User Guide

Page 22UG10637-1.0 - Inca 500 User Guide V1.0

6 Connections

6.1 Mains Power Connection

Inca 500 ampliﬁers incorporate a power factor corrected universal power supply and can

be used with mains input voltage from 100V AC to 240V AC, 50/60Hz. Use the mains cable

supplied with the ampliﬁer.

Inca 500 ampliﬁers have no mains power switch and are operational as soon as mains

power is connected. Ensure that all signal, GPIO and output connections are made before

connecting the ampliﬁer to mains power.

6.2 Input Connection

All Inca 500 ampliﬁer models provide four balanced or unbalanced analog audio inputs and

a stereo S/PDIF digital audio input. Any input channel can be routed to any output channel.

Input routing options can be conﬁgured via the ampliﬁer network interface. See Section 5

of this manual.

Analog Inputs

Inca 500 analog inputs are of line level format with a default input sensitivity of +4dBu (full

output voltage swing/sensitivity) in all output modes. Input signal levels up to +24dBu can

be handled without input clipping. Input sensitivity options can be set via the ampliﬁer net-

work interface. See Section 5 of this manual.

Balanced input connections to the ampliﬁers are made via male ‘Euro Block’ connectors.

Connecting cables to the supplied female input connectors is illustrated in ﬁgure 6.2.

Unbalanced input connections to the ampliﬁers are made via RCA phono sockets.

Digital Inputs

Inca 500 S/PDIF stereo digital audio input connections are made via a single RCA Phono

socket

Note: An S/PDIF digital audio output socket is also ﬁtted. The S/PDIF output signal by

default reﬂects the input to ampliﬁer installation zones A & B and is intended to be used for

daisy-chaining Inca 500 ampliﬁers.

Note: 75Ω RCA Phono cables speciﬁcally intended for digital audio should always be used

for S/PDIF connections.

6.3 Output Connections

Output connections from the ampliﬁers are achieved via male ‘Euro Block’ connectors.

Ensure that speaker connection polarity is correct throughout the installation:

In the case of Lo-Z speaker connections, positive (+) ampliﬁer terminals should always

be connected to positive speaker terminals and negative (–) ampliﬁer terminals always

connected to negative speaker terminals.

In the case of Hi-Z speaker connections, the two speaker cable conductors should be

connected between the positive (+) terminal of Output 1 and the negative terminal (-) of

Output 2, and likewise for Outputs 3 and 4.