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13. Set-up and operation

LUCIA Operation Manual rev 1.0.0

13. Set-up and operation

13.1. Auto standby / Power-up

LUCIA ampliers do not have a power switch. The amplier will turn on automatically when AC power is connected

to the unit; it will go into standby mode if no signal is present at any input for 20 minutes. When in standby, the

amplier will power up in 0.9 seconds when a signal above the preset threshold (-54 dBu default) is present at any

channel input.

In order to avoid issues with the signal being too low relative the threshold it is generally better to use full level from

the source and to reduce the gain in the LUCIA instead using the front controls, GPI or in the matrix.

13.2. GPIO conﬁguration

All LUCIA models provide the default functionality described below for General Purpose Inputs and Output (GPIO).

Remote volume control – The default functionality for the GPI is independent control of output volume (output 1

on GPI1 and output 2 on GPI2). Please note that this control is in series with the control on the front panel. There

are two ways to do this:

A. Connect a GPO from an external control device with a control voltage output of 0 – 3.3 V. The ground of the

control device must be connected to the ground pin of the LUCIA GPI connector.

B. Connect a remote volume control potentiometer per channel to pins 1 through 4 of the GPIO connector as

shown below. (The VCC voltage output is 3.3 V). If you want the link the control, then you simply link GPI1 and

GPI2 together with a jumper cable.

Individual volume control

Common volume control

Amplier status – Pins 5 and 6 connect to an internal relay to provide amplier fault indication. The relay is closed

when the amplier is on and operating normally. The relay opens if a fault in either channel or in the power supply

interrupts normal operation of one or both channels.

Optional GPIO modes – The Matrix models allow other GPIO functions to be enabled by applying changes to the

amplier rmware. See “Matrix Block” in Section 14.5.2.2.

Lab.gruppen LUCIA Series User Manual

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