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Operating Manual - Powerflex Multi-Channel Power Amplifier

P o w e r f l e x

6250 shown -

P o w e r f l e x

4400 only has

inputs 1-4.

7.2

Input Ground Switch

This switch separates internal circuit ground from

the chassis ground on all inputs. Ground connections from

an incoming signal are always connected to internal cir-

cuit ground, but float from the chassis ground as long as

the switch is out. Unless there are special circumstances

which require the circuit ground and chassis ground to be

connected, it is best to leave this switch out.

7.3

Multi-Channel Operation

The Powerflex 6250 is essentially three stereo

amplifiers in one chassis, for a total of up to six separate

channels. Similarly, the Powerflex 4400 is essentially two

stereo amplifiers in one chassis, for a total of up to four

separate channels. Thus, the following references to Ste-

reo, Mono, or Bridged operation is with regard to each

pair of channels in the amplifier. For example, Channel 1

and Channel 2 together can provide stereo, mono, or

bridged operation, completely independent of Channels 3-

4 or Channels 5-6 settings (6250 only).

7.4

50Hz Low Cut Switch

Each pair of channels has a 50Hz second order

(12 dB per octave) low-cut filter option which is applied

to both channels within the pair. When the switch is

pressed, the audio signal is -3dB at 50Hz, -15dB at 25 Hz,

-27dB at 12.5Hz, etc.

7.5

Input Level Controls

Input Level Controls attenuate input signal from

0dB down to - . For best performance, Ashly recommends

that the level controls be operated at full level (0 dB at-

tenuation).

In STEREO mode, each level control corresponds

directly to the input signal on its respective channel.

PUSH

115V

PUSH

In MONO Mode, the input signal connected to

channels 1, 3, or 5 are used to drive channels 2, 4, or 6

respectively, and the level controls for channels 1, 3, and

5 likewise control channels 2, 4, and 6. When switched to

Mono mode, channels 2, 4, or 6 level controls become in-

active.

In BRIDGED mode, the level controls function

the same as in mono mode.

7.6

Stereo/Mono Switch

Powerflex amplifiers are comprised of two (4400)

or three (6250) stereo amplifiers, each operating indepen-

dently of the others, with Stereo/Mono switching avail-

able for each channel pair. If this switch is set to Stereo

mode, the channel pair operates as two discrete amplifi-

ers, each with its own input connection and level control.

Switching to Mono mode allows one input (chan-

nel 1, 3, or 5) to drive both channels of a stereo channel

pair. Pressing the Mono switch disables the channel pair's

other input connection, as well as its level control. The

first channel's input and level control now determines the

signal to both channels.

7.7

Dual Channel/Bridge Mode Switch

Bridging a power amplifier is the process whereby

two channels are supplied the same signal, with the sec-

ond channel's phase inverted 180°. The speaker is then

connected across the (+) output connections of each chan-

nel, resulting in twice the power to the speaker that either

channel could deliver by itself. Since in Bridge Mode both

connections have voltage present, never connect or touch

either speaker wire to ground. In the Powerflex 6250, use

Bridge mode for 70V applications as well.