J. W. Davis & Company DA-120M User Manual - page 7
NEW TECHNOLOGY
OLD RELIABILITY
J.W. Davis & Company
3030 Canton Street • P.O. Box 710219 • Dallas, Texas 75371-0219
Sales 800-527-5705 • Fax 800-388-9106 • Corp 214-651-7341 • Fax 214-939-0328 • sales@jwd.com • www.jwd.com
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7
The Mark of the Professional...
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(40)
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Chassis Ground Terminal.
24VDC Power Input. The 24 VDC allows the amplifier to be used with emergency backup power supplies,
portable use or where 115VAC is not available.
Speaker Output Terminals. The available screw terminal outputs are 8
Ω, 25V or 70V. Only one output should
be used at a time.
(37) High Pass Filter Switch. When the switch is in the ON position, the output signal will roll off frequencies of
400Hz and below. Eliminating the lower frequencies will help prevent damage to the voice coil (diaphram) of
horns.
(38) Receptacle for 115V Power Cable. Built-in 5A, 250V Replaceable Fuse.
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System OverRide (“SOR”) Connector. Input for sound masking. (The input may be changed by a jumper on
the circuit board to become a priority input for the system.) The SOR input is not affected by the tone con-
trols, master volume control or any other function of the amplifier. The sound masking may be set up and
equalized before the other functions of the amplifier are used. Unbalanced 47k
Ω, 100mV.
System OverRide Volume Control. Controls the volume of System OverRide output of the amplifier.
Telephone Page Input. The transformer coupled telephone input terminals will accept a balanced (3-Wire)
or unbalanced (2-Wire) line direct from the telephone page port out (talk battery without ring). VOX muting
of inputs 1-6 during page. G=Sleeve, COM=Ring, HOT=Tip. Transformer Balanced 600
Ω.
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(26) Pre Out/Power In. The two RCA jacks offers an opening between the pre amp and the power section of
the amplifier. This allows the insertion of an equalizer or other signal conditioning equipment. Unbalanced.
(28) Booster Out, Unbalanced. 1 Volt, 600
Ω.
(27) Tape Recording Output, Unbalanced. 1 Volt
(29) Telephone Page Volume Control. Controls the page volume and is unaffected by the other controls.
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31)
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Music-On-Hold Output. Music, commercials or other information may be fed to the telephone system and
to the main amplifier if desired. 600
Ω, 1 Volt (adjustable).
Music-On-Hold Volume Control. Controls the volume of the MOH output and is unaffected by the other
controls.
Switch Music-On-Hold to Main Amp. The switch allows the same information on the MOH input to be used by
the Main Amplifier. NOTE: No other inputs on Aux 5 can be used. The controls for Input 5 on the front will
apply. The MOH output will remain controlled by the volume control located at the MOH input.
Music-On-Hold Input RCA Connector. Input for music, commercials or other information. 47k
Ω, 100mV.
, 600
Ω.