Massively clipped UMIK-1 - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 117 Old 12-08-2014, 04:32 PM - Thread Starter
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Massively clipped UMIK-1

Listen to the UMIK-1 clip itself to death. 130db my butt!
This is 4 LMS's and my 2 mains at full blast; it should be able to handle it better than that. (My 1 cent Sanyo mic handles it no problem.)

As soon at the SPL goes above 105db, bam, clipping!


Has anyone successfully modded theirs back down to 0db gain yet, to get the full 123-130db out of it?
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post #2 of 117 Old 12-08-2014, 04:33 PM
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post #3 of 117 Old 12-08-2014, 06:21 PM
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Sounds great ! :-)

The mic is SPL rated at 1 kHz. Not 20 or 50 Hz. At 1 kHz the diaphragm only has to move a little compared to the bass. I'm sure that is the reason.
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post #4 of 117 Old 12-08-2014, 06:28 PM
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I see compression clearly visible over 120db
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post #5 of 117 Old 12-08-2014, 06:42 PM
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Yeah I started to measure compression and high distortion at 105 dBs too. I stopped using it as my RS meter was better at higher levels except the levels are still low. It would show my 12 18's compress at 105 dBs with like 30%THD at 10hz. The SI can hit 95 dbs outside and 12 adds 21 dBs and my room adds 20 dBs.
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post #6 of 117 Old 12-08-2014, 07:50 PM
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I just asked minidsp about it and they replied:

"The max level is a simple internal switch to control the analog gain. Knowing that 90% of applications is to deal with speaker measurements, we tune the internal DIP switch gain for higher gain (default is 18dB).
If you want high SPL level, simply rotate the ring at the rear of the mic (i.e. ring around the USB connector). It will come out and allow you to “slowly” pull the microphone PCB board. You can then use the small DIP switch to modify the gain to a low value.
See the rear of the PCB. There is table showing the gain settings."
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post #7 of 117 Old 12-09-2014, 12:27 AM - Thread Starter
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So I opened it up and set it to 0db. It goes to over 120db now; and matched within 1db of my CM-140.
But now it's a little too insensitive, especially it the far-field (LP etc). I think 6db might be a better setting overall, I'm gonna try that instead.





Not sure what is up with the double zero. I assume 3db, but maybe not.

I'm sure if you set it to 36db you could turn it into a 300ft peeping tom mic. Just need some 8megapixel backscatter x-ray goggles and then...
Giggity Giggity!
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post #8 of 117 Old 12-09-2014, 07:39 AM
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Mine was set at 12db from the factory instead of 18db...

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post #9 of 117 Old 12-09-2014, 07:52 AM
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Quote:
Originally Posted by BassThatHz View Post
So I opened it up and set it to 0db. It goes to over 120db now; and matched within 1db of my CM-140.
But now it's a little too insensitive, especially it the far-field (LP etc). I think 6db might be a better setting overall, I'm gonna try that instead.





Not sure what is up with the double zero. I assume 3db, but maybe not.

I'm sure if you set it to 36db you could turn it into a 300ft peeping tom mic. Just need some 8megapixel backscatter x-ray goggles and then...
Giggity Giggity!
Thanks for the pictures, I was nervous to try this but now that I see the insides of the mic it should be very easy. Let us know how you like the 6db setting.

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post #10 of 117 Old 12-09-2014, 08:15 AM
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This is great info.....When I run REW sweeps I keep getting a clip warning with anything above 100db. I'm going to adjust my mic and see if anything changes.
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post #11 of 117 Old 12-09-2014, 09:05 AM
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Do you believe the calibration file will still be accurate after adjusting the gain?
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post #12 of 117 Old 12-09-2014, 09:23 AM
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Quote:
Originally Posted by Samps View Post
Do you believe the calibration file will still be accurate after adjusting the gain?
The sensitivity won't be.

I adjusted my UMIK from 12db gain to 0db. I then changed the sensativity in the calibration file:

From: "Sens Factor =-8.298dB, SERNO: 7001459"

To: "Sens Factor =-20.298dB, SERNO: 7001459"

It now measures exactly the same, but with additional headroom before clipping.
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post #13 of 117 Old 12-09-2014, 09:24 AM
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Quote:
Originally Posted by lukeamdman View Post
The sensitivity won't be.

I adjusted my UMIK from 12db gain to 0db. I then changed the sensativity in the calibration file:

From: "Sens Factor =-8.298dB, SERNO: 7001459"

To: "Sens Factor =-20.298dB, SERNO: 7001459"

It now measures exactly the same, but with additional headroom before clipping.
This is perfect, Thanks!

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post #14 of 117 Old 12-09-2014, 10:26 AM
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Quote:
Originally Posted by lukeamdman View Post
The sensitivity won't be.

I adjusted my UMIK from 12db gain to 0db. I then changed the sensativity in the calibration file:

From: "Sens Factor =-8.298dB, SERNO: 7001459"

To: "Sens Factor =-20.298dB, SERNO: 7001459"

It now measures exactly the same, but with additional headroom before clipping.
What does it clip at now?
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post #15 of 117 Old 12-09-2014, 10:27 AM
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post #16 of 117 Old 12-09-2014, 10:42 AM
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Excellent thread, thanks for sharing

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post #17 of 117 Old 12-09-2014, 10:50 AM
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Quote:
Originally Posted by mlah384 View Post
Do yall point the mic straight up at MLP? If so, do you use the 90 degree calibration file?
I do. Unless I'm doing a near field measurement. Then i use the mic pointed at the speaker with the 0 degree file. Not sure what the 45 degree file is used for.



Why do they set the sensitivity that way? Is it to allow sweeps to be done at a lower volume?
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post #18 of 117 Old 12-09-2014, 11:18 AM
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Quote:
Originally Posted by mlah384 View Post
What does it clip at now?
It was fine until ~124-125 before, so I'm guessing I'm fine into the low 130's now.
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post #19 of 117 Old 12-10-2014, 04:18 AM - Thread Starter
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My stock 18db Gain Sens Factor was 0.3dB (which was wrong: about 2.3db to match my CM-140) which clips at 106db.
At 6db gain it needed to be: Sens Factor =-10.3db (to match my CM-140) which should clip at about 125db according to my CM-140 and TermLab; and tracks accurately in REW (+- 0.75db) from 40db on up.
At 36db gain it needed to be: Sens Factor =20.3dB (to match my CM-140) which clips at 95db.
Haven't tried 12db yet... but based on this info, I would imagine is clips at 119db. (On my UMIK at least.)

All the tools I have on hand are telling me that it will only do 131-134db when it clips, with a gain set to 0db.

Last edited by BassThatHz; 12-10-2014 at 04:34 AM.
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post #20 of 117 Old 12-10-2014, 04:23 AM - Thread Starter
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Quote:
Originally Posted by Samps View Post
Why do they set the sensitivity that way? Is it to allow sweeps to be done at a lower volume?
It's geared for john doe's, with weak non-DIY speakers and subs. It's not geared for us bassheads!
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post #21 of 117 Old 12-10-2014, 04:50 AM - Thread Starter
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I think I might buy another UMIK in the future, keep one as 0db gain for taking sweeps from 50db to 132db,

And have the other at 36db for making ambient recordings (or maybe two for stereoscopic!); I'm really surprised at how quiet the noisefloor is on this USB mic, all the other external condenser mics I have for this purpose are complete garbage.
With the UMIK I can pick up all the details. It's like a 10x improvement.
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post #22 of 117 Old 12-11-2014, 03:03 PM
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Does anyone know if there's a similar solution to stop the UMM-6 from clipping??
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post #23 of 117 Old 12-12-2014, 12:28 PM
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Quote:
Originally Posted by lukeamdman View Post
Mine was set at 12db from the factory instead of 18db...

@lukeamdman : Can you show me/us what did you have to do to open the umik and what you did there after it opened? I am not home to look at it. Thanks.
Quote:
Originally Posted by lukeamdman View Post
The sensitivity won't be.

I adjusted my UMIK from 12db gain to 0db. I then changed the sensativity in the calibration file:

From: "Sens Factor =-8.298dB, SERNO: 7001459"

To: "Sens Factor =-20.298dB, SERNO: 7001459"

It now measures exactly the same, but with additional headroom before clipping.
Make perfect sense.
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post #24 of 117 Old 12-12-2014, 04:06 PM - Thread Starter
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This is the highest sound quality video recording I've made to-date, thanks to this mic (mono though...)


This is 36db of gain with high frequency signal shaping applied. (Had to, I noticed it has 9db high frequency roll off when used in the far field, atleast when taking non-sweeps, i.e. music recordings). No clipping this time because I'm keeping it to <95db here.
36db gain has best micro detail retrieval, but least SPL handling. Win some, Lose some.

Last edited by BassThatHz; 12-12-2014 at 04:35 PM.
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post #25 of 117 Old 12-12-2014, 04:22 PM
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I noticed that you sometimes use the black tip cover, but not always. ?
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post #26 of 117 Old 12-12-2014, 04:25 PM - Thread Starter
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Quote:
Originally Posted by tvuong View Post
Can you show me/us what did you have to do to open the umik
I just used the tip of a push pin on the holes and turned it Leftie Loosey. It's threaded as per the pics.

Just make sure when you put it back on, that the holes are facing out, or you will never get it open ever again.
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post #27 of 117 Old 12-12-2014, 04:29 PM - Thread Starter
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Quote:
Originally Posted by Samps View Post
I noticed that you sometimes use the black tip cover, but not always. ?
You only need to use it for outside recordings (wind block), and to protect it from dust.
Not sure if it blocks the high frequencies, but in both these vids it is off so...

Are you talking about the ECM8000 youtube vids I made back in like 2005?

Last edited by BassThatHz; 12-12-2014 at 04:33 PM.
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post #28 of 117 Old 12-12-2014, 04:58 PM
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I swear I saw either a pic or a video where you made an igloo out of absorption panels and the Umik was inside with the tip cover on. Maybe it was someone else?
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post #29 of 117 Old 12-12-2014, 05:04 PM
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Quote:
Originally Posted by lukeamdman View Post
Mine was set at 12db from the factory instead of 18db...

Quote:
Originally Posted by BassThatHz View Post
I just used the tip of a push pin on the holes and turned it Leftie Loosey. It's threaded as per the pics.

Just make sure when you put it back on, that the holes are facing out, or you will never get it open ever again.
What do you do once it opens? I assume flipping the dip switches? To what? Thanks.
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post #30 of 117 Old 12-13-2014, 05:41 PM
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Quote:
Originally Posted by tvuong View Post
What do you do once it opens? I assume flipping the dip switches? To what? Thanks.

Look at the image of the other side in the original post with the pics. It has a chart for the different settings.


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