Crown Audio by Harman

Search:     Advanced search
Glossary



What is the wiring for old PZMs (PZM-30GP, PZM-31S, PZM-6S)?

I have a PZM-6S that had a three-pin XLR on it (looks like it was cut off). Is it possible to get the pin assignments? 
Chris Basham 
Infinity Broadcasting, Fresno 

Reply: The PZM-6S is an old model that has been discontinued. Pin 1 is ground , pin 2 is audio (high impedance unbalanced ) and –18V, and pin 3 is +18V. Those pins get their power from a Crown PX-T, PA-18 or PX-18 interface (also discontinued). 

The PX-T was a Crown device that adapted phantom power to older PZMs like the PZM-30GP, PZM-31S and PZM-6S microphones. The XLR outputs of those mics were unbalanced, high-Z, and were powered by a bipolar DC voltage . You connected each mic to a PXT using regular 2-conductor shielded mic cable. At the output of the PXT, the signal was low-Z balanced. You plugged it into a phantom power supply. The PXT converted phantom power to a bipolar DC voltage that powered each mic. 

A PX-18 was the same but worked off two internal 9V batteries and had a 1:1 internal transformer to balance the signal. A PA-18 was the same but worked off two internal 9V batteries and had an active circuit to balance the signal.
 

The old-style PZMs can be powered by unipolar power as well as bipolar, but unipolar powering reduces their maximum SPL from 148 dB to 120 dB.

Newer Crown mics, like the PZM-30D and PZM-6D, have the balancing electronics built into the mic cantilever or its connector. You simply plug the mic directly into a mic input with phantom power. The output of those mics is low-Z balanced.

The figure below shows how to power an old-style PZM from a 9V battery. If this doesn't work, reverse the connections to the mic's XLR pins 2 and 3.

 

Others in this Category
document Do PZMs need boundaries to reject sound?
document Can I order your PZM 30D/6D with 1/4" connectors?
document Have you a schematic for a PX-T phantom power adapter for an older PZM microphone?
document How do I mount a PZM to a panel? Is a PZM waterproof?
document How do I wire a PZM-10LL to my mixer mic input?
document Which PZM should I choose for drums?
document I want to use a PZM-11 or PZM-11LL with a VCR. What do I need to make the mic work?
document How far can a PZM-11LL mic be from the area I want to record voices from?
document Should I use PZM-11 or PZM-11LL for voice recognition?
document Where to place a PZM-11LL to prevent picking up duct noise?
document Would wireless PZM-30D and PZM-185 mics work to record a conference?
document How can I mike a piano with a PZM without using tape?
document Where can I get information on discontinued PZM microphones?
document How far can I mike a conference with the PZM-10?
document Do you have a wall-mount PZM for voice recognition?
document Where should I place PZM-11LL mics for voice recognition?
document How do I connect a PZM-185 or Sound Grabber II to my camcorder?
document Will PZM-185 mics work for audience miking?
document PZM-11LL signal level too low?
document PZM-185 output level vs. Sound Grabber output level
document Choosing the right PZM for recording music
document PZM-185 output level vs. Sound Grabber II output level
document What are the advantages of boundary (surface-mounted) mics like PZM and PCC mics?
document PZM history
document Picking up birds at a nature center
document PZM mounting and waterproofing
document Can the PZM-11LLWR be changed from its line-level output to a mic-level output?
document Miking flute recitals with flat floor mics
document How to mike students and eliminate background noise?
document Sound Grabber II or PZM-185?
document Clandestine listening room