Dayton OmniMic Precision Measurement System - Page 28 - AVS Forum
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post #811 of 2112 Old 07-08-2011, 09:08 AM
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No test tones per speaker. I do not believe there is any way to do this without disconnecting each speaker; someone can correct me if I am wrong on that part.

James
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post #812 of 2112 Old 07-08-2011, 09:57 AM
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Quote:
Originally Posted by exojam View Post

No test tones per speaker. I do not believe there is any way to do this without disconnecting each speaker; someone can correct me if I am wrong on that part.

James

Thanks James. Appreciate your input on this post and your great input on the thread.

KE
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post #813 of 2112 Old 07-10-2011, 04:35 PM
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Quote:
Originally Posted by Kal Rubinson View Post

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.

Hi Kal -

Is there any tutorials on how to do this via the web. It would be a pain for me to disconnect each speaker back and forth, as I use bare wires.

Not sure how to assign to each channel? As well as not sure how to create a mulitchannel cd/dvd?

Im not sure how to search for this via google.
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post #814 of 2112 Old 07-10-2011, 06:12 PM
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You need a DVD burning program that lets you assign the channels. i do not think there is a tutorial on this.

Kal Rubinson

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post #815 of 2112 Old 07-10-2011, 11:40 PM
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You could also use multichannel inputs one at a time.

Noah
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post #816 of 2112 Old 07-11-2011, 03:59 AM
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Quote:
Originally Posted by Kal Rubinson View Post

You need a DVD burning program that lets you assign the channels. i do not think there is a tutorial on this.

Quote:
Originally Posted by noah katz View Post

You could also use multichannel inputs one at a time.

Thanks guys-

After hours of searching I found a program called audacity. Which allows you to mute or all together delete channels. I will just try to delete the channels to make a single left and right cd. Then I can use nero just to burn the new saved audio.

Now I just got to try this out to make sure this works. Dont have time right now. Bed time.
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post #817 of 2112 Old 07-11-2011, 07:10 AM
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Quote:
Originally Posted by noah katz View Post

You could also use multichannel inputs one at a time.

Usually, the MCH inputs remain analog and bypass DSP. As a result, you would not be able to measure those aspects of the system with this input.

Kal Rubinson

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post #818 of 2112 Old 07-11-2011, 02:06 PM
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Quote:
Originally Posted by Kal Rubinson View Post

Usually, the MCH inputs remain analog and bypass DSP. As a result, you would not be able to measure those aspects of the system with this input.

Oops, right you are.

Noah
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post #819 of 2112 Old 07-17-2011, 04:21 AM
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Would the Omni fit into any mic stand? Something like this - http://www.parts-express.com/pe/show...43&FTR=242-743 ?

I have not gone through the whole thread, could someone tell me if it is accurate? Better/equal/worse than REW?
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post #820 of 2112 Old 07-17-2011, 05:58 AM
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Yes it fits a standard microphone stand.
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post #821 of 2112 Old 07-17-2011, 10:21 AM
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A question has ben raised here on the Audyssey Pro Installer kit thread as to how OM handles the time alignment for the multiple measurement derived FR summation curve. If anyone has info or cares to comment, it would be most welcome there.

Yes, I still like playing with Dalis.

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post #822 of 2112 Old 07-17-2011, 01:52 PM
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Well I wouldn't think that anyone would want average impulse responses, and I don't believe time domain enters into averaging freq resp.

Noah
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post #823 of 2112 Old 07-17-2011, 03:50 PM
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Quote:
Originally Posted by noah katz View Post

Well I wouldn't think that anyone would want average impulse responses, and I don't believe time domain enters into averaging freq resp.

The time domain affects the phase, summing or averaging responses with magnitude and phase requires time aligned responses. Here is a paper that discusses that in the context of interpolating between responses.
http://fulcrum-acoustic.com/wordpres...ation-2001.pdf
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post #824 of 2112 Old 07-17-2011, 09:12 PM
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Yes, but I don't see the relevance to determining an averaged freq response on which to base EQ.

Noah
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post #825 of 2112 Old 07-18-2011, 08:04 AM
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Quote:
Originally Posted by JohnPM View Post

Here is a paper that discusses that in the context of interpolating between responses.
http://fulcrum-acous7tic.com/wordpre...ation-2001.pdf

That link's not working - for me, at least.
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post #826 of 2112 Old 07-18-2011, 08:07 AM
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Quote:
Originally Posted by RUR View Post

That link's not working - for me, at least.

A spurious "7" appeared in the middle of it somehow, try it again now.
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post #827 of 2112 Old 08-02-2011, 04:06 PM
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Fellow Omnimic users/owers:
It seems that the ability to save a Frequency Response measurement and recall it later on using the Chart->Add menu feature is missing under the Reverb and Bass Decay tabs. Why wouldn't I be able to compare two or more Bass Decay graphs for example? Such might be the case if you were adding/removing bass traps . . . Is this missing functionality or am I missing something? Is there a workaround? Please advise.

Many thanks!
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post #828 of 2112 Old 08-03-2011, 06:16 PM
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Kevinzoe,

I believe you would be able to compare the top section “Bass Response” but not the bottom “Bass Decay”, not that helps you much though. If you look at the txt file that is created, does it only show the response data?

I know when I saved harmonic distortion graphs, even though it saved the data for which ever ones you select (2nd, 3rd, etc), it will only allow me to reload the response line.

Here is what shows in the saved txt file for a harm test:

Frequency[Hz], dBSPL, dBTotalHD, dBHD2, dBHD3, dBHD4, dBHD5
11.97524 69.8, 26, 8.7, 24.2, 17, 15.9
12.01856 70.1, 27.3, 10.3, 25.8, 17.9, 15.5
12.06202 70.3, 28.3, 11.6, 27.1, 18.6, 15.2
12.10565 70.4, 29.1, 12.5, 28, 19.1, 15
12.14943 70.6, 29.6, 13.2, 28.7, 19.5, 14.8
12.19337 70.6, 30, 13.7, 29.2, 19.8, 14.7
12.23747 70.7, 30.3, 14, 29.5, 20, 14.6
12.28173 70.7, 30.5, 14.2, 29.7, 20.1, 14.6
12.32615 70.7, 30.6, 14.4, 29.9, 20.2, 14.6
12.37073 70.8, 30.7, 14.5, 30, 20.2, 14.5
12.41547 70.8, 30.8, 14.6, 30.1, 20.3, 14.5

Here is it reloaded:
LL
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post #829 of 2112 Old 08-04-2011, 11:43 AM
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Hi Kevin,

Are you still fine tuning the sub location? Any more insights? This week I will be playing with SUBs (2 each of F15HP SE ) gain to match with each other and with the main speakers. Auddyssy set the sub almost 8-10 db more than the mains .

KE
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post #830 of 2112 Old 08-04-2011, 07:30 PM
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Quote:
Originally Posted by exojam View Post

Kevinzoe,

I believe you would be able to compare the top section Bass Response but not the bottom Bass Decay, not that helps you much though. If you look at the txt file that is created, does it only show the response data?

I know when I saved harmonic distortion graphs, even though it saved the data for which ever ones you select (2nd, 3rd, etc), it will only allow me to reload the response line.

Here is what shows in the saved txt file for a harm test:

Frequency[Hz], dBSPL, dBTotalHD, dBHD2, dBHD3, dBHD4, dBHD5
11.97524 69.8, 26, 8.7, 24.2, 17, 15.9
12.01856 70.1, 27.3, 10.3, 25.8, 17.9, 15.5
12.06202 70.3, 28.3, 11.6, 27.1, 18.6, 15.2
12.10565 70.4, 29.1, 12.5, 28, 19.1, 15
12.14943 70.6, 29.6, 13.2, 28.7, 19.5, 14.8
12.19337 70.6, 30, 13.7, 29.2, 19.8, 14.7
12.23747 70.7, 30.3, 14, 29.5, 20, 14.6
12.28173 70.7, 30.5, 14.2, 29.7, 20.1, 14.6
12.32615 70.7, 30.6, 14.4, 29.9, 20.2, 14.6
12.37073 70.8, 30.7, 14.5, 30, 20.2, 14.5
12.41547 70.8, 30.8, 14.6, 30.1, 20.3, 14.5

Here is it reloaded:

Hi exojam,
Thanks for your reply post. I heard from Bill the creator who said (and I'm paraphrasing) that the OM was geared for live measurements and that Freq Response is the only tab where you can save and recall charts. On the other tabs - and of interest to me the Reverb and Bass Decay tabs - you must use the 'Snapshot' to generate a .bmp or ***** image of the chart. So tonight I took it upon myself to try it out.

Reverb Chart: the 'Snapshot' image file only records the measurement line but not the red line that you create when clicking on the graph. But in its defence the chart comes with a title and within the title is the RT60 measurement time.

Bass Decay Chart: only the bottom chart (Freq vs Time) is saved in the image file, not the top freq response chart.
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post #831 of 2112 Old 08-04-2011, 08:23 PM
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Quote:
Originally Posted by KE_Houston View Post

Hi Kevin,

Are you still fine tuning the sub location? Any more insights? This week I will be playing with SUBs (2 each of F15HP SE ) gain to match with each other and with the main speakers. Auddyssy set the sub almost 8-10 db more than the mains .

KE

Hi Ken,
Thanks for your reply. I think I've nailed down the two Rythmik F15 sub locations for now. But if i decide that I want to try high-passing my main speakers (to take the bass load off my 6watt/ch. SET amp) then all bets on sub locations are off and I'd likely need to repeat my 99 location combination excercise.

For those people who haven't seen my heavily treated room, I built side wall baffles that open and close between 0-90degrees to kill slap echo and reduce comb filtering effects. (See picture below.) Tonight I tried varying the bottom side wall baffle from 20degees open to 30 degrees to 40 degrees holding constant the middle and top baffles which are both open to 20 degrees. I took Freq Response, Reverb chart and Bass Decay measurements (see below).

Goal of the exercise was to see what if anything changed when just the bottom side wall baffle changed from 20->30->40 degrees opening.

Firstly, here's a pic of the left side wall baffles etc:


Here is the Freq Response chart. I'm using a 202020 to mean that the top/middle/bottom baffles are open 20 degrees each, whereas 202030 is the same except that the bottom baffle is open to 30 degrees and similar for 202040. The freq response didn't change below 100Hz and above 2Khz to I excluded them. I used the "Sine Sweep" with Track 2 and the "all" setting with 1/24 octave smoothing I think.


Reverb chart 202020 (all baffles open 20 degrees):


Reverb chart 202030 (bottom baffle opened 30 degrees, others unchanged):


Reverb chart 202040 (bottom baffle open 40 degrees, others unchanged):


Bass Decay 202020:


Bass Decay 202030:


Bass Decay 202040:


Freq Response - I think the nod goes to the 202030 baffle positioning.
Reverb - I think the 202030 that has the longest RT60 time gets the nod.
Bass Decay - ooh this one is hard. I think 202040 might have the most level/constant chart but I'm no expert in deciphering them.
Final thought - if the bass decay is very similar between the 202030 and 202040, the given the 202030 nods for Freq Response and Reverb I'm apt to go with the 202030 positioning. Now to experiment with the other 24 baffle combinations . . .

I welcome your thoughts on chart interpretation. Also, would like your thoughts on why the reverb is so low given that I purposely used hard surfaces to preserve the mid/high freq energy . . . humm
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post #832 of 2112 Old 08-05-2011, 04:21 AM
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One other thing regarding the Reverb chart - I chose the freq range between 1.1khz and 5.6khz for the graph so as to focus on the freq range where the ear is most sensitive (I believe). In hind sight, I probably should have chosen a ranage from 500-5khz as the upper end of the Bass Decay chart is 500hz.

The Bass Decay chart was generated using the "Adjust for . . " box checked.

It seems that the three different opening angles have a small effect in the freq and time domains. I'll now do subjective listening tests to see if there are any differences.

I welcome your comment, thoughts etc. Thanks.
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post #833 of 2112 Old 08-05-2011, 08:27 AM
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Kevin,

Thanks for sharing the picture and graphs. Very nice room, I like the room treatment you have on it. I have similar dip at 400 hz. I will try to post some of my room graphs. Just yesterday, I moved my 12" sealed Velodyne sub to the media room. This will be 3rd sub in the room. I am planning to put it on a side table ( 20" tall ), then on to more analysis. My two F15HP-SE are in the front, the 3rd sub will be in the back. Hope this smooths more.

KE
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post #834 of 2112 Old 08-18-2011, 09:39 AM
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Quote:
Originally Posted by KE_Houston View Post

Are there any Test tones available for testing each channel? If not, what are the options available to test each channel for full spectrum, without disconnecting the speakers not in use.

KE

To piggy back on your question, how do you get the test tones to play on all speakers in a 5.1 or higher setup (at the same time) if it is encoded as a stereo CD track and DD Pro Logic, THX, Neo 6, etc. are not an acceptable option?
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post #835 of 2112 Old 08-18-2011, 09:44 AM
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Quote:
Originally Posted by KE_Houston View Post

Are there any Test tones available for testing each channel? If not, what are the options available to test each channel for full spectrum, without disconnecting the speakers not in use?

None that I can see.

Quote:
Originally Posted by D-Nice View Post

To piggy back on your question, how do you get the test tones to play on all speakers in a 5.1 or higher setup (at the same time) if it is encoded as a stereo CD track and DD Pro Logic, THX, Neo 6, etc. are not an acceptable option?

"All Channel Stereo?"

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post #836 of 2112 Old 08-18-2011, 11:47 AM
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Quote:
Originally Posted by Kal Rubinson View Post

None that I can see.

"All Channel Stereo?"

Wouldn't that color the sound like DD ProLogic, Neo 6, etc. would?
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post #837 of 2112 Old 08-18-2011, 05:53 PM
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Quote:
Originally Posted by D-Nice View Post

Wouldn't that color the sound like DD ProLogic, Neo 6, etc. would?

Why? The two "stereo" channels are identical. If you combine them, the result is identical. If you redistribute them to other channels, they remain identical. You still have to pull the connectors to measure only one, of course.

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post #838 of 2112 Old 08-18-2011, 07:07 PM
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Quote:
Originally Posted by Kal Rubinson View Post

Why? The two "stereo" channels are identical. If you combine them, the result is identical. If you redistribute them to other channels, they remain identical. You still have to pull the connectors to measure only one, of course.

Cool. I guess I'm just use to real 5.1 for test tones. All stereo for measurements is just weird.
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post #839 of 2112 Old 08-19-2011, 02:55 PM
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Quote:
Originally Posted by Kal Rubinson View Post

None that I can see.

"All Channel Stereo?"

Hi Kal, D-Nice

I found a DVD which has test tones for each channel. The DVD is for 5.1 channel, hence, no need to disconnect speakers or to run all 5 channel stereo. The DVD can be down loaded for free. Please let me know, if you want me to the put the link here. I don't want to hijack the thread.

KE
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post #840 of 2112 Old 08-19-2011, 04:13 PM
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Quote:
Originally Posted by KE_Houston View Post

Hi Kal, D-Nice

I found a DVD which has test tones for each channel. The DVD is for 5.1 channel, hence, no need to disconnect speakers or to run all 5 channel stereo. The DVD can be down loaded for free. Please let me know, if you want me to the put the link here. I don't want to hijack the thread.

KE

I already have such a disk but will yours run correctly with OmniMic?
If so, please post link here for me and others.

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