J. W. Davis & Company DA-120M User Manual Download Page 15

Page: 15 / 16

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...

XII - SCHEMA

TIC FOR CHASSIS BOARD

Summary of Contents for DA-120M

Page 1: ...ries Amplifier USER S MANUAL The Mark of the Professional 090705122 Unpacking Inspection Procedures PA Speaker Layout Schematic for Input Modules 1 4 Technical Specifications Circuit Board Level Setti...

Page 2: ...ACKING AND INSPECTION PROCEDURES II FEATURES WARNING TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE WARNING TO REDUCE THE RISK OF ELECTRICAL SHOCK DO NOT RE...

Page 3: ...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 DESCRIP...

Page 4: ...for general distri bution using the switch in Figure 2 Figure 2 A wide range of background music and audio visual programming applications are supported through the CD DVD input and the six AUX inputs...

Page 5: ...edance signal from microphones mixers wireless micro phone receivers and equipment with compatible signals The input is rated at 150 1mV 6 Input 3 dip switch allows four selections auxillary AUX screw...

Page 6: ...ed at 47k 360mV 22 23 Input 6 features two RCA jacks that electronically combine stereo or two channel audio into a mono signal To input a single mono signal either RCA jack may be used The input is r...

Page 7: ...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 unbalance...

Page 8: ...r other speaker may require primary access to the system ACTIVATION OF TELEPHONE VOX MUTING The default setting of the DA 120M is shipped from the factory with the telephone VOX mute activated and wil...

Page 9: ...5dB SOR 75dB 1 Mic XLR 6 150 Ohm 1mV Mic Terminal 6 150 Ohm 1mV Aux 6 Electronically Summed 47k Ohm 100mV DVD CD Electronically Summed 47k Ohm 360mV MOH 47k Ohm 100mV SOR 47k Ohm 100mV Tel Transformer...

Page 10: ...roups of speakers to the amplifier First using low impedance i e 4 8 16 ohm outputs This is preferable where b Few horns or speakers are to be used ie typically 4 8 c Same sound levels are required at...

Page 11: ...f impedance matching uses a high impedance amplifier output which is transformed down to 8 Ohms by an impedance matching transformer at each individual speaker The big advantages of this approach as c...

Page 12: ...X POWER LOSS IN LONG LINES For long lines the power loss in watts becomes a significant factor The power supplied by the amplifier is effectively reduced by the line loss For a 0 5 dB loss in sound pr...

Page 13: ...CHNOLOGY 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 13...

Page 14: ...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 14...

Page 15: ...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 1...

Page 16: ...r fine J W Davis products such as power amplifiers pre Amplifiers mixers microphones speakers speaker systems horns lecterns baffles transformers volume controls and accessories Also be sure to check...