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Specifications are subject to change without notice.

Owner’s Manual AA240 Mixer Amplifier

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

Telephone: 800.876.3333 • Fax: 800.765.3435

Wiring the AA240

Speaker Outputs - Use 2 conductor unshielded wire of the appropriate gauge. 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 tap value you intend to use.

Mic/Line 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. For unbalanced signals, connect the (G) to the (–) terminal.

Unbalanced Inputs and Outputs - Pre-made RCA cables can be purchased from vendors to simplify interconnection to external devices.

Zone 2 Out - Use 2 conductor, 20–22-gauge, shielded is best. Terminate the shield at the input to the device if possible.

Load Consideration and Overload LED

The Overload LED will illuminate Yellow if the amp has sensed an improper load or the input signal is to high.

If the Overload is triggered the amp will not pass any signal for 10 seconds and will reset itself. If the amp continues to sense a

improper load or signal the amp will continue to cycle off if the load issue is resolved. It is highly recommended not continue for any

period of time without correcting the fault condition. If you continue to operate with the Overload Yellow LED on, damage may occur.

Refer to page 16 of manual for protect conditions.

In most situations when the LED is illuminated it means the speaker system load to the amp is lower than what the amp is rated for.

This usually is detected when you first are setting up the system. Below are a few load conditions to check for if the Protect light is on.

1. Connected to the wrong speaker terminal.

Always check the speaker terminal to the type of load you are using. Example: If you are installing a 70.7V system make sure the

wires are connected to the 70V and common (COM) terminals.

2. Too many speakers connected to the amp.

This is a very common mistake. If you are using a 240W amp and using the 70.7V speaker terminals, add up the number of speak-

ers and their wattage selections at the speaker. If they exceed 240W you must retap the speakers or remove the correct amount

speaker wattage until the wattage is 240W or less. Example: If you are using a 30W tap you can only connect 8 speakers to the

amp. If you are using the 7.5W tap, you can connect 32 speakers. If you have too many speakers on the amp it will load the amp

down, causing excessive current demand and will trigger the Protect circuit.

3. Wrong speaker tap selection.

It is also common in set up that in a 70.7V system one of the speakers is set to low impedance (8Ω) and not a 70.7V tap. This only

takes one speaker to load the amp down incorrectly.

4. Short in system.

This is common if the wire is run in metal conduit and the wire got nicked during the wire pull.

5. Speaker Level Controls.

If a L-PAD or stepped attenuator is wired wrong it can also load a system down.

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Atlas AA240 Bedienungshandbuch Seite 15