Crown CM-30 Application Manual

Text of Crown CM-30 User Guide:

• 126678-1 7/00 Crown International, Inc P.O. Box 1000, Elkhart, Indiana 46515-1000 (219) 294-8200 Fax (219) 294-8329 www.crownaudio.com © 2000 Crown International, All rights reserved PZM ® , PCC ® , SASS ® and DIFFEROID ® , are registered trademarks of Crown International, Inc. Also exported as Amcron ®

• Crown CM-30, vibrations, but it does hear footsteps acoustically, like your ears. Normally this is not a problem because the audience sees and hears the actors walking across the stage. The PCC-160 picks up sound from the front, but it rejects sound from the rear. That is, it picks up the actors, but not much of the pit orchestra or P.A. speakers. Also, the PCC- 160 rejects feedback. It will feed back if the PA is too loud, like any mic, but you can turn it up louder without feedback than most other mics. To further reject the pit orchestra, place the PCC-160 in a small L-shaped corner made of thin cardboard (Figure 2). Or lay a pad of acoustic foam on the floor beh

• Crown CM-30, Stage—Hanging Mics Typically the PCC-160 can “reach” about 30 feet. But if you have trouble hearing actors farther upstage, hang one to three mics near them. The more mics, the more feedback potential there is, however. Crown makes a miniature hanging microphone called the CM-31 (Figure 4). It sounds clear and natural. The mic picks up from the front and rejects sound from the rear, which helps reject feedback. You hang it from the ceiling. The CM-31 comes in two parts - microphone and tubular electronics module, which you plug into a mic cable.

• Crown CM-30, Find the equalizer knob that reduces the feedback, and push it down until the ringing stops. Keep repeating this procedure until the sound system is loud enough. There are devices available that control feedback automatically. Such a device detects feedback and then turns down the correct frequency all by itself. Ask your local Crown dealer for details on these devices. LECTERNS Here are four ways to pick up speeches at a lectern: • Gooseneck mic • Clip-on mini mic • Surface mounted mic • Handheld mic on a boom stand Let’s look at each one: G

• Crown CM-30, On the CM-700, set the mic switch to BASS ROLLOFF. Place the mic about 8" away from the talker. Put the supplied foam windscreen on the mic to prevent breath pops. To pick up someone who is not using a lectern, place the mic on a regular mic stand (Figure 10). Suppose you have a temporary P.A. setup, such as a school principal talking to a crowd of people sitting in bleachers. Obtain two P.A. loudspeakers, each containing one or two woofers and a horn. Put the P.A. speakers on either side of the mic, behind the mic and toward the audience. The speakers can go either on the floor

• Crown CM-30, back row. If you prefer to use a mic stand instead, use a CM-700 or CM-200A cardioid mic. You could also use a PCC type microphone on a nearby surface. ATHLETIC ANNOUNCEMENTS For athletic events, you need a mic that picks up the announcer without picking up the crowd noise. That is, you need a noise cancelling mic. Crown’s noice cancelling mic is the CM-310A Differoid . It has the most gain- before-feedback and isolation of any microphone available. You can turn it up very loud without feedback. Since it cancels sounds a few inches away, the mic must b

• Crown CM-30, UNDERSTANDING SPECS We’ve covered how to choose and use Crown micro- phones in various applications. Now let’s explain the specs found in microphone data sheets. Transducer Type or Element: This spec describes how the mic converts sound into electricity. The three main types are condenser, dynamic, and ribbon. All current Crown mics are the condenser type, which generally provide the highest sound quality. Powering: Condenser mics need a power supply to operate. All Crown mics can be powered by a phantom power supply, which provides power to the mic along the mic cable. Phantom power is 12 to 48 volts DC on pins 2 and 3 with respect to pin 1 of the mic-cable connect

More Instructions:

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