Page 16
Delta Series – Non-DSP Models Operating Instructions
Operating Your Amplifier: Rear Panel Sockets and Switches
Delta 40, 80, 100 Rear Panel
Delta 120 Rear Panel
1: Fan outlet: The variable speed fans suck air in through the front vents and out through the
back of the amplifier. Please see maintenance on page 18 for recommendations on how to
clean this and the front foam sections.
2: Channel output Speakon socket: Normal output is on pins 1+ hot, 1- cold. On quad
channel amplifiers,
(Delta 40, 80, 100)
Channel B’s output is also wired to this socket to
enable a single NL4 to provide both channels and to facilitate easier wiring in bridged mode.
Channel B is wired pins 2+ hot, 2- cold. Similarly channel C’s output Speakon socket carries
Channel D’s output. Check the table on the rear panel for details.
On dual channel amplifiers
(Delta 120)
the second pair of pins on the Speakon carry the same
channel again for greater current delivery.
3: Audio network connections: Four (two on Delta 120) additional inputs can be added to the
available input choices via the optional Dante network card.
4: Source select switch: This selects either the four analogue input XLRs or the output of the
network audio card as the audio source. It operates globally across all four channels (two on
a Delta 120). See page 18 for more information.
5/8: Bridged (mono) switch (3+4)/(1+2): Press this switch to run this pair of amplifier
channels in bridged mode. To run 1+2 bridged, press the switch on the far left of the panel,
beside channel A’s input XLR.
Bridging is NOT possible on the Delta 120.
6: Link switch: Press this switch to link the input of the channel to its immediate left.
Multiple channels may be linked using these switches so, for example, to link all outputs to
input A, press all three switches IN and use input A only. The front panel attenuators will still
operate independently when channels are linked. Linking is disabled in Network Audio mode
and Link LEDs will be extinguished.
7: Input XLR sockets: Connect signal inputs to these sockets, wired pin 2 hot, 3 cold, 1
ground. For sensitivity and impedance of these inputs, see the specifications on page 20.
All vents on front and rear of unit must not be obstructed.
Tous les passages sur avant et arrière de l'unité ne doivent pas être obstrués.
SERIAL NO.
OUTPUT
Class 3 Wiring
on Outputs
1 - AUDIO NETWORK - 2
DESIGNED AND
MANUFACTURED
IN ENGLAND BY
SERIES
OUTPUT
OUTPUT
OUTPUT
OUTPUT WIRING
CONNECTORS
BRI
D
GE
1+
1-
2+
2-
PI
N
N
U
M
BE
R
BRIDGE
3+4
BRIDGE
1+2
INPUT
LINK
INPUT
LINK
INPUT
LINK
SOURCE
SELECT
4
5
1
2
6
3
7
8
All vents on front and rear of unit must not be obstructed.
Tous les passages sur avant et arrière de l'unité ne doivent pas être obstrués.
SERIAL NO.
OUTPUT
Class 3 Wiring
on Outputs
1 - AUDIO NETWORK - 2
DESIGNED AND
MANUFACTURED
IN ENGLAND BY
SERIES
OUTPUT
INPUT
LINK
SOURCE
SELECT
OUTPUT WIRING
CONNECTORS
1+
1-
2+
2-
PI
N N
UM
BE
R
Class 3 Wiring
on Outputs
4
1
2
6
3
7
