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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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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.
 

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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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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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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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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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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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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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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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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.
Thanks for the reply.

How do I reduce the sensitivity factor down to -18?
 

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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.
I hear ya... there are currently a couple of guys that have soldered in big old radial capacitors onto these boards and I was wondering how the they got it all back together. There is also a resistor mod that's the DevTeam has suggested and I'm told the SMDs are 0603... awhile back I replace a couple 0805 resistors on an amp board and that's my limit. As far as doing modding individual components on a board, that's a bit too small for me but to replace a whole board? how hard can that be really? I'm thinking its just soldering a couple wires right? and the physical board should be the same so it 'should' just slip back into the housing. I've never done this before but I'm imagining most anyone with a soldering iron should be capable. DevTeam mention getting some pictures and instruction posted on doing the mod. They've also hinted twice now that they will do the work for anyone who isn't a DIY kinda guy... I'm going to assume that they will pick up the tab for shipping BOTH ways, though that hasn't been mentioned. Not cheap to ship to Hong Kong, not to mention the lengthy time getting through customs... I could see it taking weeks to get a mic back unless its through Speed Post which is quite expensive. It would be better if they set up some sort of exchange system. Of course this is all just pre-mature speculation as they've yet to even get these revised boards manufactured for us and who knows how long that will be. They also promised to notify all second batch UMIK owners by email when this does happen... that will be a first (I mean the part about emailing UMIK owners informing them of anything that's been going on).
 

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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).
It would be great if they could just issue a new calibration file that you could download but since each mic is unique how would they do that?

Otherwise I'd just soon send my mic back and be sent a new one that works right.
 

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It would be great if they could just issue a new calibration file that you could download but since each mic is unique how would they do that?

Otherwise I'd just soon send my mic back and be sent a new one that works right.
The mic manufacturer has the 'raw' calibration data from the factory floor test bed... a calibration file is then generated from this using a script that uses a reference mic so theoretically they don't need to measure your mic again to correct errors in the script. Their claim is that the reference mic was improperly measured and they seem confident that they can produce a corrected file by revising the script. Supposedly these revised boards shouldn't affect the measured frequency calibration data but all this remains to be seen. At this point I don't feel confident about anything they are saying... they've disappointed me too many times already. They've shown in the past that they are not willing to share all pertinent information and will keep quiet about some things they are doing. I'm just really bothered by the fact that the third batch UMIKs have reasonable calibration files and yet the second batch UMIKs do not... I'm certain they used the same script to generate the 10Hz calibration files for both batches of UMIKs and yet they end up vastly different... there is something we are NOT being told about those revised boards and that bugs me.

This stuff just leaves me weary, why can't they make it simple?

I'd like to just send them back my UMIK and have them cross ship me a third batch UMIK so I don't have to wait forever and wonder if they sent it back to the factory to be remeasured or not... then they can rework and recalibrate that one and sell as fourth batch UMIK to some future customer.
 

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I hear ya... there are currently a couple of guys that have soldered in big old radial capacitors onto these boards and I was wondering how the they got it all back together. There is also a resistor mod that's the DevTeam has suggested and I'm told the SMDs are 0603... awhile back I replace a couple 0805 resistors on an amp board and that's my limit. As far as doing modding individual components on a board, that's a bit too small for me but to replace a whole board? how hard can that be really? I'm thinking its just soldering a couple wires right? and the physical board should be the same so it 'should' just slip back into the housing. I've never done this before but I'm imagining most anyone with a soldering iron should be capable. DevTeam mention getting some pictures and instruction posted on doing the mod. They've also hinted twice now that they will do the work for anyone who isn't a DIY kinda guy...
Here is what I am trying to visualize. The mic capsule has a pair of wires, probably twisted, going to the circuit board. That twisted pair has to be long enough to be stretched out so the circuit board can be pulled out all the way so the connection point for that pair of wires is exposed, so they can be unsoldered and resoldered to the new board. All this without removing the mic capsule which is - glued? pressed? screwed? - into place, and hopefully without accidentally breaking one of the connections at the capsule, which would be impossible to get at to repair without removing the capsule and the tiny screen over it, if it even can be done safely and without special tooling, and then re-screwing/gluing/pressing it into place (plus the screen, however it is retained). Then you have the extra wire to get pushed back into the tube - how was it originally arranged at factory assembly, folded back and forth? stretched along the circuit board? nicely coiled? is it even possible to duplicate the original arrangement/positioning of the wire without duplicating the entire assembly process? does it matter? is any kind of capacitive coupling a concern, with possible affect on high-frequency response if that extra wire positioning is done "poorly," whatever that may be? Then the extra wire is pushed back into the tube by the new circuit board as it is re-inserted. Is there anything it might catch on, causing it to be pulled out of proper position/pushed into a bad position/break a connection/get pinched and broken/get pinched and have conductor exposed to short against the outer tube/get pinched and jam the circuit board so it cannot be inserted or removed without damage? Or what if the extra wire gets balled up wrong and holds the board from sliding in all the way easily, is it OK to push a little? how hard?..... I could go on.

All this and when the DIY repairer is done, she/he expects to have a precision instrument that meets factory specs and is reliable and performs within a fraction of a dB of the curve that was measured at the factory.

Granted, my one experience opening a tubular-construction condenser mic was 99% negative, and I was a bit obsessive about getting it back together just right (which never happened, it is still in pieces), and maybe the UMIK-1 design will be easy to work with, but based on my experience and having a bit of an idea how mics like that are constructed... I would not sign up to do that work without knowing a lot of detail about how it should go and what it should look like when done.

I am not trying to be an alarmist, only a realist about how tricky the job could be. I hate to think of my HTS mates hollering about nightmare repair jobs &/or unsatisfactory results.
 

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I am also waiting for a final solution from DSP having a second gen UMIC ser 387 but i have a question about sensitivity between the 20 db and the new 10 db calibration file. They both look exactly the same on measurement but are 5 db apart in sensitivity, one showing sensitivity factor -24.2721 for 10 hz the other -21.1 for the 20 hz file. Which measurement is correct.

Thanks for any help
New to rew trying to learn.
 

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Here is what I am trying to visualize. The mic capsule has a pair of wires, probably twisted, going to the circuit board. That twisted pair has to be long enough to be stretched out so the circuit board can be pulled out all the way so the connection point for that pair of wires is exposed, so they can be unsoldered and resoldered to the new board. All this without removing the mic capsule which is - glued? pressed? screwed? - into place, and hopefully without accidentally breaking one of the connections at the capsule, which would be impossible to get at to repair without removing the capsule and the tiny screen over it, if it even can be done safely and without special tooling, and then re-screwing/gluing/pressing it into place (plus the screen, however it is retained). Then you have the extra wire to get pushed back into the tube - how was it originally arranged at factory assembly, folded back and forth? stretched along the circuit board? nicely coiled? is it even possible to duplicate the original arrangement/positioning of the wire without duplicating the entire assembly process? does it matter? is any kind of capacitive coupling a concern, with possible affect on high-frequency response if that extra wire positioning is done "poorly," whatever that may be? Then the extra wire is pushed back into the tube by the new circuit board as it is re-inserted. Is there anything it might catch on, causing it to be pulled out of proper position/pushed into a bad position/break a connection/get pinched and broken/get pinched and have conductor exposed to short against the outer tube/get pinched and jam the circuit board so it cannot be inserted or removed without damage? Or what if the extra wire gets balled up wrong and holds the board from sliding in all the way easily, is it OK to push a little? how hard?..... I could go on.

All this and when the DIY repairer is done, she/he expects to have a precision instrument that meets factory specs and is reliable and performs within a fraction of a dB of the curve that was measured at the factory.

Granted, my one experience opening a tubular-construction condenser mic was 99% negative, and I was a bit obsessive about getting it back together just right (which never happened, it is still in pieces), and maybe the UMIK-1 design will be easy to work with, but based on my experience and having a bit of an idea how mics like that are constructed... I would not sign up to do that work without knowing a lot of detail about how it should go and what it should look like when done.

I am not trying to be an alarmist, only a realist about how tricky the job could be. I hate to think of my HTS mates hollering about nightmare repair jobs &/or unsatisfactory results.


Exactly

What if the DIY ends up wrecking etc the mic does the DIY get a refund or new mic?

Wouldn't it be in the interest of DSP to admit there faults and just replace the mics concerned?

Economics would say sending a new mic to the owners better than sending the old ones back to get repaired then freight (there and back). Their cost price would determine this.
 

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At what number does batch 2 start? I have one that is definitely batch 1, but I'm not sure if my other one is batch 2.

Today I did a little experiment with my batch 1 mic and compared the response with the original cal file against the newer cal file. The two plots look nearly identical, which makes me feel pretty good about all the measurements I've taken with the old cal file.
 

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At what number does batch 2 start? I have one that is definitely batch 1, but I'm not sure if my other one is batch 2.

Today I did a little experiment with my batch 1 mic and compared the response with the original cal file against the newer cal file. The two plots look nearly identical, which makes me feel pretty good about all the measurements I've taken with the old cal file.
First batch UMIKs end at the serial #188 and second batch UMIKs are serial #190-539... there is no serial #189 :huh: appears third batch is serial #540-???

I suspect the biggest difference you'll find between files in the first batch is below 20Hz response. With the second batch it is any thing below 990Hz and basically gets worse the lower you measure but there are other issues with these UMIKs beyond just the crazy calibration file.
 
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