Ashly Operating Manual - SRA-120Power Amplifier, FRONT PANEL FEATURES 6.1Power Switch, MDA 3A

Operating Manual - SRA-120 Power Amplifier

SRA-120

Stereo

Power Amplifier

Level (dB)		Level (dB)	Stereo
-1	0	-1 0	Headphones
-3	-	-3	-
-6	-20	-6	-20
Protect	Sig. Clip		Sig. Clip
-10		-10

Channel 1	Channel 2
(Mono)

6.FRONT PANEL FEATURES

6.1Power Switch

When the unit is switched on there is a 2 second delay, during which time the PROTECT circuit will acti- vate. The load is disconnected during this power-up se- quence . When turning off the amplifier, the load is re- moved instantly, and the protect LED will briefly turn on as the power supply discharges.

6.2Level Controls

Front panel level controls allow precise indepen- dent input level attenuation to the power amp sections. When in mono or bridged mode, channel 1 controls both power amp channels. We recommend setting these con- trols full CW and controlling system gain at the mixer or preamp instead.

6.3Signal Present Indicators

Green signal present LED's indicate the presence (about 30dB below maximum output) of signals into the power amp circuitry.

6.4Clipping Indicators

Clipping occurs when the signal peak levels ex- tend beyond the available power supply rails, essentially “cutting off” the crest portion of the waveform. This pro- duces signal distortion and can potentially damage driv- ers, as the signal begins to look like a square wave. The red CLIP LED's illuminate at the onset of clipping, and accurately track both the output load and the AC line volt- age.

6.5Protect Indicators

Protect mode in the SRA-120 is automatically activated during extreme fault conditions, as well as dur- ing power-up and power-down. When in protect mode, as indicated by the red LED, the speaker output terminals are internally disconnected. Conditions causing the am- plifier to switch into protect mode include the following:

Turn-on delay/Instant turn off

Output short circuit

Load impedance below 2 ohms

DC at output (below 8Hz)

Ultrasonic signal (above 20KHz)

Amplifier overheating

Each channel automatically resets itself within one second of removal of the fault condition. In the event of overheating, it may take several minutes for the am- plifier to reset. If thermal shutdown occurs, check to see if the cooling fins have access to fresh air.

6.6Headphone Jack

The Stereo headphone output jack will drive any impedance stereo headphones. Channel 1 is connected to the 1/4" jack tip contact and channel 2 is connected to the ring.

SRA-120

Made In USA

TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE

COVER. NO USER SERVICEABLE PARTS INSIDE. REFER

SERVICING TO QUALIFIED SERVICE PERSONNEL. TO REDUCE

THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE FUSE.

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT

EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.

AVIS: RISQUE DE CHOC ELECTRIQUE -

NE PAS OUVRIR.

MDA 3A Ch.2 Outp

120VAC 50-60Hz 350W

6