Pa Speaker Wiring
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The audio detector was simply a lowgain amplifier that when connected to the speaker wires of the PA system instantly converted each speaker into a microphone. No wiring labor is involved and most of the largest cities rushed into audio detection in the early 1970s. Very few of these systems are still functioning, and millions of dollars were wasted because they were used incorrectly. In recent years the smaller towns A set of bleachers was constructed just after the Korean War from unfinished timber and a tower and speaker system topped off the ceremonial grounds. At the beginning of every annual race, however, someone had to rethread the P.A. speaker wiring because.the Rakola boys regularly used the speaker pole for .22 caliber target practice. While many of the children in town did not see the whole jalopy race because they were in other festivities of the day, most tried to be on hand at the To test without requiring a crossover, use a twoway monitor or 'winebar' PA speaker (with its own internal passive crossover). To test without risking the speaker, in case the amp is faultv, connect a 40watt car (auto) 12V light bulb in line with the speaker wiring (either side). Then if the worst happens, the bulb will glow or blow to protect the speaker. Take off the lid and look inside for signs of past repair work for instance parts that don't quite fit the board, or are noticeably different.to This would generally be the case for monitor and PA speakers the first receives the signal from the power amp, the second is linked to the first, the third to the second and so on. The positives are always connected to the tips of jack plugs and are usually marked with a + or a red dot on the speaker itself. Speakers though may be connected by 'speakon' cabling, by jack ended speaker cable or by speaker wire, the wires bound onto posts. Parallel Connection Connecting speakers in Permanent speaker wiring should be as well protected as power wiring, if for a somewhat different reason. In the case of power wiring, the protection is for the safety of the public and the prevention of fire hazard. In that of speaker.wiring, it is for the protection of the system against failure caused by "something happening" to the wiring. But it is good to employ similar protective measures: conduit, protected cable, or some simpler method. If the speaker wiring looks like power wiring, With a few simple wiring changes and the addition of some inexpensive parts, your car radio can easily double as a PA system. The conversion Essentially, the modifications consist of the addition of a control panel, and rewiring of the radio so that its audio amplifier can be used as a separate PA amplifier when desired. In this application, the amplifier input is switched to a microphone jack on the control panel, while its output is switched to a separate PA speaker..The schematic and Batteryoperated, portable, this lowpower PA system is rugged, dependable MOUNTING DETAIL Fig. 5. Schematic wiring diagram and parts list. Fig. 1. Fullscale drawing of commercial printedcircuit board on which all small parts will be Its rated power output of approximately 500 milliwatts, driving a highly efficient trumpet speaker, permits ordinary speech to be heard clearly over 500 feet away. Construction is simplified through the use of a commercially available printed circuit During the day, the P.A. system is used normally. At night, however, the P.A. amplifier is turned off and the audio detector switched on by the last person to leave the building. This action utilizes (electronically converts) all.the speakers to microphones, and allows a panel operator to “listen in” to all areas throughout the building equipped with P.A. speakers. This is possible even though the only wiring connecting the detector to the speaker cable harness is behind the P.A. rack.A Comprehensive Guide to P.A. and Music Reinforcement Systems and Technology Scott Hunter Stark. Two 80 drivers in parallel: total impedance=40 Another met hod of wiring same circuit as above: simple jumper wires between drivers. n. Four 80 drivers in parallel: total imped8nce=20 Series/Parallel circuit: with four 80 drivers, total impedance = 80 Another method of series wiring: Take (> lead of speaker A and connect to ( + ) lead of speaker B. Fig. 10.3. Common wiring The.speakers were: E. F. Patterson, District Manager, Erie, Pa. ; J. H. Gasper, Plant Chief, Pittsburgh, Pa.; J. A. Collette, Traffic Inspector, Uniontown, Pa.; M. J. Bishop, Superintendent of Right of Way, Pittsburgh, Pa. The discussion, which took Lawrence County Telephone Society At a meeting held February 23, in New Castle, A. H. Schwartz read a paper on the Substitution of Cable for Twist Wire and a description of the methods of making cable. At the meeting held March 8 the