Nilfisk-ALTO MAC 2.4, MAC 2.3 user manual Rear Panel

Signal LED

These signal indicators light up when the output is more than 100mV.

5. Level Control 5

These level controls are used to adjust the output signal level, you'd better adjust them properly to avoid any distortion.

3.2 Rear Panel

11

	CH-2		INPUT
			CONNECTION
	(+)		SRT
	LINE	2	1
		3	T(+)
			(GND)
2	1	(-)	R(-)
	3		S(GND)
	OFF		ON
	LF 30HZ
		FILTER
	BALANCED 1.15V/20K
	INPUT
			BRIDGED
	LINE		STEREO
2	1	PARALLEL
	3	(MONO)
	OFF		ON
	CLIP LIMT

CH-1

BRIDGED INPUT

	6	7
CH-1	CH-2	WARNING
	BREAKER	TO REDUCE THE RISK OF FIRE
		OR ELECTRIC SHOCK, DO NOT
		EXPOSE THIS APPARATUS TO
		RAIN OR MOISTURE.
		SEE INSTRUCTION BEFORE
		USING!
	BRIDGED	Apparaten skall anslutas till
	MONO	jordat uttag nar den ansluts
		till ett natverk
CHANNEL 1	CHANNEL 2

MODEL

SERIAL

A104

8 10 12 13 9

6. Breaker 6

This switch works as fuse for protecting the unit from damage. When the unit is overloaded or the temperature inside the unit is too high, this pushing-button will spring up and break the power supply. The power supply will be restored with pushing the switch down again.

7. AC Inlet 7

This connector is meant for the connection of the supplied main cord. Do not insert the power cord into this unit until voltage has been correctly set. Do not plug the power cord into the mains until the voltage has been correctly set.

8. Input Connectors 8

These connectors include the balanced XLR servo connectors and 1/4" TRS phone jacks. It is used to connect the input signal.

9. Output Connectors 9

These connectors include the speak-on jacks and binding post terminals, you can output the powered signal by the specific output connectors according to the actual application circumstance.

Caution: turn off the unit before connecting the output connectors so as to avoid any electric shock!

10. Clip Limit Switch 10

Set this switch at "ON" position, once the output level is above the maximum level, the clip limt begin, which is used to keep fixed output level for protecting apparatus. If the switch is at "OFF", this clip limt function doesn't work.

11. LF 30Hz Filter 11

Setting this switch to "ON" is equal to adding an appropriate low-pass filter in the input circuit, which is used to protect the speaker system from the damage caused by large subsonic frequencies.

12. Mode Selector 12

The MAC 2.2/2.3/2.4 stereo power amplifier presents three operating modes:

-Stereo Mode

In this mode, CHA and CHB operate independently (as a conventional stereo amplifier)

The CHA input signal will be output from the CHA output connector, and CHB input signal will be output from the CHB output connector.

-Parallel Mono Mode

In this mode, CHA input signal will be output from the output connectors of both channels, detail wiring diagram you can refer to chapter 5.

-Bridged Mode

5