Univex AM-77 owner manual HiFi Pro

5b. ‘HiFi/Pro’ Switches for Balanced XLR inputs

‘Pro’ switch is for

the few pre-

amplifiers that have floating transformer balanced outputs

HiFi Pro

	Mode
M	L R	M M

Power	Int
Amp	Amp

Speaker

Output

+	_
	HiFi	Pro

R	Mode
M	L R	M M
Power		Int
Amp		Amp
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.

Balanced

Input

	Dual Mono Amplifier AM 77				In	Out
	Designed and Engineered in Great Britain
1	2	3	4	5		Sync
				L
						IR Link
				R
						Option
		Inputs
CAUTION	ATTENTION			No User Serviceable Components Inside.
			!	For service,contact your Authorised
RISK OF ELECTRIC SHOCK	RISQUE DE CHOC ELECTRIQUE			Dealer or Distributor.Any modifications to
DO NOT OPEN	NE PAS OUVRIR			this equipment will void all warranties.

AM-77

Power
On	Off
～ AC IN
90V	135V
190V	260V

Speaker
Output
_	+
L
SERIAL NO.

For the majority of sources, the HiFi/Pro switch (R3) is best left in the ‘HiFi’ position. However, if the source has a pro-audio style transformer balanced output, the HiFi/Pro switch needs to be set to ‘Pro’.

A transformer balanced output uses a floating secondary from an audio transformer: unlike electronic balanced outputs of any description, the signal is NOT referenced to ground (Pin 1). For such (rather rare) equipment, the ‘Pro’ switch is engaged to short-scircuit Pins 1 & 3, thus establishing the ground connection.

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