Owner's Manual

– 11 – AtlasSound.com
Specifications are subject to change without notice.
Owner’s Manual
AA400PHD
400W Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Rear Panel
18. Zone 2 Output Level Control
This control will vary the level at the Zone 2 output terminals. Fully counter-clockwise (0) is Off, fully clockwise (10) is the maximum
output level. The Zone 2 level control is PRE Input volume controls.
19. Remote Input Select (RIS) Port
Inputs 4, 5, & 6 can be remotely activated or selected. When any of the RIS input control port pins are shorted to ground, the signal
from that input selected will be routed to the amplifier main mix bus. The RIS control port was designed to work with the Atlas Sound
WPD-RISRL accessory item. See “Remote Input Selection and Level Control” for operation.
20. Remote Level Control Port
Remote location of a level control can be accomplished via the Remote Level control port. You can control Input 2, Inputs 4, 5, and
6, or the Master Level. Connections to a 10K pot requires three conductors and a minimum of 22 gauge wire. The return ports can
be paralleled together if one pot is to control all inputs. The AAPHD series remote level design is based on 10VDC Return VCA type
topology. Atlas Sound accessory level controls WPD-RISRL or WPD-VC10K can be used to achieve this.
The remote level control ports are PRE Input Level Controls and PRE the Master Level on the front panel. Set the system’s maximum
levels using the amplifier input level controls and then use the remote potentiometer as an attenuator from the maximum levels set.
21. Pre Out
The PRE OUT RCA port is POST the preamp mix bus but PRE the Master Level. This feature is used in two applications.
A. Effects loop - Used in conjunction with the AMP IN connector, an effects loop can be created by connecting the PRE OUT
jack to a device such as an equalizer or DSP and then back out to the AMP IN connector.
B. Second Amplifier - If the amplifier output power is not enough you can use the mixer amp as a preamp to feed a second
amplifier of choice. Note: The Master level will not be functional for the application.
22. Amp In
The AMP IN connector is useful for converting the AAPHD into a slave amp. When a line level signal is connected to this input, the
internal connection between the preamp and internal power amp is broken. Audio signals applied to this connector are POST tone
control and input level controls. The Master Level will function.
23. Amplifier Outputs
For loudspeaker connections, connect as follows or proceed to the setup section for typical wiring schemes.
• COM - Speaker common or negative connection
• 41 - Connect to direct coupled loudspeakers
• 25V - Connect to transformer coupled loudspeakers
• 70V - Connect to transformer coupled loudspeakers
24. Power Cord
Connect this grounded power cord to 120VAC circuits only. Serious damage may result otherwise.
25. Ground Terminal
Connect this terminal to electrical ground as required by local codes.