MiniDSP UMIK-1 Microphone - Page 51 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #501 of 887 Old 04-12-13, 08:57 PM
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Re: MiniDSP UMIK-1 Microphone

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rmalak wrote: View Post
Well it's already on the way to be calibrated so no luck there. I will bring it up with him.

I think that is a good idea

It could be just the sensitivity that will be effected.
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post #502 of 887 Old 04-12-13, 10:52 PM
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Re: MiniDSP UMIK-1 Microphone

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rmalak wrote: View Post
Well it's already on the way to be calibrated so no luck there. I will bring it up with him.
I'm relatively sure your mic is from the third batch with the revised board, what they are calling Rev C. I just looked up your UMIK serial #0634 and its on the main calibration file download page and goes down to 10Hz... those of us with a second batch UMIK have our files stop at 20Hz, we have to go to another special download page to get our 10Hz file... so I'm pretty sure yours is a Rev C and if that's the case then you've got nothing to worry about as yours will not need the board replacement.

Please show us the two calibration files (miniDSP and the CSL) when you get your mic back from CSL... I'm very curious to see what the two files look like, especially below 20Hz. I may end up having to do the same, we'll see.
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post #503 of 887 Old 04-13-13, 10:25 AM
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Re: MiniDSP UMIK-1 Microphone

rmalak... I got to looking carefully at your calibration files this morning and noticed two things... first, your values look entirely believable (unlike mine and others I've seen with serial numbers in my range like 200-500) and second, your sensitivity factor is 10 dB greater than mine (yours is -8 dB whereas mine is -18 dB). So now I'm thinking they got the third batch correct as the DevTeam alluded to for the first time yesterday.

The fact is I wasn't even aware there was a third batch manufactured, let alone that they had already been shipping, until it was mentioned yesterday over there. So out of curiosity I decided to located at what serial number this calibration file (both sensitivity factor change and having normal 990Hz-10Hz values) change happened. It is at serial #540, it and all subsequent UMIKs I believe now are correctly calibrated and it probably had something to do with the board revision that the DevTeam alluded to yesterday. That was a hundred serial numbers ago!!! which now begs the questions of "How long ago had they known there was a problem and had a fix for it?" and "Why didn't they tell us second batch UMIK owners about it?"... this now explains the looooong silence from them on the UMIK help forum that lasted for over a month. Oh, they were working on a fix all right, but it was for the NEXT batch of UMIKs that they quietly began to ship out... seems now after finally selling a bunch of the third batch UMIKs, we owners of second batch UMIKs finally are being told now that they are soon going to have a revised board manufactured that will replace what we currently have in our mics. This makes me wonder if that was really the plan all along or if this was only a response to the pressure applied by the continued badgering and nagging from the small number of us second batch owners who knew something wasn't right and didn't let up posting about it on the UMIK help forum and over here? If no one had said anything would they even have a plan now to manufacture a revised board for us? And how does this reflect upon any first batch UMIKs? who knows since those owners haven't complained or even noticed what's been transpiring with this second batch of UMIKs. Tends to make one think the DevTeam's lack of communication and failing to supply any progress updates was intentional all along... one has to now wonder if they were just hoping the complaints from the second batch UMIK owners would just go away and then so too would the cost needed to deal with fixing the issues?

Now the question becomes can these second batch UMIKs be re-calibrated from across the ocean(s)? and if so, then why hasn't it already been done? The third batch appear to have quite reasonable calibration files, so why wasn't the same script used to quickly regenerate those 10Hz files for the second batch at the time the third batch files were being uploaded? Or perhaps this was done and the current bogus looking 10Hz calibration files are the result from this?!! Which then raises the question of exactly how are these new revised boards different... the 1kHz spikes and overtones, high noise floor, we know these issues are addressed but is there something else changed that affects the freq calibration data as well? or is it that something after the "calibration" of the second batch was changed in the calibration methodology or in the test rig on the factory floor? Something has to explain why we second batch UMIK owners haven't gotten a realistic calibration file yet when they already exist for third batch owners... I'm starting to get a little hot under the collar now. They apparently knew all this when they made the conscious decision to remove the below 20Hz data and then change the frequency specs for the second batch of UMIKs... so it was all a smoke screen to hide a botched manufacturing run that they knew about at the time yet made the decision to still ship them out to customers anyway.

Last edited by monomer; 04-13-13 at 02:30 PM.
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post #504 of 887 Old 04-13-13, 06:31 PM
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Re: MiniDSP UMIK-1 Microphone

My serial# is 7000220 and the sens factor is -24.158. Does this mean that I'm one of the unlucky ones? I just became aware that there was an issue, having the UMIK1 for over a month before I just downloaded the calibration files and just started to read this forum. Now what? I'm not that hip to all the technical issues. I really don't want to get involved in the tall weeds, I just want to have basic functionality without having to become an expert.
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post #505 of 887 Old 04-13-13, 07:05 PM
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Re: MiniDSP UMIK-1 Microphone

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rajacat wrote: View Post
My serial# is 7000220 and the sens factor is -24.158. Does this mean that I'm one of the unlucky ones? I just became aware that there was an issue, having the UMIK1 for over a month before I just downloaded the calibration files and just started to read this forum. Now what? I'm not that hip to all the technical issues. I really don't want to get involved in the tall weeds, I just want to have basic functionality without having to become an expert.
Yes, you have a second batch UMIK. If you don't care about below 20Hz response then I think you should be fine using it with the current file for most stuff, however I'd suggest you might be happier if you reduced your sensitivity factor down to at least -18 and all those numbers after the decimal point is way overkill considering the factor is a bogus value anyway.
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post #506 of 887 Old 04-13-13, 07:30 PM
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Re: MiniDSP UMIK-1 Microphone

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monomer wrote: View Post
I'm relatively sure your mic is from the third batch with the revised board, what they are calling Rev C. I just looked up your UMIK serial #0634 and its on the main calibration file download page and goes down to 10Hz... those of us with a second batch UMIK have our files stop at 20Hz, we have to go to another special download page to get our 10Hz file... so I'm pretty sure yours is a Rev C and if that's the case then you've got nothing to worry about as yours will not need the board replacement.

Please show us the two calibration files (miniDSP and the CSL) when you get your mic back from CSL... I'm very curious to see what the two files look like, especially below 20Hz. I may end up having to do the same, we'll see.
Will do monomer. That's good to hear.

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post #507 of 887 Old 04-13-13, 07:47 PM
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Re: MiniDSP UMIK-1 Microphone

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Also a reworked board is being prepared for owners of the second batch UMIKs that will be a solder-in replacement for those of us with DIY skills and they will probably offer to do it for those who are non-DIYers.
A note of wariness on my part when I read this. It could be quite easy, true, and I hope for all concerned that it will be. I have been inside a tube-construction mic before, and consider myself fairly good at the electronic and mechanical side of projects like that, and I could never get it back together satisfactorily. It would be good to see step-by-step photos and tool requirements before commiting to do that job oneself. It would be a shame to have a few "now it doesn't work AT ALL" cases come out of this.
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post #508 of 887 Old 04-13-13, 09:26 PM
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Re: MiniDSP UMIK-1 Microphone

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A note of wariness on my part when I read this. It could be quite easy, true, and I hope for all concerned that it will be. I have been inside a tube-construction mic before, and consider myself fairly good at the electronic and mechanical side of projects like that, and I could never get it back together satisfactorily. It would be good to see step-by-step photos and tool requirements before commiting to do that job oneself. It would be a shame to have a few "now it doesn't work AT ALL" cases come out of this.
From reading on the MiniDSP forums it sounds like they are planing to either have a new board available or a return and exchange deal for those affected by a faulty board.

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post #509 of 887 Old 04-13-13, 10:53 PM
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Re: MiniDSP UMIK-1 Microphone

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rajacat wrote: View Post
My serial# is 7000220 and the sens factor is -24.158. Does this mean that I'm one of the unlucky ones? I just became aware that there was an issue, having the UMIK1 for over a month before I just downloaded the calibration files and just started to read this forum. Now what? I'm not that hip to all the technical issues. I really don't want to get involved in the tall weeds, I just want to have basic functionality without having to become an expert.

My opinion is that you have paid for a calibrated microphone (accurate) so you should get that.
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post #510 of 887 Old 04-13-13, 11:03 PM
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Re: MiniDSP UMIK-1 Microphone

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rmalak wrote: View Post
From reading on the MiniDSP forums it sounds like they are planing to either have a new board available or a return and exchange deal for those affected by a faulty board.

Matter of interest would the exchange be totally no charge including freight?

Understanding both sides, economics and customer service this should of happened awhile ago.
For ongoing business it's still is a concern that most people are totally unaware of this problem (# of mics vs complaints).
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