Manual

– 11 – AtlasSound.com
Specifications are subject to change without notice.
Owner’s Manual
AA50PHD
50W Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Running a Self-Diagnostic Test using the PHD Feature
Step 1 - Install the AAPHD Mixer amplifier, connect the input signals. Turn all levels to minimum. Do not attach the speaker system to
the amp at this point.
Step 2 - Install the 70V distributed speaker system per the design, double check speaker tap settings. The total power for all the
speakers should NOT exceed the maximum power rating of the amplifier installed.
Step 3 - Connect the speaker system to the amplifier. Pay special attention when connecting the speaker leads to the proper terminals
on the amplifier. Note: All speaker power taps must be on a 70V setting.
Step 4 - Turn the amplifier On.
Important: Input levels are to be turn down or off. The Master Level is to be around 12 o’clock position or close to half way up.
Note: If the Master Level is OFF or down the PHD test will not work.
Step 5 - Before starting the system Diagnostic test. Make sure no people are present or near the speakers during the diagnostic test
without taking proper precautions. A 1 watt test tone will be present at each speaker. The audible SPL level will be based on the power
tap setting at each speaker and sensitivity specification of the speaker. The audible SPL level may be alarming to some people. Wear
proper hearing protection before starting the test.
Step 6 - Activate the PHD circuit by inserting a small, pointed tool through the hole on the front panel labeled PHD. Press and hold
the momentary switch for 5 seconds, then release. A test tone will be audible through the speaker system. If the Limit LED does not
illuminate Yellow, the system is properly set up and no errors in the system were found. Continue the installation.
Note: During the initial start of the diagnostic test, the Limit indicator may flash Yellow for a few seconds until an accurate
diagnostic reading has been completed, continue to hold the PHD switch in for 5 seconds to assure the test is complete. After
5 seconds and the Limit indicator is illuminating Yellow steadily, stop and read the section “How to Trouble Shoot Your Speaker
System If the Limit LED is Illuminating.