Ashly manual Operating Manual - SRA-120Power Amplifier, REAR PANEL FEATURES 7.1Inputs

Operating Manual - SRA-120 Power Amplifier

SRA-120

Power

Channel 2

Protect

7.REAR PANEL FEATURES

7.1Inputs

The input of the SRA-120 amplifier is equipped with balanced 1/4" tip-ring-sleeve (TRS) phone jacks and balanced screw-terminal inputs. Each channel's connec- tors are internally wired in parallel and may be used with balanced or unbalanced connections. The nominal input impedance (balanced) is 20KΩ and the maximum input level is +22dBu.

Balanced Inputs

It is recommended that balanced input connec- tions be used whenever possible to reduce ground-loop and environment-induced hum and noise. The (+) signal is on the tip of the phone jack, the (-) signal is on the ring, and the shield is on the sleeve.

		Tip (+)
		Ring (-)
		Sleeve (Ground)
				Stereo Phone Plug
				used for balanced
Pins are	2 = (+)
numbered				XLR Male
in the	3 = (-)
connector	1 = (gnd)
insert.
	Input		Output
				Terminal Strip
	(-)	(+)	(-)	(+)
Chassis Ground			Signal Ground

Balanced Audio Connectors

Figure 7.1: Balanced Input Connections (recommended)

Unbalanced Inputs

If an unbalanced input connection is used, then the (-) connection should be connected to ground. Use of

amono (tip-sleeve) plug will automatically tie the (-) connection to ground. Never float (leave unconnected) pin 2 or pin 3 when using an unbalanced signal.

Input Ground

The CHASSIS GROUND terminal is internally connected to the chassis, the AC earth ground, and the power amplifier’s signal ground. The INPUT GROUND terminal is tied to the 1/4" jack's sleeve. It is recom- mended that the input and chassis ground terminals re- main connected with the factory-supplied jumper strap.

Tip (+)

Sleeve (Ground)

		Mono Phone Plug
		used for unbalanced
Pins are	2 = (+)
numbered		XLR Male
in the	3 = (gnd)
connector	1 = (gnd)
insert.
	Input	Output
		Terminal Strip
	(gnd) (+)	(gnd) (+)
Chassis Ground		Signal Ground

Unbalanced Audio Connectors

Figure 7.1a: Unbalanced Input Connections

tput		Ch.1 Bridged Mode: Use Red Binding
		Posts Only. Chan.2 is (+) and	Channel 2	Input is active balanced.	Channel 1 (Mono)
		Chan. 1 is (-). Do Not Connect		If unbalanced connection is used,
		Either Output to Ground.	Input	be sure to ground unused path.	Input
	(+)

Stereo	Norm	0dB	(-)	(+)	(-)	(+)
Mono	Bridged	-10dB
(-)		Input
45W/Ch.@8				Input
60W/Ch.@4	Sensitivity
				Ground

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