Lectrosonics PA8 Operating Instructions Manual - Installation
4
INSTALLATION
Installing the PA8 properly is simple, and only requires attention to a few issues. The PA8 should be used in a
grounded metal rack. One open rack space should be provided above and below the PA8 for proper ventilation. Shown
below are the connections for both non-bridged and bridged operation.
Input
DRIVING DEVICE
PA8
GND
Output
GND
Input
Output
DRIVING DEVICE
PA8
GND
GND
In 1
Out 2
DRIVING DEVICE
PA8
Out 1
In 2
GND
GND
In 1
Out 2
DRIVING DEVICE
PA8
Out 1
In 2
GND
GND
BRIDGED OUTPUT
Two adjacent channels of a PA8 may be connected as
shown in Figure 4 to allow bridging operation. In the
bridged mode, the minimum speaker load is 8 Ohms, and
maximum power output is 20W into 8 Ohms. Note that
since the Channel Level controls of both bridged chan-
nels will be active, they should be set to the same level.
The loudspeaker is connected to the “+” output terminals
of each channel, while the “-” outputs are left uncon-
nected.
When driving the PA8 with an unbalanced source, the (-)
terminal is connected to the ground of the driving signal,
as well as the ground terminal of the PA8 input. Figure 3
shows this configuration.
Figure 5 shows bridging operation using an unbalanced
source.
Figure 2 - Balanced Input / Non-Bridged Output
Figure 3 - Unbalanced In / Non-Bridged Out
Figure 4 - Balanced In / Bridged Out
Figure 5 - Unbalanced In / Bridged Out
NON-BRIDGED OUTPUT
The standard PA8 configuration would have a balanced
output device (like the MM8 Matrix Mixer) driving each
channel of the PA8. The speaker is connected in the non-
bridged mode. Maximum output power is 10W into 4
Ohms, or 6W into 8 Ohms. Figure 2 shows this configu-
ration.