Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 500 - AVS | Home Theater Discussions And Reviews
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post #14971 of 14986 Unread Yesterday, 07:08 PM
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Quote:
Originally Posted by AustinJerry View Post
I am not obsessing about what is a minor dip.
I have a similar issue in my room. Adding PEQ bost is not very helpful and actually based on the GD not getting better I am not sure I want more SPL in that FR arriving at the wrong time anyway! In my set up Dirac and choosing lower slope XO made a huge difference in IR and GD for the vast majority the the frequency range. Overall I think fixing the FR by actually fixing the time domain is the best approach. Trying to force FR with boost where you have poor GD values does not seem to help in the cases I have tried, and in fact the filter itself seems to create more delay problems. I guess this is the bread and butter for multiphase correction, knowing where to fix and where to leave alone. Now passive room treatments or active bass trapping would be another story!

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post #14972 of 14986 Unread Yesterday, 07:18 PM
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Quote:
Originally Posted by lbrown105 View Post
choosing lower slope XO made a huge difference in IR and GD for the vast majority the the frequency range.
If this works for others, this would be a great tip.

Did you really need to quote that entire post in your reply?
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post #14973 of 14986 Unread Yesterday, 07:25 PM
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Duplicate from HTS in case anyone doesn't read over there:

I went thru the "Getting Started With REW PDF" line by line for HDMI, and when I get to the point to calibrate the SPL meter I get an Asio driver error. Attaching pics to try and help.

Dell XPS Laptop
Win 8.1 Pro 64 bit
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USB to Umik 1 from Cross Spectrum
Asio 2.12


















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post #14974 of 14986 Unread Yesterday, 07:34 PM
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You can skip that part entirely for a UMIK-1. I did the same thing and realized it was unnecessary. It tells you later in the guide - I'd suggest moving that up in the guide so people don't waste their time.
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post #14975 of 14986 Unread Yesterday, 07:35 PM
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Just as a note...not happy that the new version of REW wants me to uninstall the program first, which means I'll have to set it up again. Bah!
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post #14976 of 14986 Unread Yesterday, 07:45 PM
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Quote:
Originally Posted by Soulburner View Post
I started doing this after reading your comments on it recently. It does drop your measurement SPL. For example, if I put the windows mic volume at 100 and my AVR at -20 and get 90db readings, then put the mic volume down to 30 and measure 60db, my system is still putting out the same SPL as before, I just made the mic less sensitive to it.
I have a -12db Umik and my measured output levels are exactly the same with same MV level whether mic volume is set to 100 or 10. Both graph overlays each other. IIRC, Jerry's guide has a section on the measured outputs with vary mic volume settings for both of the Umik and UMM. The umik is more accurate with different mic level settings.
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post #14977 of 14986 Unread Yesterday, 07:53 PM
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Quote:
Originally Posted by tvuong View Post
I have a -12db Umik and my measured output levels are exactly the same with same MV level whether mic volume is set to 100 or 10. Both graph overlays each other. IIRC, Jerry's guide has a section on the measured outputs with vary mic volume settings for both of the Umik and UMM. The umik is more accurate with different mic level settings.
That's odd, I thought I got lower readings. Let me check when I get home from work to make sure I didn't change more than one setting at once. It's possible I'm attributing what I saw to the wrong cause.
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post #14978 of 14986 Unread Yesterday, 07:53 PM
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Gadget like soul said skip past the calibrate SPL meter part.
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post #14979 of 14986 Unread Yesterday, 09:22 PM
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Quote:
Originally Posted by gadgtfreek View Post




Might want to check the bit depths of your mic and playback devices are the same.

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post #14980 of 14986 Unread Yesterday, 11:01 PM
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Quote:
Originally Posted by lbrown105 View Post
choosing lower slope XO
This also extends the passband for the speaker/sub which can be a v bad thing.
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post #14981 of 14986 Unread Yesterday, 11:17 PM
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Quote:
Originally Posted by lovingdvd View Post
I got my UMIK-1 on Friday and indeed it is set to -18dB. What is the advantage of this (why do you think they started shipping them this way instead of at -12dB)? And what are the implications of this when it comes to REW? Is this why I do not seem to be able to measure too high without clipping? I want to measure at a high SPL so I can see at what point distortion starts to pick up. How can I do this when it wants to clip around 80-some dB?
80dBSPL doesn't make the mic clip. You're probably overdriving an input somewhere. Check all input settings, read the guide, read the REW help.

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post #14982 of 14986 Unread Today, 04:47 AM
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Originally Posted by steveting99 View Post
Might want to check the bit depths of your mic and playback devices are the same.
I tried 24 bit studio quality for the other, still crashed.

It's funny, after it crashes I can hit the little red button again after closing the Asio popup and the SPL meter starts reading sound from the umik, just no sound to speakers. I will skip.

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post #14983 of 14986 Unread Today, 04:55 AM
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OK, I see it now. Tonight Ill get the sensitivity file for my Umik-1 and then move on with the setup process.

Panasonic 65" VT50 / BDP-S6500
Marantz AV7702 / Outlaw Model 7500
Klipsch RF7II (2) and RC64II / Hsu VTF-15H (2)
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post #14984 of 14986 Unread Today, 05:28 AM
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Quote:
Originally Posted by gadgtfreek View Post
I tried 24 bit studio quality for the other, still crashed.

It's funny, after it crashes I can hit the little red button again after closing the Asio popup and the SPL meter starts reading sound from the umik, just no sound to speakers. I will skip.
This is the case for me too. My AVR is showing as 16 bit DVD Quality 48000 and mic is showing as 24 bit Studio Quality 48000. Guys is it okay to set both to 24 bit Studio Quality 48000, so that they match or does this really not matter as long as both show 48000hz? Also, when I run a sweep it shows my headroom as like 39db. This doesn't seem correct.

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Last edited by JT78681; Today at 05:41 AM.
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post #14985 of 14986 Unread Today, 05:31 AM
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Looking at the guide, I think 48,000 matching is all that matters.

Panasonic 65" VT50 / BDP-S6500
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Klipsch RF7II (2) and RC64II / Hsu VTF-15H (2)
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post #14986 of 14986 Unread Today, 05:52 AM
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Quote:
Originally Posted by LastButNotLeast View Post
If this works for others, this would be a great tip.
each order contributes 90 degrees of phase rotation and GD is the derivative of phase response therefore, by definition, changing the order of the slope will change group delay. This is not a good reason in itself to use lower order slopes. This is a good overview - http://www.rane.com/note160.html
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