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TOPIC: UMIK-1, standard factory gain

UMIK-1, standard factory gain 5 years 2 months ago #15314

  • Maba57
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Hi, sorry for my bad Englich ...

I bought UMIK-1 SN # 700-3738 from Blueplanet Acoustic. The REW is recognized as UMIK-1 Gain: 18dB. "Sens Factor =-0.212dB" in cal file.
Is it OK?
I thought the standard factory setting is gain12 dB.
Thanks

maba
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UMIK-1, standard factory gain 5 years 2 months ago #15333

  • devteam
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Maba,

Latest versions are indeed with 18dB gain as per the general request to increase the sensitivity for Dirac software and other measurement software. It will work even better at lower levels. You can always change the gain if you want to listen @ higher dB levels by opening the ring and changing the internal DIP switch.

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UMIK-1, standard factory gain 5 years 1 week ago #16028

  • qtanker
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Hi,

Around one year ago I bought UMIK-1 with SN 7001310 .

Device name (under OS X) appears as "UMIK-1 Gain:36dB". I am quite sure Gain figure was different before, maybe 12dB or 18dB (can't really remember).
I think this change appeared after I accidentally dropped microphone.

Indoor ambient noise measures around 75dB(C), which I think is way too high.

Is it possible that due to the impact some of DIP switch settings has changed?
What should I set DIP switches to?

thanks
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UMIK-1, standard factory gain 5 years 1 week ago #16037

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@ Qtanker,

It indeed sounds like the internal DIP switch got changed here (or the drop damaged your mic).
Looking at the back of the UMIK-1, you can see a little "ring" with 2 little holes. You can use a pair of tweezer (or sometime rotate with finger on that ring is enough) and you can open the PCB very carefully. Inside there is a PCB with some DIP switch. You can change the DIP switch back to 18dB (see the back of the PCB for the table of how switch are supposed to be configured).

Please start a ticket so we can share some pics if you have further questions. minidsp.desk.com

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UMIK-1, standard factory gain 3 years 2 months ago #27127

  • bnae38
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This confuses me.

I just purchased a umik from cross spectrum, sn 701-7833. It's sense factor in the cal files is -1.921.

On windows it shows up with gain: 18db.


In rew my levels on rta and sweeps seem high (by 18db?). Shouldn't the sense factor be something closer to -18?


Thanks
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UMIK-1, standard factory gain 3 years 2 months ago #27195

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SENS FACTOR = unique setting of the calibration of the microphone for 94dB SPL reading
GAIN of 18dB = analog gain at the input of the ADC.

These 2 settings have zero relationship whatsoever I'm afraid.. :-)
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UMIK-1, standard factory gain 3 years 2 months ago #27221

  • bnae38
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Got it. In other words, spl levels should be correct..

I have about 61db avg over the course of a couple minutes on the rew rta. My wife and son are playing video games about 15ft away.


Suppose that sounds about right.


Had myself convinced it was high before.


Thanks
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