Dayton OmniMic Precision Measurement System - Page 22 - AVS Forum
Forum Jump: 
Reply
 
Thread Tools
post #631 of 2095 Old 02-03-2011, 12:33 PM
AVS Special Member
 
t6902wf's Avatar
 
Join Date: Aug 2008
Location: SE Michigan
Posts: 1,669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
Quote:
Originally Posted by exojam View Post
i agree with warp on the cs aspect of this product. Since it includes software that can-will be modified we should have an area to contact the vendor for this and not only by phone. I know that they have threads over at the pe forum but they are in the general diy section (that i have found). I believe they should do something like put a sticky in the pro sound area so we can ask questions and post graphs (if the question is about one so we can show them what we are looking at). This way, if we have questions that are addressed on a phone call we do not have to try our best to document anything we are told on that call and then turn around and put it out for anyone else who may have the same question. In a forum the question and answer is right there for everyone to get data from.

Just my thoughts.

James
+1

T6

Clearwave 4TSE and 4CC build thread
http://www.avsforum.com/avs-vb/showt...1#post19489740
t6902wf is offline  
Sponsored Links
Advertisement
 
post #632 of 2095 Old 02-03-2011, 12:38 PM
AVS Special Member
 
t6902wf's Avatar
 
Join Date: Aug 2008
Location: SE Michigan
Posts: 1,669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
And there it is.

T6

Clearwave 4TSE and 4CC build thread
http://www.avsforum.com/avs-vb/showt...1#post19489740
t6902wf is offline  
post #633 of 2095 Old 02-03-2011, 01:05 PM
AVS Addicted Member
 
noah katz's Avatar
 
Join Date: Apr 1999
Location: Mountain View, CA USA
Posts: 20,475
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 176 Post(s)
Liked: 149
Quote:
Originally Posted by DaytonAudio View Post
The new version allows the users to adjust the form size of the OmniMic software to full screen and also allows the user to subtract response curves.
Great!, thanks!

Noah
noah katz is offline  
post #634 of 2095 Old 02-03-2011, 01:14 PM
AVS Club Gold
 
Mike_WI's Avatar
 
Join Date: Mar 2008
Location: SE Wisconsin
Posts: 2,507
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 11
Quote:
Originally Posted by DaytonAudio View Post
It has come to our attention that a limited number of OmniMic user are experiencing erratic measurments and abnormally high readings in the 60Hz region. We have found that this could be caused by a bad ground.

The Panasonic capsule at the tip needs to be grounded through the microphone body and then to the internal pc board. If the microphone capsule is not grounded to the internal pcb, the microphone readings will be erratic and will pick up 60Hz electrical noise. We have identified the problem and have tested all existing units and are taking steps to eliminate it on future production runs. It is an isolated problem and is only effecting a small number of microphones.

If you suspect that your microphone has a grounding problem, a quick check can be performed. Proper ground can be confirmed by using a DMM and checking continuity from the USB connector shield (metal trim along the outside of the connector) to the capsule tip of the microphone body. A resistance reading up to 20 ohms is acceptable. If you find your OmniMic has a grounding issue, please contact Parts Express for a replacement.

On a positive note, we would like to anounce the release of a new OmniMic software version 2.03. The new version allows the users to adjust the form size of the OmniMic software to full screen and also allows the user to subtract response curves. The new version also address an install bug that a few users have experienced. You can download the new software by going to the #390-790 OmniMic product page on the Parts Express website.
Sounds promising.

I'm getting closer to "biting" on this if things are fixed.

Mike
Mike_WI is offline  
post #635 of 2095 Old 02-03-2011, 01:16 PM
HOME THEATER CONTRACTOR
 
BIGmouthinDC's Avatar
 
Join Date: Jan 2003
Location: Northern VA
Posts: 20,711
Mentioned: 2 Post(s)
Tagged: 1 Thread(s)
Quoted: 229 Post(s)
Liked: 580
Anyone have a good example of the use of the subtraction function?
BIGmouthinDC is online now  
post #636 of 2095 Old 02-03-2011, 01:46 PM
AVS Addicted Member
 
noah katz's Avatar
 
Join Date: Apr 1999
Location: Mountain View, CA USA
Posts: 20,475
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 176 Post(s)
Liked: 149
You mean an actual example or an example of when it would be used?

If the latter, to subtract before and after Audyssey responses to see exactly what Audyssey has done, as opposed to eyeballing the differences between the two graphs.

Noah
noah katz is offline  
post #637 of 2095 Old 02-03-2011, 01:59 PM
 
woofster's Avatar
 
Join Date: Jan 2011
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
The program calls it "normalize" not "subtract", but think that's what is meant
woofster is offline  
post #638 of 2095 Old 02-03-2011, 04:50 PM
FOH
AVS Special Member
 
FOH's Avatar
 
Join Date: Apr 2010
Location: Midwest
Posts: 4,747
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Liked: 208
I e-mailed Dayton at 3 pm this afternoon politely explaining the situation;

"As one of the first, if not the first purchasers of the OmniMic rig, I'm certainly enjoying it's feature set and versatility. As with any software product, shortcomings come to the fore, inevitable upgrades, and system tweaks are considered. I'd like to where the revised software situation stands. It's been brought to my attention that software revisions may be available, if this is the case, I certainly could use a copy asap.

I contacted Skip, a rep from Parts Express, and he was not aware of any, in fact he stated it would be quite some time before any changes would be made. As a avid AVS forum member, I'm part of a community of users that have many thoughts concerning this product. We discuss this product many times a day on-line. Also, I posted a question regarding the revisions at the PE TechTalk forum, in the OmniMic thread, also, no answer. A short time ago, I called for information, all exchanges I tried rolled to voice mail.

I hope you can help me in this regard. Thank you very much.
"



A management team member, emailed me back a short time later, with a very short message that included the link to the revision, and an invitation to contact him if there were any additional questions.

I've downloaded the revision, and a couple quick notes; the RTA seems more responsive, likely an effect of the larger display but it sure seems quicker. I've always felt it was sluggish, but either way, not that significant. I'm glad they've isolated the intermittent grounding issue, I've not experienced any problems however I'm glad that issue has apparently been solved. I do wish the maximizing was done in a little more symmetrical manner. Really splitting hairs with complaints like this. The first, and most important issue is how the software performs it's various acoustic measurements.

I do appreciate the expediency of which this was handled today. I sincerely hope the support begins to take shape, and continues with consistency.



Thanks

------------------------------------
Flat, Deep, Clean, Linear, and Loud
------------------------------------
Active 16.8kw, 7.3 system
(3)Seaton Cat12C up front, (4)QSC K8 sides/rears
(2)Seaton SubM-HP, (4)18" IB
FOH is offline  
post #639 of 2095 Old 02-03-2011, 06:36 PM
Member
 
bikinpunk's Avatar
 
Join Date: Jan 2007
Posts: 174
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
Quote:
Originally Posted by bikinpunk View Post

This may have been answered somewhere, but I've not seen it discussed yet: how does the oscilloscope portion of this program actually function?
Knowing the only hardware is a mic and usb cord, I can't see how one can take measurements of an audio signal to determine the waveform. Furthermore, the input voltage would have to be high as to keep from frying an input.... so, how exactly does this particular function work? Is it based off SPL measurements, somehow? If so, how does one keep from frying a speaker?

I'm sure this is a simple answer... I've just not found it.

Thanks in advance.

Bumping this for an answer, in case it was lost in the thread.
bikinpunk is offline  
post #640 of 2095 Old 02-03-2011, 07:23 PM
Advanced Member
 
bwaslo's Avatar
 
Join Date: Jul 2006
Posts: 817
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Liked: 76
bikinpunk-

The OM oscilloscope shows acoustic waveforms, not electrical ones. As you pointed out, there are no probes that would be needed to sense a voltage. What is shown is the plot of pressure on the microphone diaphragm vs time. It does not have to be high level. For instance, if you whistle into the mic, you can see the waveform of the sound.

It might be used to look at the TIME DOMAIN shape of tonebursts (though the toneburst storage Waterfall display shows that information better) or to check claims that a speaker could reproduce square waves. To do that, you might apply a square wave signal from a function generator to the speaker and look at it with the Oscilloscope.* Or play a wav file or CD track containing a square wave.

That said, if you have no need for this function, it doesn't need to be used. It is just a capability that the hardware was capable of supporting and which seemed like it can be handy at times.

*however, you should be VERY CAREFUL when applying steady tones of any type to a loudspeaker. In particular, at very high frequencies where ears aren't very sensitive, it's easy to burn out a tweeter by trying to play continuous tones through them at much volume as they are not normally designed or required to sustain that kind of signal.

If you do look at a speaker for square wave response (in case you think such may be important -- I, personally, don't) bear in mind it is only possible for square waves at frequencies between about 200Hz and 2kHz, because frequencies between f/10 to f*10 are usually needed to be reproduced to show all the harmonics and step response needed to make a waveform that looks square.

DIY Synergy horn spreadsheet http://libinst.com/SynergyCalc/
XSim -free crossover designer and simulator http://libinst.com/Xsim/XSimSetup.exe
bwaslo is online now  
post #641 of 2095 Old 02-04-2011, 10:20 AM
Member
 
bikinpunk's Avatar
 
Join Date: Jan 2007
Posts: 174
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
^ thank you very much for the clarification!


Does anyone know if this dayton program will allow you to plot polars like praxis does? That would be an awesome feature, if so. I shy away from it on praxis because it seems pretty complicated. Heck, the UI of praxis, as a whole, is a bit complicated to me.
bikinpunk is offline  
post #642 of 2095 Old 02-04-2011, 03:27 PM
AVS Addicted Member
 
noah katz's Avatar
 
Join Date: Apr 1999
Location: Mountain View, CA USA
Posts: 20,475
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 176 Post(s)
Liked: 149
I just realized something - it might be really inconvenient getting responses for individual speakers.

Right now all I can think of is changing speaker configuration combined with unplugging speaker wires.

Which isn't too awful for me, as mine have banana plugs.

Anyone have any better ideas?

Noah
noah katz is offline  
post #643 of 2095 Old 02-04-2011, 04:04 PM
HOME THEATER CONTRACTOR
 
BIGmouthinDC's Avatar
 
Join Date: Jan 2003
Location: Northern VA
Posts: 20,711
Mentioned: 2 Post(s)
Tagged: 1 Thread(s)
Quoted: 229 Post(s)
Liked: 580
From what I could determine the test tones are only stereo so you are limited to what breakouts you can do with your receiver. Luckily I have other setup disks that rotate tones among all the speakers.
BIGmouthinDC is online now  
post #644 of 2095 Old 02-04-2011, 04:16 PM
 
woofster's Avatar
 
Join Date: Jan 2011
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Balance control?
woofster is offline  
post #645 of 2095 Old 02-04-2011, 04:21 PM
AVS Special Member
 
t6902wf's Avatar
 
Join Date: Aug 2008
Location: SE Michigan
Posts: 1,669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
It seem the spl meter reset stopped working with the software update.

T6

Clearwave 4TSE and 4CC build thread
http://www.avsforum.com/avs-vb/showt...1#post19489740
t6902wf is offline  
post #646 of 2095 Old 02-04-2011, 04:31 PM
FOH
AVS Special Member
 
FOH's Avatar
 
Join Date: Apr 2010
Location: Midwest
Posts: 4,747
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Liked: 208
Yes, I contacted them earlier today with this and a couple other issues as well.

------------------------------------
Flat, Deep, Clean, Linear, and Loud
------------------------------------
Active 16.8kw, 7.3 system
(3)Seaton Cat12C up front, (4)QSC K8 sides/rears
(2)Seaton SubM-HP, (4)18" IB
FOH is offline  
post #647 of 2095 Old 02-05-2011, 09:51 AM
AVS Addicted Member
 
noah katz's Avatar
 
Join Date: Apr 1999
Location: Mountain View, CA USA
Posts: 20,475
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 176 Post(s)
Liked: 149
Quote:
Originally Posted by BIGmouthinDC View Post

From what I could determine the test tones are only stereo so you are limited to what breakouts you can do with your receiver.

Guess I'll have to use party mode and disconnect all but one speaker.

Quote:
Originally Posted by BIGmouthinDC View Post

Luckily I have other setup disks that rotate tones among all the speakers.

The instructions are emphatic about only using their test signal.

I wonder what the chances are of getting Dayton to make 7 ch DVD version.

Noah
noah katz is offline  
post #648 of 2095 Old 02-05-2011, 11:16 AM
HOME THEATER CONTRACTOR
 
BIGmouthinDC's Avatar
 
Join Date: Jan 2003
Location: Northern VA
Posts: 20,711
Mentioned: 2 Post(s)
Tagged: 1 Thread(s)
Quoted: 229 Post(s)
Liked: 580
Quote:
Originally Posted by noah katz View Post

The instructions are emphatic about only using their test signal.

I would think it really doesn't matter which cd/dvd you use to check the balance of speaker levels (SPL) for that matter I think my receiver sends out test tones.
BIGmouthinDC is online now  
post #649 of 2095 Old 02-05-2011, 12:05 PM
AVS Special Member
 
exojam's Avatar
 
Join Date: Dec 2004
Location: MA
Posts: 2,549
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 26
I used the test tones from processor with the SPL tab to set all my speakers at 75db. Since there is no track to do this with I thought it would (and did) work just fine.

James
exojam is offline  
post #650 of 2095 Old 02-05-2011, 12:08 PM
AVS Special Member
 
t6902wf's Avatar
 
Join Date: Aug 2008
Location: SE Michigan
Posts: 1,669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
Quote:
Originally Posted by exojam View Post

i used the test tones from processor with the spl tab to set all my speakers at 75db. Since there is no track to do this with i thought it would (and did) work just fine.

James

+1

T6

Clearwave 4TSE and 4CC build thread
http://www.avsforum.com/avs-vb/showt...1#post19489740
t6902wf is offline  
post #651 of 2095 Old 02-06-2011, 11:14 AM
AVS Addicted Member
 
noah katz's Avatar
 
Join Date: Apr 1999
Location: Mountain View, CA USA
Posts: 20,475
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 176 Post(s)
Liked: 149
That may be fine for SPL; I was talking about the one to measure freq response.

Noah
noah katz is offline  
post #652 of 2095 Old 02-06-2011, 03:30 PM
Senior Member
 
heja's Avatar
 
Join Date: Dec 2005
Posts: 317
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
I wish they can make a test record in multichannel were you can choose witch cannel that are sent test signal. Alt least a couple of Denon receivers i have measured with REW have built in a separate EQ curve (way down in the treble region) for the all cannel stereo setting so using this preset and disconnecting speakers is not a good idea.

Anyone that have the tools to make a electable multichannel (7.1 ideally) version of the CD.
heja is offline  
post #653 of 2095 Old 02-06-2011, 08:31 PM
AVS Addicted Member
 
Kal Rubinson's Avatar
 
Join Date: Mar 2004
Location: NYC + Connecticut
Posts: 28,428
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 60 Post(s)
Liked: 126
Quote:
Originally Posted by heja View Post

Anyone that have the tools to make a electable multichannel (7.1 ideally) version of the CD.

It is easy enough to make a disc with separate tracks for each channel. Rip the original and burn a multichannel disc with the signal assigned to the intended channel(s). It can be done with dts on a CD/DVD or discrete PCM on a DVD/A.

Kal Rubinson

"Music in the Round"
Senior Contributing Editor, Stereophile
http://www.stereophile.com/category/music-round

Kal Rubinson is online now  
post #654 of 2095 Old 02-06-2011, 09:30 PM
HOME THEATER CONTRACTOR
 
BIGmouthinDC's Avatar
 
Join Date: Jan 2003
Location: Northern VA
Posts: 20,711
Mentioned: 2 Post(s)
Tagged: 1 Thread(s)
Quoted: 229 Post(s)
Liked: 580
Maybe somebody could do the heavy lifting, create the file and seed a torrent with a file that we could all download and burn.
BIGmouthinDC is online now  
post #655 of 2095 Old 02-07-2011, 11:00 AM
Member
 
bikinpunk's Avatar
 
Join Date: Jan 2007
Posts: 174
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 14
When testing a single speaker which requires a higher crossover, such as a tweeter, what are you guys doing to make sure the speaker isn't fried?... using an external crossover either passively or actively?
bikinpunk is offline  
post #656 of 2095 Old 02-08-2011, 03:23 AM
Senior Member
 
heja's Avatar
 
Join Date: Dec 2005
Posts: 317
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Quote:
Originally Posted by BIGmouthinDC View Post

Maybe somebody could do the heavy lifting, create the file and seed a torrent with a file that we could all download and burn.

Yes please
heja is offline  
post #657 of 2095 Old 02-09-2011, 09:12 AM
HOME THEATER CONTRACTOR
 
BIGmouthinDC's Avatar
 
Join Date: Jan 2003
Location: Northern VA
Posts: 20,711
Mentioned: 2 Post(s)
Tagged: 1 Thread(s)
Quoted: 229 Post(s)
Liked: 580
I don't know if anyone else thinks the microphone clip that came with the kit is a little lacking, rather than waiting for it to break I ordered an upgrade.

This one works:



http://www.amazon.com/Stage-MY325-Dy...7271239&sr=8-4
BIGmouthinDC is online now  
post #658 of 2095 Old 02-09-2011, 09:24 AM
AVS Special Member
 
t6902wf's Avatar
 
Join Date: Aug 2008
Location: SE Michigan
Posts: 1,669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
Quote:
Originally Posted by BIGmouthinDC View Post
I don't know if anyone else thinks the microphone clip that came with the kit is a little lacking, rather than waiting for it to break I ordered an upgrade.

This one works:



http://www.amazon.com/Stage-MY325-Dy...7271239&sr=8-4
I agree completely. Thanks for the tip.

T6

Clearwave 4TSE and 4CC build thread
http://www.avsforum.com/avs-vb/showt...1#post19489740
t6902wf is offline  
post #659 of 2095 Old 02-09-2011, 10:33 AM
AVS Special Member
 
t6902wf's Avatar
 
Join Date: Aug 2008
Location: SE Michigan
Posts: 1,669
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
Can damage be done to a sub running the Omni Mic Sine wave FR tone for an extended period of time at 80 db?

Extended being 10 minutes.

T6

Clearwave 4TSE and 4CC build thread
http://www.avsforum.com/avs-vb/showt...1#post19489740
t6902wf is offline  
post #660 of 2095 Old 02-09-2011, 11:36 AM
AVS Special Member
 
cavchameleon's Avatar
 
Join Date: Jul 2006
Location: Albuquerque, NM
Posts: 1,527
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked: 52
Don't have this mic yet (want it after all the discussion, thanks). As far as mounts, if you want a suspension type mount, this one is not too expensive and works very well at isolating the mic from the stand. I use this for all my 'pencil' type microphones, including my calibration mics used with REW.

http://pro-audio.musiciansfriend.com...unt?sku=271295


Ray

 

"Listen with an open heart and mind."

 

cavchameleon is offline  
Reply DIY Speakers and Subs

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off