Ashly PowerFlex 470 Operating Manual - Page 7

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Also for Ashly PowerFlex 470: Specifications (2 pages)

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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

Input

Unbalanced

Input