Dayton OmniMic Precision Measurement System - Page 57

Recently got my omnimic back from PartsExpress with the new calibration. The process was quick and painless. Hopefully I'll have time today to play with it

1.  Ease of use and filter recommendations.

2.  Yes, yes.

I need a little guidance.

I have an recalibrated v1 omnimic. I just downloaded REW again. I'd like to import my FRD from omnimic into REW and have it automatically calculate the filters I need. I'm just wanting to play a little bit.

I can import the frd file into REW and it shows up, but I can't figure out how to automatically calculate the filters from that point?

Can anybody assist?


I'm heading over to KCNitro07's house today and we are going to play with his DIY titanic MK3 drivers in sealed cabs with the Inuke DSP3000 amp, and then I'm borrowing a Behringer DCX2496 from counsil and would like to use it to customize my subwoofer EQ. I can do all this manually with the omnimic and playing around, but wanted to toy with the automated calcuation as well. I saw the automated calculation in process at the huskeromaha meet and it was amazingly efficient, but I don't recall how desertdome got it to calculate.
Edited by Archaea - 6/30/12 at 11:24am

This thread isnt really going anywhere, i don't know where everyone has gone, maybe to another forum?

It would pay to look at the REW help files, as soon as you have already worked out how to import the file.

Basically
Click on the EQ tab then change the Equaliser (top right) to the eq you intend to use then follow the rest of the tab settings.
It can also be done manually or tweak after automatically settings.
Keep in mind that you can't use the waterfall in REW when the FRD has been imported.

Hope this helps a little.

Yes, thank you for the response! desertdome gave me the quick and dirty yesterday too and I did get it working......

However. For some reason it doesn't seem to manage the low end to flat on the setup I tried yesterday. I told it I'd like it flat between 20hz and 100hz +/-3dB and it did it near perfectly between 30hz and 100hz with three Parametric EQs which I plugged into the DSP. The results were phenominal to 30hz, but from 30hz to 20hz there is still a 10dB drop and the lowest EQ filter REW advised me on was a 29hz filter (which was a cut). I did tell it no more than a 3dB boost, but it didn't give me any boost at all. I told it 6dB boost max and nothing changed. Couldn't the EQ just cut the rest of the sealed peak down further to make it flat to 20hz? I'm not sure how to make it do that. BTW it was already cutting 10dB off around 50-60-70hz at this point. Not sure if it has maximum cuts it will recommend too. This maybe the wrong thread to post in at this point because it's more a REW question, but I'm here, so figured it's worth the ask. The automatic EQ generator funtion in REW is pretty darn cool none the less.

Your question is more related to REW than Omnimic. You're more likely get a correct answer in their forum. We can't post other forum names here but google REW forum and you should be able to find it.

I'm sure it's in this thread but I can't find it so I'll just ask. When measuring frequency response of your speakers do you point the mic at each speaker individually or just forward to the middle of the room?

you should do each speaker individually.

Place the mic pointing down the middle, at your listening position (where your head would be while listening).

Have it flat with the tip facing the speakers. I have it tilt a little upwards.

Measure each speaker individually then combined.

Omnimic is great for finding the best placement for speakers subs, due to its real time analysis.

So don't aim it directly at the speaker?

it doesnt matter a lot except at the higher frequencies. It's a very small tip omni microphone.

So if I'm pointing the mic forward to the middle of the room for the front 3 speakers do I leave it there for the surrounds or should I point it to the back of the room?

I leave it in the same position for all speakers.

I wonder if there are any updates for the software shortly?

Yes I've been really looking forward to the 5.1 addition for quite some time. Any possibility of a projected release date on that Bill?

Do you guys use all or blended when taking measurements?

Blended (default setting)

Yeah, an update is imminent.

 

The 5.1 disk is lagging behind, sorry, I'm the one who's late on that, not PE.

Hi Bill

1. Any hints on the update content and release date?

2. Does the Omnimic have a soundcard built into the mic?

3. To EQ main speakers, is it best to EQ combined vs individual vs individual from 125hz up them 125hz down combined?
Edited by Phillips751 - 7/5/12 at 1:47pm

Haven't read through the thread (sorry =P ) but has anyone tried the Studio Six Digital iAudioInterface2 + software for the iPhone/iPad? I have purchased most of the software and just need to get a mic and the interface. I'm curious how these two would stack up against each other?

Pre-official-download of the new version of Omnimic software. I'll be doing a short talk on this at the MWAF next Saturday.

http://www.libinst.com/Omnimic/OmniMicInstall.exe

--
Features in this version:

• Automatic (or manual) equalization parameter export to MiniDSP, can work on average responses at multiple seating positions.
• Built-in Z-Axis offset calculator for determining depth differences between tweeters and midranges, allows accurate crossover design.
• text notes can be added onto Snapshot files for publishing online
• Speech Transmission Index (STI) and RASTI calculated in the Energy Time Curve display.
• Dual tone sine/square wave generator for computer soundcard
• Zooming, smoothing, and multiple curves in the ETC plot.
• Can download microphone calibration files directly from the web.
• Longer time lengths supported in waterfalls and Wavelet spectrograms for room analysis
• 690msec WAV file export for impulse responses
• Phase display in Added Curves
• Easy curve splicing (such as joining tweeter and woofer curves) for display
• New math function for main curve: vector sum with data from saved FRD files, with delay adjustment
• Compatible with V1 or V2 hardware

Sweet! So should I wait for an "official" listing or is this one worth getting right now?

Not likely to be different, unless some major bug pops up.

Okay, good to know. And I am assuming this new update still lacks the 5.1 testing that has been mentioned.

5.1 will be a dvd disk source, not the measurement software. Just something to direct sounds toward each speaker.

Might be a blu-ray, I hear now (and 7.1?), but someone has to figure out what's involved in producing blu-ray disks for video players.

Oh...I see. I wasn't sure if they would have been downloadable content. I would LOVE 7.1 test tones. I've been running 6.1 since 2000 and 7.1 for about 4-5 years.

Thanks Bill

I have tried the Align two speakers in "time of arrival" at a listening position

Arrange your system so that the Test Track sound plays out of both speakers you are working with, but with any other speakers silent. Choose the Frequency Response page and play the indicated track with the microphone set at the desired position. Set the control that is near the top to "blended" and observe the Impulse Response display. If there is a time of arrival difference between the two speakers, you should be able to see two impulse peaks. The one to the left (near the 0 msec point) is from the speaker with the earlier delay time, the other is for the later one. If you have an electronic delay unit, adjust the delay applied for the earlier speaker so the peaks become superimposed. If you have more than two speakers you wish to align together, choose the latest (the one making the right-most peak) to be the reference and delay the others to align to its peak.


I impulse looks different to what the diagram looks like in the manual.

The two peaks don't look as clear / standout.

Please can you advise / try some possibilties?

Also does the EQ apply to any equalizer or just the MiniDSP?

different speakers have different impulse responses, impulse response being another way of presenting frequency response. You'll need to look at the individusl ir of your speaker to see what 1 looks like. Some speakers don"t have clear impulse responses, such as many omnidirectional designs (bose 901 and such or nxt) and basically cant be aligned in time.

Thanks, Bill! Especially for the new ETC functions.

Awesome, Bill!

And I thought you were spending all your time on the SEOS speakers

Hi Bill have i missed something, i am trying to save measurements then make Eq adjustments later.

I have tried several ways but the only time i can eq is when the measuremetns are live.

Please can you give steps to do this, if possible

Thank you