Crown Audioメーカー133472-1Aの使用説明書/サービス説明書
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1 Amplifi er Application Guide Amplifi er Application Guide © 2006 by Cro wn A udio ® Inc., 1718 W . Misha waka Rd., Elkhart, IN 46517-9439 U.S .A.
2 Amplifi er Application Guide The inf or mation fur nished in this manual does not include all of the details of design, production, or v ariations of the equipment. Nor does it cov er e very possible situation which ma y ar ise during installa- tion, operation or maintenance .
3 Amplifi er Application Guide T able of Contents Introduction .................................................................................................. 4 Chapter 1: Crown Amplifi ers In-Depth ...............................................
4 Amplifi er Application Guide Intr oduction This application guide provides useful inf or mation designed to help you best use your ne w Crown ® amplifi er . It is designed to complement your amplifi er’ s Operation Manual , which describes the specifi c features and specifi cations of your amplifi er .
Chapter 1: Crown Amplifi ers In-Depth 5 Amplifi er Application Guide In This Chapter • Rack Cooling • System Wir ing • Amplifi er Load Impedance • Multi-W ay Systems • Distributed Speak er Systems • Setting System Gain Structure T his chapter provides inf or mation to help you get optimum perf or mance from your Cro wn amplifi er .
6 Chapter 1: Crown Amplifi ers In-Depth Amplifi er Application Guide sides) is not bloc ked or cov ered by cab les. Also , if y our Crown amp has f oam fi lters , they can be cleaned with mild dish detergent and water when needed.
Chapter 1: Crown Amplifi ers In-Depth 7 Amplifi er Application Guide 1.2 System Wiring The inf or mation in this section cov ers making input and output wir ing connec- tions, as w ell as troubleshooting prob lems relating to system wir ing.
8 Chapter 1: Crown Amplifi ers In-Depth Amplifi er Application Guide Unbalanced, Grounded Sour ce , T win-Lead Shielded Cable F or use with components equipped with three-wire grounded A C line cord or other ground connection.
Chapter 1: Crown Amplifi ers In-Depth 9 Amplifi er Application Guide 1.2.2 Solving Input Prob lems Infrasonic (Subaudible) Frequencies Sometimes large infrasonic (sub- audible) frequencies are present in the input signal. These can damage loudspeakers b y ov er loading or ov erheating them.
10 Chapter 1: Crown Amplifi ers In-Depth Amplifi er Application Guide 1.3 Output Wiring 1.3.1 Output Connector Wiring 5-W ay Binding P ost If the amplifi er is set f or Stereo (Dual), connect the positive (+) and negative (–) leads of each loudspeaker to the appropri- ate Channel 1 and Channel 2 output connectors as shown in Figure 1.
Chapter 1: Crown Amplifi ers In-Depth 11 Amplifi er Application Guide Barrier Block If the amplifi er is set f or Stereo (Dual), connect the positive (+) and negativ e (–) leads of each loudspeaker to the appropriate Channel 1 and Channel 2 output connectors as shown in Figure 1.
12 Chapter 1: Crown Amplifi ers In-Depth Amplifi er Application Guide 3b . If the Mode switch is in the “Stereo” posi- tion (f or stereo con- fi guration), connect the positiv e (+) and negativ e (–) leads of each wire to the appropriate Chan- nel 1 and Channel 2 connectors as shown in Figure 1.
Chapter 1: Crown Amplifi ers In-Depth 13 Amplifi er Application Guide T o connect the Speakon plug into the mating connector on the speaker , line up the notches between the inser t and the mating connector , then inser t the plug and tur n one quar ter-tur n clockwise as shown in Figure 1.
14 Chapter 1: Crown Amplifi ers In-Depth Amplifi er Application Guide Each speaker has an impedance rating, typically 4 or 8 ohms. Connect- ing one 8-ohm speaker to an amplifi er channel presents an 8-ohm impedance to the channel.
Chapter 1: Crown Amplifi ers In-Depth 15 Amplifi er Application Guide 1.3.3 Determining Appr opriate Speaker Wire Gaug e Y ou should choose loudspeaker cab les with suffi cient gauge (thic kness) f or the length being used.
16 Chapter 1: Crown Amplifi ers In-Depth Amplifi er Application Guide T wo different types of fuses are required f or ther mal protection and v oltage protection. Slow-b low fuses are usually selected to protect loudspeakers from thermal damage because they are similar to loudspeakers in the w ay the y respond to ther mal conditions ov er time.
Chapter 1: Crown Amplifi ers In-Depth 17 Amplifi er Application Guide 4. Nev er connect the amplifi er’ s input and output grounds together . 5. Nev er tie the outputs of multiple amplifi ers together . 6. Keep loudspeak er cables well separated from input cab les.
18 Chapter 1: Crown Amplifi ers In-Depth Amplifi er Application Guide le vel to driv e the speaker , and are connected across the wires (see Figure 1.
Chapter 1: Crown Amplifi ers In-Depth 19 Amplifi er Application Guide Figure 1.27 T ypical Single-Amp, Stereo, T wo-Way Hookup Figure 1.28 T ypical T wo-Amp, Bridge-Mono, T wo-Way Hookup.
20 Chapter 1: Crown Amplifi ers In-Depth Amplifi er Application Guide Figure 1.29 T ypical Three-Amp, Bridge-Mono, Three-Way Hookup Figure 1.30 Fault Status External Circuit Design When you use an activ e crossov er to split the pow er drive to the loudspeak er components, y ou gain a wide range of advantages , including: 1.
Chapter 1: Crown Amplifi ers In-Depth 21 Amplifi er Application Guide 1.5 F ault Monitoring The F ault (RJ-11) jack, which looks like a telephone plug, is located on the back of y our amplifi er (if equipped). It gives y ou an easy wa y to remotely monitor the amplifi er’ s f ault status.
22 Chapter 1: Crown Amplifi ers In-Depth Amplifi er Application Guide 1.6.1 System Levels When setting system gain, star t at the front of the system and work your wa y toward the amplifi er . A system with the low est noise fl oor and maximum o v erall gain will ha ve most of its gain early in the signal chain.
Chapter 2: T roub leshooting 23 Amplifi er Application Guide In This Chapter • T roubleshooting Flo wchar ts T his section provides fl o wchar ts to assist you in troub leshooting problems with your amplifi er . In some situations the problem ma y not be with the amplifi er , but r ather ma y be caused by a system condition.
24 Chapter 2: T roub leshooting Amplifi er Application Guide Figure 2.2 No Power 2.1 No P ower No Powe r I s the P ow er (Enabl e) sw itch o n? I s am p plugged in to the AC sour ce? P lug am p in to the AC source . Turn the Pow er (Enabl e) sw itch on.
Chapter 2: T roub leshooting 25 Amplifi er Application Guide Figure 2.3 No Sound 2.2 No Sound No Sou n d Ar e th e le v e l contr ols turned up? A re signal ind ica to r s bli nki ng? Chec k si gnal s ource for adequate output . Turn up level control s unti l you hear out put.
26 Chapter 2: T roub leshooting Amplifi er Application Guide Figure 2.4 Bad Sound Figure 2.5 Amp Overheating Am p Ov e r he atin g Is t h e a m p operating w ithi n its r a te d im pedance? A re the fil ters (if equi pped) cl ogged? Cl ean or replace filters.
Chapter 3: Glossar y of T erms 27 English Amplifi er Application Guide In This Chapter • Glossar y of T er ms T his section provides a handy glossary of ter ms used in the discussion of profes- sional audio amplifi ers. Some ter ms are unique to Crown amplifi ers .
2 8 Chapter 3: Glossar y of T erms Amplifi er Application Guide Bus In audio terms, a Bus is a point in a circuit where many sig- nals are brought together . F or e xample: Most electronic items hav e a Ground Bus where all of a device’ s individual ground paths are tied together .
Chapter 3: Glossar y of T erms 29 English Amplifi er Application Guide manif ests itself as some type of hum, static, or b uzz. Such electromagnetic fi elds are produced by fl uorescent lights, pow.
3 0 Chapter 3: Glossar y of T erms Amplifi er Application Guide I Load/ I Limit Indicator An indicator of some Crown amplifi ers that shows current fl ow to the loudspeakers (“current load”) and the maxim um cur- rent av ailable from the amplifi er (“current limit”).
Chapter 3: Glossar y of T erms 31 English Amplifi er Application Guide the amplifi er that allows a single input to f eed two combined output channels in order to provide a single output with twice the current of an individual channel in Stereo or Dual mode.
3 2 Chapter 3: Glossar y of T erms Amplifi er Application Guide Sound Pressure Level (SPL) The acoustic volume or perceiv ed loudness of sound, measured in decibels.
Appendix: Suggested Reading 33 English Amplifi er Application Guide T his Appendix provides a a list of suggested pub lications for fur ther reading about prof essional audio .
34 Appendix: Suggested Reading Amplifi er Application Guide NORTH AMERICA SUMMAR Y OF W ARRANTY The Crown A udio Division of Crown Inter national, Inc.
Appendix: Suggested Reading 35 Amplifi er Application Guide WORLD WIDE SUMMAR Y OF W ARRANTY The Crown A udio Division of Crown Inter national, Inc., 1718 W est Mishaw aka Road, Elkhar t, Indiana 46517-4095 U .
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