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XPA U Full Rack Series Audio Power Amplifiers • Setup Guide (Continued)
Output Mode Selection Switch (see
6
This switch determines the function of each amplifier channel. There are six settings: two low-impedance
(8 ohms, 4 ohms) and four high-impedance modes.
Low-Impedance Modes (8 ohm/4 ohm):
The 8 ohm stereo setting is used when connecting to 8 ohm speaker loads, and the 4 ohm setting is used
when connecting to 4 ohm loads.
High-Impedance Modes:
There are four high-impedance modes available: 70V, 70V (HPF OFF), 100V, 100V (HPF OFF). These modes are used
•
when connecting to distributed 70 volt or 100 volt loudspeaker systems.
In the 70V and 100V modes, an 80Hz, 12 dB/octave high-pass filter is applied to the signal, to prevent saturation of the
•
transformer cores in the speakers.
In the 70V (HPF OFF) and 100V (HPF OFF) modes, the high-pass filter is disabled. The (HPF OFF) modes should only be
•
used when a high-pass filter will be applied in a DSP upstream of the amplifier.
Connections
Speaker output connectors (see
7
Wire the speakers to the amplifier output using the included 2-pole, 5.08 mm captive screw connectors
(see figure 4,
A
). Each port has a screw flange to secure the plug to the connector (
A
Do not tin the wires!
Figure 4.
Connecting Speaker Outputs
ATTENTION:
•
Do not tie channel output pins to each other or to ground. Doing so will short out the outputs, damage the
amplifier, or both.
•
Ne pas lier les sorties 1 et 2 des canaux entre elles ou à la terre. Les sorties pourraient être court-circuitées et/ou
l'amplificateur pourrait être endommagé.
•
To avoid risk of damage to the amplifiers or speakers, ensure that the amplifier output mode selection switch for
each channel is properly configured to match the type of speaker load about to be connected to the particular
output.
•
Pour éviter tout risque de détérioration des amplificateurs ou des enceintes, assurez-vous que le switch de
sélection du mode de sortie de l'amplificateur est correctement configuré pour s'adapter au type de charge de
l'enceinte qui sera connectée à la sortie donnée.
NOTE:
You must use Class 2 wiring for this output to comply with UL requirements.
Line inputs (see
figure
8
Use 5-pole 3.5 mm captive screw connectors to input four (XPA U 2004 FX) or eight (XPA U 2008 FX) channels of balanced or
unbalanced line-level audio signals through these connectors.
Wire the source output to the captive screw connectors as shown in the following illustrations.
Tip
Ring
Sleeves
Tip
Ring
Balanced Stereo Input
4
figure 3
on page 3)
figure
3)
B
G
I N
I R
2 W
S
A S
C L
3)
Tip
Sleeve
Tip
Sleeve
Unbalanced Stereo Input
Tip
Ring
Sleeve
Sleeve (s)
Tip
Ring
Sleeve
Balanced Dual Mono Input
Unbalanced Dual Mono Input
70V
8
4
OUTPUT MODE
B
).
Tip
Tip
Do not tin
the wires!
(HPF OFF)
70V
100V
100V
(HPF OFF)
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