Dayton OmniMic Precision Measurement System - Page 70 - AVS Forum
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post #2071 of 2090 Old 01-31-2014, 03:34 AM
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Makes sense! I saw that thread but ignored it due to it being REW, not Omni...

I purchased omni because it does appear to be better or easier for a first time user...worth the extra $$ for me.
You are right on point regarding interpretation of graphs.
thanks!!

Have a Happy and safe New Year!!!
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post #2072 of 2090 Old 01-31-2014, 04:00 AM
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Quote:
Originally Posted by 316 View Post

Makes sense! I saw that thread but ignored it due to it being REW, not Omni...

I purchased omni because it does appear to be better or easier for a first time user...worth the extra $$ for me.
You are right on point regarding interpretation of graphs.
thanks!!

 

Yes, OM is much easier to get started with and it is a great product. Do come on over to the REW thread though for info on what the measurements actually mean etc. No matter what produces the graphs, the info is the same.

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post #2073 of 2090 Old 01-31-2014, 04:14 AM
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Is it the bottom or second to bottom link? Edit: got it..cool!

Have a Happy and safe New Year!!!
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post #2074 of 2090 Old 03-05-2014, 06:27 PM
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anyone here in NY area know how to perform REW or the daytom omnimic? i will pay just to locate the best place for my sub. thanks.

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post #2075 of 2090 Old 03-05-2014, 06:52 PM
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Quote:
Originally Posted by caloyzki View Post

anyone here in NY area know how to perform REW or the daytom omnimic? i will pay just to locate the best place for my sub. thanks.

Google sub crawl. I take it you don't own omnimic? Its literally self explanatory to use the omnimic disc with laptop.

Here you go....

http://www.audioholics.com/home-theater-connection/crawling-for-bass-subwoofer-placement

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post #2076 of 2090 Old 03-05-2014, 10:47 PM
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Quote:
Originally Posted by caloyzki View Post

anyone here in NY area know how to perform REW or the daytom omnimic? i will pay just to locate the best place for my sub. thanks.


It's really very simple.

You put your subwoofer in your normal viewing spot and then walk around playing the subwoofer pulse tone and see where you get the best response that's practical. Obviously, you don't want to put the sub where someone would trip over it.

Do you already own the omnimic?

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post #2077 of 2090 Old 03-06-2014, 04:34 AM
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Okay i will try to do that when i get home. As per audiovideo told me. I'm sorry i never own any omnimic.

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post #2078 of 2090 Old 03-06-2014, 04:40 AM
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Quote:
Originally Posted by caloyzki View Post

Okay i will try to do that when i get home. As per audiovideo told me. I'm sorry i never own any omnimic.

My intended reply in the above was to say that you walk around the room with your microphone and laptop in hand and find the spot where you get the flattest response. It presumes that you have Omnimic and are running it while going around the room.

From a practical standpoint, I've always been able to locate subwoofers when they're not right next to the display. I find that more annoying than the frequency response being off a bit.

It also depends a lot on your receiver/preamp and if it has Audyssey and which version it has. The latest version does a pretty good job of equalizing your sub.

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post #2079 of 2090 Old 03-06-2014, 04:57 AM
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okay im sorry, i misunderstood that. dont have any gear like omnimin. i only rely om my audysy from tha avr which is the audysy XT. and i place my sub next to my front R speaker.

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post #2080 of 2090 Old 03-20-2014, 11:25 AM
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Greetings

I just got an OmniMic V2 system yesterday and ran a quick test using test disc tracks 2,6 and 12: processor is a Marantz 8801 with Audyssey on

I saw a significant drop (about 5db) in the frequency response curve around 1.5Khz in stereo test: I did not see it on the individual L/R tests: any guidance what this might mean?

I realize I have a lot to learn from this system: I just need some pointers to get started

tia

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post #2081 of 2090 Old 03-20-2014, 12:15 PM
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Could be phase cancellation at that frequency in the position of the mic.  Have you tried a few positions?


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post #2082 of 2090 Old 03-20-2014, 12:18 PM
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Most definitely what Kal said.  If you don't have the mic exactly between the L and R speakers then some amount of cancellation will occur with the L+R measurement.

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post #2083 of 2090 Old 03-20-2014, 01:42 PM
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And keep in mind if you are using the Audyssey reference curve there is a built in dip of 3db centered at 2khz.  That doesn't explain why is it in some but not all measurements.

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post #2084 of 2090 Old 03-20-2014, 01:45 PM
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^^^

thanks: that makes sense: I will try different mic positions and Audyssey on/off

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post #2085 of 2090 Old 03-20-2014, 02:03 PM
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Quote:
Originally Posted by markrubin View Post

^^^

thanks: that makes sense: I will try different mic positions and Audyssey on/off

You should be able to switch between the Audyssey reference curve and the Flat (Music) curve and see the dip disappear along with the high frequency rolloff.

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post #2086 of 2090 Old 03-21-2014, 11:55 AM
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Quote:
Originally Posted by markrubin View Post

Greetings

I just got an OmniMic V2 system yesterday and ran a quick test using test disc tracks 2,6 and 12: processor is a Marantz 8801 with Audyssey on

I saw a significant drop (about 5db) in the frequency response curve around 1.5Khz in stereo test: I did not see it on the individual L/R tests: any guidance what this might mean?

I realize I have a lot to learn from this system: I just need some pointers to get started

tia

Be mindful, it's important to know that we don't hear in the same manner in which the mic collects and represents it's FR measurements ... energy over time, and the reverberant field, impact us in ways so different from how a mic measures.

In fact, the frequency range in which you mentioned, there's so much at work; that range is so susceptible to comb filtered destructive interference, also there's HRTF, the effect the listener's head has upon the way we hear and localize the sound-field using different cues.

Yeah, Audyssey could cause and does cause FR changes. But we're fortunate to be able to psycho-acoustically hear through a great deal of acoustic distortions that the both the room and the loudspeakers impart upon the experience.

Don't sweat it, besides typically FR changes via EQ should only be performed within the modal region. So it is what it is (can't fix a non-minimum phase issue with EQ).



Have fun with the OmniMic, it's great.
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post #2087 of 2090 Old 05-17-2014, 09:56 AM
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Ok I *almost* feel embarrassed to ask, but the instruction were vague, for me at least, with respect to a couple of minor things.

1) I have Omnimic v1, with Audio Test Tracks ver3. I didn't see a track listing anywhere. I am not so interesting in measuring the freq response of the 2 channel system as much as I am interested in measuring of a single speaker and individual drivers (I know about using a cap for the tweeter). Is there any specific track I need to use when connecting only one channel of my amp up? Just wasn't clear if Omnimic was expecting a certain level for 2 speakers. I assume it matters not.

2) Can you now use the mic with other software programs like HOLM, REW or Arta?

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post #2088 of 2090 Old 05-29-2014, 11:54 AM
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I'm getting ready to start/complete some room treatments.

I'd like a with and without impulse measurement. I've already captured frequency responses, I'd like to do the impulse test to see if my RC30 and Acoustic ceiling tile treatment, and 3" foam, and OC703 and Rockwul AT panels actually do what I purchased them to do.

Can someone give me the quick launch summary for the impulse test function to make it a useful capture and comparison using my omnimic? Any other measurements I should be trying?

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post #2089 of 2090 Old 05-29-2014, 11:57 AM
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^^^^^

Ugh, wish I could help but I am looking for the best answer to this too. redface.gif

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post #2090 of 2090 Old 05-29-2014, 12:24 PM
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Quote:
Originally Posted by AudioJosh View Post

Ok I *almost* feel embarrassed to ask, but the instruction were vague, for me at least, with respect to a couple of minor things.

1) I have Omnimic v1, with Audio Test Tracks ver3. I didn't see a track listing anywhere. I am not so interesting in measuring the freq response of the 2 channel system as much as I am interested in measuring of a single speaker and individual drivers (I know about using a cap for the tweeter). Is there any specific track I need to use when connecting only one channel of my amp up? Just wasn't clear if Omnimic was expecting a certain level for 2 speakers. I assume it matters not.

2) Can you now use the mic with other software programs like HOLM, REW or Arta?

 

I'd PM the guy who wrote the manual.  He goes by Bill Waslo. :)

 

http://www.daytonaudio.com/OmniMicV4/index_OmniMic.html

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