Dayton OmniMic Precision Measurement System - Page 72 - AVS Forum | Home Theater Discussions And Reviews
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post #2131 of 2136 Old 07-04-2015, 04:43 AM
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Thank you.
So to do compression sweeps to measure the limit of my subwoofers, I have to keep raising the volume while letting the sine sweep repeat to build the averages? That wouldn't be a good idea at higher volumes.. Is there a way to do it with one sweep?
Also can the omnimic be used with rew?
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Originally Posted by primetimeguy View Post
The sweep should keep repeating so you should see a constant plot, but more than likely shifting slightly. Hit the pause button in the top left to pause the measurement. then you can save, print or do whatever you'd like with it.
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post #2132 of 2136 Old 07-04-2015, 07:00 AM
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Quote:
Originally Posted by ahmedreda View Post
Thank you.
So to do compression sweeps to measure the limit of my subwoofers, I have to keep raising the volume while letting the sine sweep repeat to build the averages? That wouldn't be a good idea at higher volumes.. Is there a way to do it with one sweep?
Also can the omnimic be used with rew?
End result when overlaid should look like this.


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post #2133 of 2136 Old 07-31-2015, 07:26 PM
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What's the minimum SPL that Omnimic V2 will measure? Does it go low enough <25 db to measure the noise floor in a hightly treated theater?
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post #2134 of 2136 Old Yesterday, 09:53 AM
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I have seen level of around 18 db's in my room.
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post #2135 of 2136 Old Yesterday, 08:14 PM
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Another question.

To check how flat a sub is and where the 3 db drop off is, how do you measure with Omnimic.

I'm assuming I use the requency response tab and play pseudo noise. Is this correct?

Also, what's the best way to ONLY test the sub, and not the rest of the speakers?
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post #2136 of 2136 Old Today, 09:37 AM
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Yes, use the Frequency tab to look at the sub and room response. The stated 3 db point is not much use in the HT. To measure just the sub, a mic can be put around 6 in. in front of the sub/s. This will minimize the room influence. I don't worry about that and just measure the sub/s and mains at the MLP. This way I can see how well they are playing together and look at the XO point. Use 1/6 or 1/12 smoothing and scale the graph 20 Hz to 200 Hz.

I don't worry much about anything above the XO since autocalibration is taking care of that. For vented subs the 3 db point is Ok but for sealed I also look at the -10 db point. Additional DSP, PEQ, and a way to make adjustment is needed. The I Nuke DSP amps or MiniDSP are good for this.
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