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7.
REAR PANEL FEATURES
7.1
Input Connectors
The Powerflex 70V amplifier inputs use balanced two piece "Euro-
block" connectors for easy installation. It is recommended that balanced
signals be used whenever possible to take full advantage of the amplifier's
common mode rejection properties, and to reduce ground-loop problems.
If there is a persistent hum problem, try connecting a balanced sig-
nal to the Euroblock input with the Input Ground switch pushed out (ie. no
input ground connection), but connected to ground at the signal source.
This eliminates potential ground currents through the input cable yet pre-
serves the benefits of shielding.
If using an unbalanced (single ended) source, do not leave uncon-
nected the (+) or (-) input connection. Connect the signal to (+) and the
cable shield to both (-) and ground. If hum persists, connect the cable shield
only to the (-) input.
7.2
Input Ground Switch
This switch is used to disconnect the input cable ground
from chassis. The amplifier's internal signal ground is always referenced to
earth ground so that the amplifier output never floats. Unless there is a
ground loop induced hum problem in the audio system, it is recommended
that the Input Ground switch be left in to connect the input cable ground to
the amplifier's chassis.
7.3
Independent/Parallel Mode Switch
Each input channel can be switched to provide the input signal to the next higher-numbered channel.
This makes possible a variety of input channel routing configurations to be done internally to the amplifier. If the
Independent/Parallel switch is in the out position (independent mode), the input signal is fed only to the connected
channel. When the Independent/Parallel switch is pushed in (parallel mode), the input signal is fed to the next higher-
numbered channel before it's level control. By depressing all Independent/Parallel switches and feeding a signal into
Operating Manual - Powerflex Multi-Channel 70V Power Amplifier
* Powerflex 670 shown - Powerflex 470
only has channels 1-4.
-
+
Euroblock
Connector
System
-
+
Euroblock
Connector
System
Balanced
G
-
+
G
Input
G
-
+
G
-
+
Unbalanced
G
-
+
G
Input
G
-
+
G
-
+
7
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