Atlas AA50PHD Owner's Manual - Page 10

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Rear Panel

16. Amplifier Outputs

For loudspeaker connections, connect as follows or proceed to the setup section for typical wiring schemes.

•

COM - Speaker common or negative connection

•

4Ω - Connect to direct coupled loudspeakers

•

50V - Connect to transformer coupled loudspeakers

•

100V - Connect to transformer coupled loudspeakers

17. Power Cord

Connect this grounded power cord to 220VAC circuits only. Serious damage may result otherwise.

18. Ground Terminal

Connect this terminal to electrical ground as required by local codes.

Using the PHD Mixer Amplifier Diagnostic System

The AAPHD Series features a patent pending Amplifier Self Diagnostic System. The PHD (Push Here Diagnostic) is simple to use and is

very effective running a 100V distributed system diagnostic test to assure the amplifier has the proper load applied. The proper load will

assure you a long lasting trouble free audio experience with your new AAPHD Series amplifier. Many amplifiers fail because an incorrect

load is applied to the amplifier. This is especially true when using the amplifier in a 50V or 100V distributed audio speaker system. There

are a few common failure points that can occur during system installation that are listed below.

Common Amplifier Failure Conditions, also see "How to Trouble Shoot Your Speaker System if the Fault LED is Illuminating" .

A short in the speaker wiring.

2. Improper load selection or power tap setting on 100V speaker systems. It is very common when using many speakers to

have one of the speakers tapped accidently at 8Ω. This error will definitely be very hard on a 100V amp and in most

cases cause the amp to fail within a few days. This kind of error is easy to make, time consuming to find and costly to fix.

3. Too many speakers attached or the wrong power taps are selected. If a 100 watt amp is used in a 100V system and it has

ten speakers all tapped at 10W, but three of the speakers are accidently tapped at 30W, that comes up to 160W of power

required to drive the system properly. While it may work at low levels, as soon as the system needs to be louder the

amp will be strained and could fail over time.

Most amplifier failures are caused by improper installation on the speaker side. There are two known ways to test the speaker system

after everything is installed.

A. Measure the speaker system using a true audio frequency impedance meter. These are the best way to see if your speaker

system is wired correctly for the amplifier.

B. Run the PHD Self Diagnostic test.

AtlasSound.com

AA50PHD-CE

50W Mixer Amplifier

1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.

Telephone: 800.876.3333 • Fax: 800.765.3435

Specifications are subject to change without notice.

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Owner's Manual