Specifications:123/123068-pzm10.pdf file (10 Jan 2024)
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Crown PZM-10 Amplifier, Microphone PDF Brochure (Updated: Wednesday 10th of January 2024 03:17:07 AM)
Rating: 4.5 (rated by 53 users)
Compatible devices: STUDIO AMPLIFIER, Pulse 2X650, Com-Tech CT-400, XTi series, I, 1160MA, DCi 8, PZM-12SP.
Recommended Documentation:
©2005 by Crown Audio, Inc. 1718 W. Mishawaka Rd, Elkhart, Indiana 46517-9439 USA Tel: 574-294-8000 136367-2 2/05 Crown and PZM are registered trademarks of Crown International The Crown ® PRESSURE ZONE MICROPHONE ® (PZM ® ) THE PROBLEM Recording engineers often must place microphones near hard refl ective sur- faces. Some situations where this occurs are recording drama or opera with microphones near the stage fl oor, recording a piano with the mics near the open lid, or recording an instrument surrounded by refl ective baffl es. In these situations, sound travels from the sound source to the microphone via two paths: directly from the source to the microphone, and refl ected off the surface (Figure 1, left). Note that the refl ected sound travels a longer distance than the direct sound, so the refl ected sound is delayed relative to the direct sound. When the direct and delayed sounds combine at the microphone diaphragm, this results in phase cancellations of various frequencies. A series of peaks and dips is created in the net frequency response. This is called a comb-fi lter effect. It colors the tone quality and gives an unnatural sound. To solve this problem, we need to shorten the delay of the refl ected sound so that it arrives at the mic at the same time as the direct sound. Te c h M a d e S i m p l e Tech Made Simple Figure 2. PZM construction THE PZM SOLUTION A new kind of microphone was developed to solve the problem of phase interference from sound refl ections: the Pressure Zone Microphone or PZM. In a PZM, the diaphragm can he placed as close to the surface as desired. Then the direct and refl ected waves arrive at the microphone at the same time, in phase (Figure 1, right). This eliminates phase cancellations and results in a smooth frequency response. The diaphragm is mounted in the “pressure zone” just above the plate, a region where the direct and refl ected waves are effectively in-phase. This special microphone was designed to be used on surfaces such as fl oors, walls, tables, or even piano lids. It includes a miniature omnidirec- tional condensermic capsule, which is mounted face-down next to a sound- refl ecting plate. The microphone diaphragm is parallel with and very close to the refl ecting surface (Figure 2). Typical applications for PZMs are: • grand piano (taped to the underside of the lid) • ambience miking (on the fl oor or walls) • stereo recording of orchestras, symphonic bands and small ensembles (mounted on a panel) • drum set The PZM was invented in 1978 by audio consultant Ed Long and recording engineer Ron Wickersham. Ken Wahrenbrock marketed the fi rst PZM prototypes, and Crown started manufacturing PZMs in 1980. PZM BENEFITS • Eliminates phase cancellations, giving a clear, natural sound. • 6 dB higher sensitivity and 6 dB better signal-to-noise ratio (improved “reach”). • Unchanging tone quality as the sound source moves. • Lack of off-axis coloration. • Small size, inconspicuous. • Hemispherical polar pattern. It can be shaped by the addition of panels near the mic capsule. TO LEARN MORE Go to www.crownaudio.com and click on Microphones. Then select Document Library. Look under Microphone Application Guides to fi nd the Crown Boundary Microphone Application Guide. Figure 1. Conventional mic vs. a PZM BOUNDARY PLATE CAPSULE HOLDER MIC CAPSULE CAPSULE HOLDER MIC CAPSULE PLATE SIDE VIEW SOUND SOURCE DIRECT SOUND MIC REFLECTED SOUND SURFACE RESULTING FREQUENCY RESPONSE dB FREQUENCY BOUNDARY MIC DIRECT SOUND SOUND SOURCE REFLECTED SOUND RESULTING FREQUENCY RESPONSE dB FREQUENCY
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