2048 Mercer Road, Lexington, Kentucky 40511-1071 USA
Phone: 859-233-4599 • Fax: 859-233-4510
Customer Toll-Free USA & Canada: 800-322-8346
www.audioauthority.com • [email protected]
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939
939
949X
942
Mono Subwoofer Demonstrations
AccessEZ Model 949X and 939
AccessEZ demonstration systems are designed for stereo presentations, but subwoofers may be
demonstrated in mono by using mono amplifiers or stereo amps with bridged outputs as shown. Connect
each sub amp output to the right channel of the 949X, and connect the right channel of the sub speaker bus
to 939 switch modules. 939 subwoofer modules are mono, so they should be connected in the standard
configuration. The diagram below accommodates four sub amps and 16 subwoofers.
SUBWOOFER LOW
LEVEL BUS FROM
9A80 CROSSOVER
12 VOLT
POWER
SUPPLY
STEREO INPUT*
DC POWER
SUBWOOFER AMPLIFIER
MONO OR STEREO**
MONO OR BRIDGED** OUTPUT
SUB BUS
(RIGHT ONLY)
SUB OUTPUT
POSITION 1
SUB AUDIO
BUS
9A80
L+ L– R+ R–
USE RIGHT
CHANNEL ONLY
POSITION 1
*
Use both Left and Right
inputs, or if only one input is
available, use the Left channel
or a Y adapter.
**
Stereo amplifiers may be
used as mono sub amps. Refer
to the amplifier’s instruction
manual to bridge the stereo
output.