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Gear / Technical Help => Cables => Topic started by: Twenty8 on September 18, 2022, 11:58:18 AM
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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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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 (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.