© 2002 Atlas Sound LP
Printed in U.S.A.
000202
PN 388975
SL4-1572
1601 JACK MCKAY BLVD. / ENNIS, TEXAS 75119 U.S.A.
TELEPHONE: (800) 876-3333 / FAX (800) 765-3435
AtlasSound.com
Specifications subject to change without notice
281
FOUR
IMPEDANCE-MATCHING
LOUDSPEAKER SWITCHING SYSTEMS
ASL Series
AST Series
SPEAKER POWER
HANDLING
VOLUME
WIRE
WEIGHT
MODEL CAPACITY
*CONT.
AUDIO
CONTROLS CAPACITY
LBS / KGS.
ASL-4
4 Pair
70-Watts RMS
210-Watts
4
12 to 24 ga.
9 lbs. / 4.1kgs.
ASL-6
6 Pair
70-Watts RMS
210-Watts
6
12 to 24 ga. 10.5 lbs. / 4.7kgs.
AST-4
4 Pair
40-Watts RMS
120-Watts
N/A
12 to 24 ga.
6 lbs. / 2.7kgs.
AST-6
6 Pair
40-Watts RMS
120-Watts
N/A
12 to 24 ga. 6.5 lbs. / 2.9kgs.
FEATURES
• Automatic Impedance-Matching and On/Off Push-Button Control
• Dual-Amplified Source Switching Capability
• Control of Four or Six Speaker Pairs in Multi-Room or Surround Sound Applications
• Choice of Models with Individual Loudspeaker Controls for Volume and Source Selection or
System-Wide Source Selection Only
• Compact, Low-depth Size is Perfect for Shelf or Rack Mounting
APPLICATIONS
These dual-amplified source, impedance-matching loudspeaker switching systems provide control
of up to four (ASL-4, AST-4) or six (ASL-6, AST-6) loudspeaker pairs positioned in multiple room
configurations. Units are designed to be used with one or two stereo amplifiers. This enables the
user to access different program material (system A or B) or customize a configuration.
GENERAL DESCRIPTION
The ASL and AST Series loudspeaker systems include an impedance protection circuit that
operates in pairs, allowing each set of loudspeakers to operate directly and simultaneously
from the amplifier for maximum efficiency. The left and right channels are completely isolated
for protected operation. Models are 17" W x 1
5
⁄
8
" H x 5
7
⁄
8
" D (432 x 41 x 149mm) and can be
shelf or 19" rack-mounted, with supplied brackets. All switcher models feature Euro-style
screw terminals that will facilitate 12 to 24 ga. wire, push-button on/off controls for each
connection, and attractive mar-resistant black finish. ASL Series are equipped with front-
mounted volume controls and push-button A-B selector switches for each loudspeaker pair
connection (four or six). AST Series provides for overall A-B system selection, but does not
include volume controls.
ASL Series. Models ASL-4 and ASL-6 are designed to provide switching and volume control of
up to four or six loudspeaker pairs respectively, and will accommodate any combination of
loudspeakers with 4, 8, and/or 16 ohm impedance. ASL Series features an independent on/off
switch, volume control, and A-B source selector switch for each loudspeaker pair. Volume con-
trols are equipped with heat-reducing transformers; recognized for dependable operation in a
closed environment. Attenuation is accomplished in eight steps; six steps of 3dB, one 6dB
step and an off step. (Note: attenuators are employed and pre-set to guard against system
overload so that when positioned at maximum volume; the full power of the source amplifier is
divided equally among each of the loudspeaker pairs.) Models have a power handling capacity
of 70-watts RMS* / 210-watts audio.
AST Series. Models AST-4 and AST-6 provide for switching control of up to four and six loud-
speaker pairs respectively, and will accommodate any combination of 8 and/or 16 ohm loud-
speakers. Model AST-6 also features a switch for safe connection of 4 ohm loudspeakers.
AST devices include separate on/off controls for each loudspeaker pair and one A-B source
selector switch for overall system control. Loudspeaker volume can be adjusted using individ-
ual room volume controls such as the Atlas Sound DAT-8 or SAT-8 Series (not included). AST
Series has a power handling capacity of 40-watts RMS* / 120-watts audio.
ASL SERIES
* Per channel, 8 ohm load, single room (measured @50Hz continuous)
ASL-4
( Shown With Rack-Mounting Brackets Attached )
ASL-6
( Shown With Rack-Mounting Brackets Attached )
AST-4
( Shown Without Rack-Mounting Brackets )
AST-6
( Shown Without Rack-Mounting Brackets )
AST SERIES
