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 • [email protected] • www.jwd.com
The Mark of the Professional...
The
D-500A
is a 2-channel high fidelity commercial mono audio amplifier capable of delivering 500
watts of
continuous
RMS power into a direct coupled 8-ohm voice coil load or into a constant voltage
25V or 70.7V line. Only 3 racks in height, the
D-500A
uses a toroidal power transformer to reduce
weight, height, and noise. The
D-500A
, designed for commercial sound or “all-in-one” telephone paging
applications, offers a balanced 600-ohm/Tel-Page input that is capable of muting the two high Imped-
ance inputs that are strapped in parallel (Thereby offering a convenient auxiliary input bridge to addi-
tional amplifiers). The 600-ohm/Tel-Page level is controlled via an independent tamper-resistant control.
-2-
CAUTION: In the event the transformer’s
thermal breaker does nto reset, have the
trouble investigated by an authorized service
technician or return unit to the factory.
WARNING: TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK,
DO NOT
EXPOSE
THIS UNIT TO RAIN OR MOISTURE
CAUTION: These deviced are not intended for
use in hazardous locations as defined by the
National Electrical Vode (NEC) and by the
National Fire Protection Association (NFPA).
WARNINGS
Features
Rack mount standard 3 RU
•
Automatic voice activated Hi-Z muting
Multiple protections including relay, short
circuit and A/C circuit breaker
Rugged power supply designed for
continuous use
Convection cooled—reliable “no maintenance”
design
•
•
•
•
WARNING: THIS AMPLIFIER MUST BE
GROUNDED.
DO NOT
REMOVE GROUND PIN
FROM AC PLUG OR USE A DEVICE TO CHANGE
FROM A 3-PIN AC PLUG.
• Fully isolated output transformer for 25 and
70.7 volt line operation
• Auxiliary RCA type Inputs for receiving source
signal and bridging source signal out
•
Independent input gain control for 600 ohm
telephone paging
• 500 watts continuous RMS power
• 4
Ω
, 8
Ω
, 25V or 70.7V outputs
Inputs
Distortion at Rated Output
Power Output
Audio Output
Frequency Response
Power Source
Hum/Noise
Dimensions
Auxiliary
, 2 RCA Connectors in Parallel for Input and Bridging. High Impdeance
Unbalanced, 0.50V, 10k Ohm.
Telephone Page
, Screw Terminal, 50mV, 600 Ohm Balanced, with VOX Mute.
Line Level
, 600 Ohm Balanced Input, 0.50V
500 Watts RMS Rated at 4, or 8 Ohm Direct, 25V, or 70.7V
4, or 8 Ohm, 25V, or 70.7V
</= 0.3% THD
±3dB 20 to 20kHz (Direct Output); ±2dB 50Hz-15kHz on 25V, or 70.7V output
90dB Below Rated Output
120VAC 60Hz
5.25" (H) x 19" (W) x 13.5" (D)
SPECIFICATIONS
Weight
Finish
43 lbs.
Flat Black
Содержание D-500A
Страница 8: ...SCHEMATIC FOR D 500A AMPLIFIER...
