Owner's Manual

– 13 – AtlasSound.com
Specifications are subject to change without notice.
Owner’s Manual AA240 Mixer Amplifier
1601 Jack McKay Blvd. • Ennis, Texas 75119 U.S.A.
Telephone: [phone] • Fax: [phone]
Example 2 — Hotel Room Combining Using Two AA240s
This example utilizes the combining feature of the Atlas AA240 mixer amplifiers. The drawing below shows the equipment connections
for two hotel ballrooms, separated by a moveable air wall. The hotel needs to be able to have the audio system operate as one large
unit (air wall open) or two discreet systems (air wall closed). As indicated in the example, a BGM CD player is shared between the
two AA240s, via a “Y” cable, connected to input 6 of each mixer amp. The Bridge terminals of both amplifiers are connected together,
through a DPST switch that makes (combines) or breaks (separates) the Bridge connections between the amplifiers. When the switch
is closed, any audio signal into either amp will be present at both amplifier's speaker outputs. A volume control and DPST switch (see
drawing for clarity) controls the background music level and turns the music on or off in each room. For emergency evacuation pur-
poses, a signal from the hotel's fire alarm system is connected to channel 1 of both amplifiers, with the mute sensitivity adjusted as
needed. All other channels are set for mute receive and will mute when the siren tone is present on channel 1.
Dipswitch Settings
Dipswitch “A” 1–6
Dipswitch “B” 1–8
Dipswitch 1
(Set To The Required Gain)
Dipswitch 2
Mic
Dipswitch 3
Mic
Dipswitch 4
Mic
Dipswitch 5
Mic
Dipswitch 6
Mic
Dipswitch 7
Depends On
Mic Type
Dipswitch 8
Will depend if the remote volume
control will control just the BGM or
be a Master Volume Control.
Dipswitch 1
On
Dipswitch 2
On
Dipswitch 3
On
Dipswitch 4
On
Dipswitch 5
On
Dipswitch 6
On
Siren tone from building EVAC system,
Ch. 1 set for mute send.
powe r
powe r
powe r
+ + + + +
SP Out
+ + + + +
SP Out
Ballroom "A" Microphones
Ballroom "B" Microphones
From Annunciator Panel
ON
OFF
ON
OFF
ON
OFF
Room Combine
Switch
Music On/Off Room B
Remote Volume Room B
BGM Source
Tape Record Ballroom "B"
Tape Record Ballroom "A"
70.7V Speakers Ballroom "B"
70.7V Speakers Ballroom "A"
Music On/Off Room A
Remote Volume Room A
B A
B A