Audio Inputs - JBL Intellivox-DC115 Installation Manual

JBL Intellivox Installation Manual

AUDIO INPUTS

The Intellivox is normally supplied with two transformer-
balanced line inputs. Selection of Input 1 or Input 2 as audio
source is made from the WinControl software via the
network, and for most installations only Input 1 need be
wired. However, Input 2 may be connected to a secondary
signal path (in case of a failure elsewhere in the system), or
to an emergency sound source.
For optimum results only use good quality balanced audio
cable consisting of a twisted pair and an overall screen. The
audio source(s) (e.g. the Octadrive) should have a low
impedance balanced output. The nominal line input level
is 0 dBV.
For applications requiring direct connection to a 70 V/100 V
distributed loudspeaker system the Intellivox may be
ordered with an alternative input module having either
one 70 V/100 V audio input and one 0 dBV line level input
or two 70 V/100 V inputs. Refer to Appendix for order codes.
The audio connector pinout is as follows:
1 2 3 4 5 6
fig.8.1 - Audio input connections
PIN NO. STANDARD VERSION
1 Line 1 +
Line level
2 audio input 1 Line 1 -
(0 dBV)
3 Line 1 Screen
4 Line 2 +
Line level
5 audio input 2 Line 2 -
(0 dBV)
6 Line 2 Screen
*A simple failure monitoring scheme based on impedance switching can be implemented on this 70 V/100 V input.
Refer to the Appendix (page 25) for details.
201401/IvxIM_v2.2
or
6 5 4 3 2 1
1 X 70 V/100 V
1 X LINE VERSION
70 V/100 V +
70 V/100 V
70 V/100 V -
input*
GND (n/c)
Line +
Line level
audio input Line -
(0 dBV)
Line Screen
If the source equipment has a well-designed balanced
output and the wiring strategy shown below is used, there
should be no problems with hum or other extraneous noise.
Note that pins 3 and 6 of the audio connector are analogue
audio grounds, they should be used only for connecting the
screen of the audio cables, and for no other purpose.
1
3
2
Balanced source
output (e.g. XLR)
fig.8.2 - Balanced audio
connections
Due to the complex architecture of some large audio
systems, unexpected hum or noise may occur due to ground
loops, or injected noise from other equipment elsewhere in
the system. If this occurs, please refer to the Appendix (p24)
and to our website, where additional guidance on grounding
strategies will be found, with general techniques that may
be applied in order to reduce ground-induced noise.
DUAL 70 V/100 V
VERSION
70 V/100 V +
70 V/100 V
70 V/100 V -
input*
GND (n/c)
70 V/100 V +
70 V/100 V
70 V/100 V -
input
GND (n/c)
LINE 1+
1
LINE 1 -
2
LINE 1 SCN
3
4
5
6
Intellivox line level
audio input
(Line 1 only shown)
11