs 1-8, 25-pin, D-type

(each input is activated by Insert

switches on the front panel)

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 20 21

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Legend-audio ISA 828 User Manual Page 8