Level controls for Channel A, B, AC Inlet

4.Level controls for CHANNEL A, B

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

5.Protection LED

This red LED indicator lights up when the thermal-protection system is working ,no signal is output during this protection period, and this means any overheating occurs inside the unit (the critical temperature is 80 ), you must take actions to avoid this overheating ,e.g. :speed up the air circulation, decrease the signal level ...

If the problem is corrected, the protection systems deactivate automatically ,this LED eliminates ,and normal amplifier operation is resumed .

3.2. The Rear Panel

	CH-B		INPUT
	CH-B		CONNECTION
			CONNECTION
		(+)		SRT
	LINE	2	1	T(+)
	LINE		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 LIMIT

CH-A

BRIDGED INPUT

	WARNING
B R E A K E R	TO REDUCE THE RISK OF FIRE
B R E A K E R	OR ELECTRIC SHOCK, DO NOT
	EXPOSE THIS APPARATUS TO
	RAIN OR MOISTURE.
	SEE INSTRUCTION BEFORE
	USING!

BRIDGED

MONO

C H A N N E L AC H A N N E L B

MODEL

SERIAL

6.Breaker

This breaker is used to protect the unit in replacement of fuse. Press it to reset .

7.AC Inlet

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.Output Connectors

The Output Connectors include the Speak-on jacks and Binding post terminals, you can use the specific Output connectors according to the actual application circumstance.

Be careful to connect the Output Connectors so as not to occur any problem.

Caution :Turn off the unit before connecting the Output Connectors so as to avoid any electric shock!

9.Balanced Input Connectors

The Input Connectors include the balanced XLR servo connectors and 1/4"TRS phone jack .For the extension to another amplifier, connect these jacks to another amplifier input jacks.

10. Clip Limit Switch

While on, the clip limit function specific to this machine keeps fixed output when the output exceeds the Maximum of the machine to protect its circuits. While off, there is no such limit

11.Mode Selector

The MACRO 830/1400/2400 Professional Stereo Amplifier presents three operating modes:

-Stereo Mode

In this mode ,Channel A and Channel B operate independently (as a conventional stereo amplifier).

The Channel A input signal will be output from the Channel A output connectors, and the Channel B input signal will be output from the Channel B output connectors.

-Parallel Mono Mode

In this mode, the Channel A input signal will be output from the output connectors of both Channels ,detail wiring diagram you can refer to Chapter5.

-Bridged Mode

In this mode, the Channel A input signal will be output from the Bridge output connectors, detail wiring diagram you can refer to Chapter5.

12.LF 30Hz Filter

Some large subsonic frequencies are present in the input signal and these can damage the consequent

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Nilfisk-ALTO MACRO 2400 Level controls for Channel A, B, Protection LED, AC Inlet, Mode Selector

Models: MACRO 1400 MACRO 830 MACRO 2400