J. W. Davis & Company D-250AL User Manual - page 2
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
The Mark of the Professional...
The D-250AL is a 2-channel input high fidelity commercial mono audio amplifier that will deliver 250
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 2 racks in height, the D-250AL uses a toroidal power transformer to reduce
weight, height, and noise. The D-250AL, 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
Impedance inputs that are strapped in parallel (thereby offering a convenient auxiliary input bridge to
additional 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 not 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 devices are not intended for use
in hazardous locations as defined by the National
Electrical Code (NEC) and by the National Fire
Protection Association (NFPA).
WARNINGS
Features
Rack mount standard 2 RU
•
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.
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
250 Watts RMS Rated at 8 Ohm Direct, 25V, and 70.7V
4-8 Ohm, 25V, or 70.7V
= 0.3% THD
±1dB 20 to 20kHz (Direct Output); ±1dB 50Hz-15kHz on 25V, or 70.7V output
90dB Below Rated Output
120VAC 60Hz
3.5" (H) x 19" (W) x 12" (D)
SPECIFICATIONS
Weight
Finish
26 lbs.(11.8 kg)
Flat Black
• 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
• 250 watts continuous RMS power
• 8
Ω, 25V or 70.7V outputs
•
Automatic voice activated Hi-Z muting
Low-cut filter for horn protection
•
Convection cooled, reliable “no maintenance”
design
•
Multiple protections including relay, short
circuit and A/C circuit breaker
•
•
UL Approved