Dayton OmniMic Precision Measurement System - Page 58

EQ will only work on the curve that is the red "Average" curve. There are several ways to get a curve into "average":

1) Measure something and click on the "..Averages.." button (or tap the spacebar)
2) Use the "File> Load to Avg Curve" menu (which replaces anything that might be in the average curve
3) Bring a curve in as an "Added Curve" (using the menu by that name). Then RIGHT-click on the "..Averages.." button, that will include the latest Added curve into the ongoing Average curve. You can then remove the Added curve if you want (that won't remove the Average curve or any effects you made on it).

Simplest is to make an Average curve from measurements -- note the plural, EQing to a measurement at one seating position is likely to not sound good, so Average a couple nearby positions. Then save that to an FRD file (File>Save Avg Curve). Then you can load it back with "File> Load to Avg Curve" if you want to work with it later.

Thanks Bill

Found the reason why i couldn't see the curve, it is showing at 2dbspl, i measured at 65. I had to scroll all the way down, have i done something wrong?

what is your target curve? Does that show when youre adjusting?

or are you making an eq curve and tben loading that as an Added?? The eq curve that gets generated should be near 0db, would be a 0dB line if not applying any eq.

Hi Bill

I am loading a normal saved measurement curve (FRD) from the file load as average curve. The curve ends up at 2dbspl have to sroll to see it.

I tried to attach a snapshot.but not working for some reason.

Where is the FRD from? Look at its data in notepad, what are the dbs in the file?If you saved tfrom an Avg curve, did you tell it to offset or invert (don't)

Hi Bill thank you

It is a file that i saved as Saved as Average Curve from the Frequency / Response tab. No i did'nt offset or invert.


I have attached a txt file


Left Main No EQ.txt 8k .txt file

That is the only thread I could find mentioning the iAudioInterface2...

It does:
A whole bunch of SPL related stuff
RTA
FFT
ETC
RIR
Magnitude and Phase
Level and Freq
Dual-Trace Audio Oscilloscope
VU and Peak Meters
THD+N
Magnitude Audio Sweep
Phase Meter
Polarity
Distortion
Imp.
Imp. Plot
Delay Finder
STIPA Basic
STIPA Pro
Signal Generator


Etc, etc, etc.... It does so much I would need a pro here to list it so I could explain it all.

They are affiliated with AudioControl somehow because the module is sold on AudioControls site IIRC.

I can take screen captures if anyone is interested since I have most of the software unlocked.

That file is definitely around 0dB...

When you're Saving the Average Curve, in the little dialog that pops up, there's a little checkbox labeled "set for 0 dB at....". Uncheck that checkbox, then you should be good.

Hi Bill thanks.

1. I like the house curve slope adjustment.

2. The export biquads/eq notes the file content doesn’t make any sense?

3. I am not sure when the auto eq has finished, no notification/sign?

4. Another thing is that the measurenets are more stable, maybe i picked a better time? I was able to measure at level that wasn't annoying, 67dbspl. The problem i had was that there was no stability, i could turn up the level, no difference. What happened alot was that i could make a measurement, turn the test tone off, then turn back on and have a different result.


I measure the room, so i will play with those functions and post back.
Edited by Phillips751 - 7/11/12 at 12:43am

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Hi Bill attached is my EQ results.

In previous post i mentioned the Distance for the main speakers, your answer was to look at the Impulse. Please can you give me feedback with this.

Thank you
Edited by Phillips751 - 7/11/12 at 7:39pm

Bill, just wanted to thank you for the new software, especially the Zooming, smoothing, and multiple curves in the ETC plot. I use the omnimic exclusively as a tool for room improvement for 2 channel stereo listening. Ive been building absorption panels, QRD panels and bass traps to this end and I use the ETC prominently to help me establish my RFZ (reflective free zone). My targets is -15db up to 20ms. I am just about there. Being able to graph several ETC plots at once has made things much easier.

Thanks again.

Edit: Ive changed my ETC goals. Going towards a LEDE type room now with a termination gap at 10-12ms. Nice to have a tool like ETC so I can measure the changes and compare the measured responses to actual listening.
Edited by jim19611961 - 8/6/12 at 12:03pm

I have some average frequency response graphs captured with no smoothing. Is there anyway to display them with 1/6 smoothing after capturing them with none? I thought I'd done this before but can't figure it out now.

More enthusiasts need to recognize the signifigance of ETC,.... Now, wrt said upgrades, I need to explore those myself ... any added functionality is a good thing.

If you dont have test software and a mic, then thats one thing. But if you do, it would be a overt omission to not use the ETC.

Bill, do you have some enhancements in mind for the waterfalls and bass decays?

Please can someone confirm the right process for equalizing full range (20 - 20000 Hz?)

I understand not to over EQ.

What I have seen:

1. EQ both speakers combined (share the same filters)
2. EQ individual from 20 – 250 Hz then combined from 250 – 20000 Hz
3. EQ combined from 20 – 250 Hz then individual from 250 – 20000 Hz

Thank you

I just picked up an Omnimic to test some of the drivers I have at home to make sure they operate correctly. I don't need anything too accurate as a speaker designer might need, but just enough to make sure nothing is wrong with the drivers. I'm going to be measuring the following drivers and was looking for some input on what might be the fastest way to do this.

2 LMS 5400
16 Usher 8955A
7 Usher 8948A
7 ScanSpeak HDS

So drivers range from subs to tweeters and I was thinking of making a large panel that I could mount the drivers in an OB type configuration and compare the frequency responses and maybe distortion plots to see if they were close to the same. Can anyone tell me if this would work or there might be a better way?

Later, once I build my new speaker cabinets, I will measure the speakers again and give that information over to a friend of mine who does crossover work. At that time I will need to make accurate measurements, but I was hoping this project would allow me some time to get used to the mic/software.

Just ordered a OmniMic V2 from PE and have a quick question.

Has anybody ripped the test tone CD into itunes (lossless quality obviously) and then used a apple TV to play the tones back? Is this advisable and if it's been done where the results similar to using the CD directly?

should work fine. i havent done it with itunes, but plays fine from a usb stick. For response measurement, a 128k mp3 will work even.

Bill,

  Any news on the DVD?

I sent a partial demo to the folks at PE this week, for comments and suggestions. It's coming, just not as quickly as expected. I'm new to DVD production, so some learning curve is involved. The bluray version will have to be done by BR pros, that's a bit more than I can handle (other than the audio tracks).

Definitely looking forward to the BD version.

So there will be video, and on the DVD too?

Unless it's something like detailed tutorials, is it really worth the trouble?

It's to be able to direct individual test signals to each speaker in 5.1 and 7.1. The BR will also have same video test files in it.

Ah, so to be able to make menu selections I guess.

What benefit does BR have over DVD for simple test signals?

DVD doesn't support 7.1

Good reason

Just getting started with this system lol. Need help with interpertations. What does a "good" Frequence response, ETC, and RT60 graph/curve(s) look like? I'm trying to figure this out but I don't know lol.

I did read this whole thread this morning and it seems pretty much everyone is using the OmniMic to measure the response of their HT systems in room, mostly subs. However, I don't see any reports of people using it to measure drivers / speakers for crossover design. I'm in the midst of building a set of active speakers with a DSP on the 2 channel amp module. Is the OmniMic a good tool for measuring the driver's and speakers response and getting it all dialed in?