Ashly TRA-4150 manual Input Ground Switch, Multi-Channel Operation, 50Hz Low Cut Switch

Operating Manual - Powerflex Multi-Channel Power Amplifier

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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.

4 5		Stereo	5 6		4 5		Stereo	5 6			5 6	Stereo	5 6
	6	Mono				6	Mono			4		Mono
3	7	3		7	3	7	3		7	3	7	3	7
Ch. 2	8	2		8	Ch. 2	8	2		8	Ch. 2	8	2	8
1-2 1	9	1		9	3-4 1	9	1		9	5-6 1	9	1	9
0 Ch1	10	0 Ch2 10			0 Ch3	10	0 Ch4 10			0 Ch5 10		0 Ch6 10
Norm (1-2 Mono)		Dual			Norm (3-4 Mono)		Dual			Norm (5-6 Mono)		Dual
LoCut		Bridge			LoCut		Bridge			LoCut		Bridge

50Hz

PUSH

PUSH

50Hz

PUSH

PUSH

50Hz

PUSH

PUSH

Ch1 (Mono)

Ch2

Ch3 (Mono)

Ch4

Ch5(Mono)

Ch6

3

Input

-

+

Ground +

-

-

+

Ground +

-

-

+

Ground +

-

2

1

Ground

Float

Ch 1 In

Ch 2 In

Ch 3 In

Ch 4 In

Ch 5 In

Ch 6 In

Chassis

(+) (-)

(Mono)

(Mono)

(Mono)

	115V or 230V
	50-60Hz
AC	1400W
	115V

Replace Only With

Same Type Fuse.

Refer To Owner's Manual

For Proper Fuse Rating.

7.2Input 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.

7.3Multi-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).

7.450Hz 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.

7.5Input 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.

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.

7.6Stereo/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.

7.7Dual 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.

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