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AtlasSound.com
1601 JACK MCKAY BOULEVARD ENNIS, TEXAS 75119 U.S.A. • TELEPHONE: (800) 876-3333 • FAX: (800) 765-3435
©2007 ATLAS SOUND LP Printed in China ATS002604 RevA 03/07 PP
OWNER'S MANUAL
9
ATLAS SOUND PA702, 2-CHANNEL 70W POWER AMPLIFIER
INSTALLATION AND CONSIDERATIONS
Cabling:
The PA702 can be used with either balanced or unbalanced sources, and the outputs can be used with either
balanced or unbalanced loads, provided the proper cabling is used. A balanced line is defined as two-conductor
shielded cable with the two center conductors carrying the same signal but of opposite polarity when referenced to
ground. An unbalanced line is generally a single-conductor shielded cable with the center conductor carrying the
signal and the shield at ground potential.
Balanced Input - Use 2 conductor w/shield for low level signals of 20-22 gauge is best. Maintain the proper polarity,
+ to +, – to – and shield to ground. Note: The ground center pin of the Phoenix connector is common for both
channels.
Unbalanced inputs - For the RCA inputs pre-made RCA cables can be purchased from vendors to simplify
interconnection to external devices. For unbalanced signals using the Phoenix connector connect the (–) pin of the
amplifier input to the GND center pin and the (+) pin to the positive of the source.
Speaker outputs - Use 2 conductor unshielded wire of the appropriate gage. If you are unsure about this, contact
Atlas Sound Tech Support at 1-800-876-3333. Make sure you know how many speakers you need and what load
value you intend to use.
AC Sense Control Adjustment (Rear Panel)
The PA702 can be remotely turned on via the Unswitched AC Outlet. The PA702 mains power switch must be on to
activate or adjust AC sense trigger control. Prior to powering on the AC mains switch follow the instructions below.
1. Dip Switch setting to “SENSE ON” and “AC ON”.
2. Then plug a video projector or audio component into the Unswitched AC socket on the rear of the PA702.
3. By using the potentiometer adjustment labeled “AC SENSE
” rotate fully clockwise.
4. Turn on the AC Mains Power Switch of the PA702.
5. Turn on the device (video projector) that is plugged into the AC socket. If the PA702 power LED does not turn
from Red to Blue the amp is still in sleep mode. Slowly rotate the potentiometer counter clockwise until the
LED changes from Red to Blue. When Blue the amplifier will allow any audio that is at the audio inputs to be
amplified.
6. For proper triggering check the operation by turning video projector or component on and off.. When the
accessory component is turned off the AC mains power LED should turn Red immediately. If it remains Blue,
slightly rotate the adjustment clockwise until the LED turns Red. By rotating the potentiometer clockwise
(right) the trigger point becomes less sensitive to turn on, meaning it will take more AC Current draw from the
Unswitched AC outlet to turn on the amp. Note: Some components have a small change in current draw and
may be more difficult to set a proper AC trigger. In this case, “AUDIO SENSE” turn on may be an alternative
option for better standby triggering stability.