REW YouTube Tutorial - Page 3 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #21 of 93 Old 01-04-13, 01:00 PM
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Re: REW YouTube Tutorial


Hey Brian,

Unfortunately, the REW Downloads page – and the video - neglects to mention the need for a proper calibration file when taking measurements with the mic in an upright position.

It’s a well-known fact that the mic’s off-axis response is depressed in the upper frequencies compared to its on-axis response. For reference, see the graph below of measurements for a Dayton EMM-6 mic as performed by Herb Singleton of Cross Spectrum Labs. As you can see, when the mic is oriented 90-degrees of-axis from the signal source, its response at 20 kHz is a full 8 dB down.

Thus, room measurements taken with the mic upright, without the proper 90-degree calibration file, will show a droop in response above ~2 kHz that will not accurately reflect the speaker’s response or what the user actually hears. We've seen it happen here many times over the years, REW users perplexed about their poor measured response in the upper frequencies, only to find out that they weren't using the proper calibration file when they measured with the mic upright.


REW YouTube Tutorial-emm-6-off-axis-response.jpg
Dayton EMM-6 On and Off Axis Frequency Response
Courtesy of HiFi Zine
Regards,
Wayne



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post #22 of 93 Old 01-04-13, 02:17 PM
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Re: REW YouTube Tutorial

Above 2k i'm not too worried about. What we're trying to really tame is primarily below say 400Hz where the response is pretty much identical. If a 90 degree file is required, then it's something we should have on the site.

Bryan

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post #23 of 93 Old 08-07-13, 01:48 PM
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Re: REW YouTube Tutorial

Isn't the iso curve used by many professionnals supposed to decrease gently above 2K ?
This would mean that the given curve (as wayne highlighted) is near to what it should idealy be and poor measurements of the treebles doesn't mean that it simply doesn't exist or that you can't hear it.
A treeble uprising its power above 2k measured at 90 degrees would be dreadfull to hear and challenging to listen to more thant a few minutes.

After mesuring, when you start equalizing your room, feel free to push it up a bit just to have your own idea, it sometimes can make beautifull enhancements and sometimes can make everything sound really bad. It depends of the tweeter quality/softness/crisspiness. ;-)
Everything may sound good out of the ideal curve, just give it a try after you've reached it.

Ideally for me, I try to flattent the more I can to stick to the ideal curve and then I unleash it to different point from what I am hearing and what I wish to reach.

So reaching the ideal curve is simply where the real work begins for me.
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post #24 of 93 Old 08-07-13, 01:51 PM
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Re: REW YouTube Tutorial

I'd like to ask a question, when I understand that Room eq can allow to put cut frequencies for each speaker, can I consider this software as a full active filter ?
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post #25 of 93 Old 08-07-13, 08:35 PM
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Re: REW YouTube Tutorial

Quote:
bpape wrote: View Post
Above 2k i'm not too worried about. What we're trying to really tame is primarily below say 400Hz where the response is pretty much identical. If a 90 degree file is required, then it's something we should have on the site.
At 400 Hz and below the mic is omnidirectional, which makes upright orientation of the mic - and the proper calibration file - moot.


Quote:
tusoli5 wrote: View Post
...can I consider this software as a full active filter?
REW is a measurement program, not an equalizer program.

By the way, welcome to the Forum!

Regards,
Wayne



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post #26 of 93 Old 09-10-13, 02:57 PM
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Re: REW YouTube Tutorial

Great video, thanks for posting.. got my uMIK a couple months ago and my DSP1124 is on it's way.. now I just need to wrangle up the necessary cables and I'm off and running..
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post #27 of 93 Old 09-10-13, 03:04 PM
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Re: REW YouTube Tutorial

Great video, thanks for posting.. got my uMIK a couple months ago and my DSP1124 is on it's way.. now I just need to wrangle up the necessary cables and I'm off and running..
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post #28 of 93 Old 09-10-13, 08:49 PM
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I'm definitely going to check out this video, I'm curious as to how this all works and would like to try it out but not before understanding how to use it. From reading all the post above it sounds complicated.
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post #29 of 93 Old 09-12-13, 04:03 PM
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Re: REW YouTube Tutorial

pddufrene, I was right there with you.. I've been sitting on my uMIK for months now.. but, I've finally made moves to get started, got my DSP1124 today - my monoprice order of wires is coming in tomorrow.. so hopefully with some help from videos like these and the Shack/AVS forums I can get up & running in no time.. fingers x'd
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post #30 of 93 Old 09-12-13, 07:30 PM
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Quote:
dRwOOD73 wrote: View Post
pddufrene, I was right there with you.. I've been sitting on my uMIK for months now.. but, I've finally made moves to get started, got my DSP1124 today - my monoprice order of wires is coming in tomorrow.. so hopefully with some help from videos like these and the Shack/AVS forums I can get up & running in no time.. fingers x'd
I wish u luck, ill end up giving it a try once I figure out everything I need to get it going. Maybe by then you'll be able to coach me through it. Lol
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