MiniDSP UMIK-1 Microphone - Page 24 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #231 of 887 Old 02-12-13, 09:34 PM
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Re: MiniDSP UMIK-1 Microphone

Ugh, why did I have to find this thread. My serial no. is 7000323 and the cal file is entirely within +/- 3dB and doesn't have that spike at 20hz or 800hz

Maybe its just a database entry error on minidsp's server?

edit: actually no there is a spike at 800hz on mine, but its tiny:

773.187 0.0050
782.812 0.0083
792.557 0.0090
802.424 -0.0025
812.413 0.3771
822.526 0.3898
832.766 0.4034

Last edited by sonic_blue; 02-12-13 at 10:33 PM.
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post #232 of 887 Old 02-12-13, 10:08 PM
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Re: MiniDSP UMIK-1 Microphone

Thanks for posting this info about the calibration files. I just found out about the UMIK-1 and was thinking of ordering one. I'll hold off now until things are cleared up a bit.
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post #233 of 887 Old 02-12-13, 10:12 PM
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Re: MiniDSP UMIK-1 Microphone

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sonic_blue wrote: View Post
At minidsp forum it's suggested that perhaps they didn't bother doing a calibration below 800hz as most are "within spec" in that range anyway:



http://i.imgur.com/RDXY1NB.png
Um... that's my measurement The point of it is that the adjustment to the cal file that I suggested above will probably be a reasonable workaround, not to speculate on what/why miniDSP did I will be trying it with ausvette's mic tomorrow (thanks Dave!).
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post #234 of 887 Old 02-12-13, 10:12 PM
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Re: MiniDSP UMIK-1 Microphone

I sent a request to cancel my order. I placed my order on Sunday, right before the posts on the calibration issue. I hope MiniDSP will cancel my order. I was wary of ordering stuff from Hong Kong, I guess I should have followed my instincts! I did read the first 10 pages of this thread first though...

No offense to Chinese companies, but I have little trust in their quality control or that they are using non-counterfeit parts. The fact that they shipped mics out like this tells me they have no quality control whatsoever and are going through a separate manufacturer. Sounds like a dangerous situation to me and a bad way to run a business (if you want to sell stuff in the US).

I ordered a camera charger from China once and it was wired backwards!?! After that experience, I've avoided ordering anything from individual factories found on ebay; that is until this fiasco.

So, if my order is cancelled, is this USB mic ok to use with REW under Windows 7 64-bit?:
http://cross-spectrum.com/measuremen...ated_umm6.html
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post #235 of 887 Old 02-12-13, 10:15 PM
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Re: MiniDSP UMIK-1 Microphone

Response from miniDSP:

http://www.minidsp.com/forum/18-umik...&start=24#7907
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post #236 of 887 Old 02-12-13, 10:27 PM
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Re: MiniDSP UMIK-1 Microphone

Quote:
HifiZine wrote: View Post
I am satisfied with their response. So basically it is a matter of scaling of the data due to the 2 different rigs being used for those ranges to improve accuracy. However, that still doesn't explain the anomaly at 20hz.

I guess I got lucky as the "step" at 20hz and 800hz is already quite low on mine:


http://i.imgur.com/lel0wzG.jpg

Last edited by sonic_blue; 02-12-13 at 10:37 PM.
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post #237 of 887 Old 02-12-13, 11:11 PM
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Re: MiniDSP UMIK-1 Microphone

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sonic_blue wrote: View Post
I am satisfied with their response. So basically it is a matter of scaling of the data due to the 2 different rigs being used for those ranges to improve accuracy. However, that still doesn't explain the anomaly at 20hz...
Nor does it answer the question of how low does the calibration go below 20Hz, if at all. Guess we will all have to wait until next week to see what the newly revised calibration files look like. At least it doesn't appear we will have to send it back to Hong Kong for a re-calibration.
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post #238 of 887 Old 02-13-13, 02:21 AM
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Re: MiniDSP UMIK-1 Microphone

Quote:
sonic_blue wrote: View Post
I am satisfied with their response. So basically it is a matter of scaling of the data due to the 2 different rigs being used for those ranges to improve accuracy. However, that still doesn't explain the anomaly at 20hz.

I guess I got lucky as the "step" at 20hz and 800hz is already quite low on mine:


http://i.imgur.com/lel0wzG.jpg
I got the 0277 serial that was posted earlier in the thread.
The step at 20-30hz on mine is pretty awful, hopefully this is due to the cal file as well.

Posted on the minidsp forum so I hope we get a fix soon.
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post #239 of 887 Old 02-13-13, 02:47 AM
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Re: MiniDSP UMIK-1 Microphone

I plotted three graphs using three different calibration files in the rangen 20800 Hz(ignoring the first sample).
The graphs looked like random noise. I don't think scaling could fix the 20800 region.
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post #240 of 887 Old 02-13-13, 03:06 AM
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Re: MiniDSP UMIK-1 Microphone

Quote:
dezibel-3 wrote: View Post
Here is the "AverageCalFile" whitch uses the average values from my erlier post.
I could load it into REW and it seems to be ok. If you have any problems with it, let me know.
Good luck
Once again, thank you for all your work.
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