J. W. Davis & Company DA-120M User Manual - page 3
The third dip switch (designated “J”) activates the microphone
XLR input. Do not use the phoenix-type microphone input at the
same time as this will degrade the signal.
The front panel has nine controls: Six front panel volume controls (to individually control dip switchable
microphone or auxiliary inputs located on the back panel), a bass and a treble control, plus a master
volume control. In addition, the power switch and LED signal overload indicators are located on the front
panel for easy access.
T
he first dip switch shown in Figure 1 (designated “AUX”) activates the auxiliary input. This aux input
consists of two RCA jacks (marked “AUX” with an input number and “unbalanced”) that electronically
combine stereo or two-channel audio for a mono signal. To input
a single mono signal, either RCA jack may be used.
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3030 Canton Street • P.O. Box 710219 • Dallas, Texas 75371-0219
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3
The back panel contains the six microphone/auxiliary input modules matching the six front panel
volume controls. All are similar to Figure 1 except for input module 5 which has two additional RCA jack
inputs for CD or DVD .
The fourth dip switch (designated “Phantom”) activates the phantom power needed for condenser
microphones. If the phantom power is left on, it will not harm the dynamic microphones but should be
turned off for safety measures when not in use.
The second dip switch (designated “T”) activates the phoenix-
type microphone input. Do not use the XLR connector at the
same time, as this will degrade the signal.
III - DESCRIPTION
The JWD Master Series of monaural amplifiers provide the combination of interface, signal control
and extended mixer capacity required by professional audio system integration. In addition to traditional
commercial sound applications such as paging and background music, the Master Series extends the
scope of capabilities to include integration with telephone communications, audio-visual, security, sound
masking and digital devices that previously have been available only in more complex modular amplifiers.
All features are inclusive without requiring additional accessories or modifications.
Three additional dedicated inputs with volume controls are located on the back panel. (The Master Vol-
ume Control or the Bass and Treble Controls do not affect the following three inputs.)
(1) Telephone Page input that accepts the signal directly from the page port out on the
telephone system.
(2) Music-On-Hold (built in) one-watt amplifier that provides music and information to
the telephone hold system. The same infromation may be routed to the main amplifier for
distribution to the entire sound system via input 5.
(3) System OverRide (“SOR”) input default setting is for sound masking. This input is not
affected by the tone controls or any other function of the amplifier. The sound masking may
be equalized before using the other amplifier functions. However, the input also may be
changed by a jumper on the circuit board to become a priority input for the system.
Figure 1