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Author Topic: Three-wire question, Shure Beta 98/s  (Read 220 times)

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Offline Twenty8

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Three-wire question, Shure Beta 98/s
« on: September 18, 2022, 11:58:18 AM »
I have a set of Shure Beta 98/s.  I do not have the Shure RPM626 to power them.

So here is the spec sheet:
https://www.ouvrezvosoreilles.fr/docs-techniques/beta98_specsheet.pdf

Before I get a pair of those RPM626s I have a question for those of you who know more about this than myself:

With polarity being "positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3"
AND
these small mics needing 48v phantom, can I run a TA3 > XLR cable from the microphone to the deck?  Do I need the RPM626 if it needs 48v?

At first I thought I could run these to my AT8533x power modules with a TA3-F > TA3-F cable, but they need 48v.
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Offline Gutbucket

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Re: Three-wire question, Shure Beta 98/s
« Reply #1 on: September 19, 2022, 11:12:32 AM »
I think you'll need either a 3-wire preamp (which may be phantom powered, such as the Shure RPM626) or a 3-wire battery box to run them. Same as miniature AudioTechnica mics in their original unmodified configuration.  3-wire low voltage powering is a different scheme than Phantom..

Here is the user guide:
https://pubs.shure.com/view/guide/BETA98H/en-US.pdf?_gl=1*19zkz6n*_ga*ODkxOTYzODc2LjE2NjM1OTc5MjM.*_ga_DB3CR9SF0C*MTY2MzU5NzkyMy4xLjEuMTY2MzU5ODY3NS4yOS4wLjA.&_ga=2.115765455.831098199.1663597923-891963876.1663597923

See bottom of page 3, where there is a circuit diagram beneath the polar plots.  Particularly the middle section between RC filter and Preamp, which shows 3-wires labeled: Black (to souce)(audio) / Red (to drain)(DC bias) / Shield.  That seems to indicate wiring between the separated microphone and preamp, with the preamp using phantom power and converting it to 3-wire mic-power.

The specification sheet assumes use of the RPM626 with the mic and does not apply to just the mic itself.  However it does not make that clear. I really wish microphone manufacturers would be more clear about this kind of thing.
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