Crown Audio by Harman

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Glossary



Powering a CM-30 mic that has no XLR connector

So here's the story: I have recently acquired a box of about 30 CM-30s and I would like you use them to record with. I am well aware that I need a phantom power box, however my mics have 6pin connectors on them. And I want to wire some new connectors to it. I want to know whether I should use an XLR or a 1/4" TRS connector. I don't want to fry anything, and also a wiring diagram of a CM-30 would be wonderful. I have searched for one and have come up empty handed.

Reply: Adding an XLR or TRS connector to a CM-30 mic would not enable it to be phantom powered, since the mic runs off DC bias, not phantom power . They are two different things. But you can power the mics as described below.

First, cut off the 6-pin connectors. You might want to cut each CM-30 cable fairly short because it carries a medium-impedance unbalanced signal. The circuit below powers the mic off a battery, and converts the mic to low-impedance balanced. Plug the Radio Shack adapter/transformer into an XLR mic input with phantom power turned off.

A phantom power module for the Crown CM-30 mic is the same as the one that comes with the Crown CM-31 microphone . Sorry, the module is not available separately.

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