Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 742 - AVS Forum | Home Theater Discussions And Reviews
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post #22231 of 23569 Old 04-04-2017, 06:49 PM
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Originally Posted by LastButNotLeast View Post
That is the full range of an mbm. So a high cut at 70Hz would give you a boost from 40 - 70, which is what you need.
Michael
I tried that at the time but it didn't work out. I'll need to regroup and replan. Or I may have done it incorrectly.

Next time will be better! Yes!

Actually, looking at this frequency chart maybe I don't need to worry about anything below 60Hz for music. Only thing down there are some piano keys. I am not a piano lover, strings are my thing.

Movies might need support down there but that's a hopeless cause for me. I mustn't get anything bigger than a 12" subwoofer. Mustn't!

Last edited by artur9; 04-04-2017 at 07:42 PM.
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post #22232 of 23569 Old 04-04-2017, 08:07 PM
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Originally Posted by gwsat View Post
I got the same mic that Cross-Spectrum sells for $100.00 from an Amazon partner for $95.00. Then, I downloaded a link to a site that provides free calibration files for the mic that are supposed to work well. Thanks to LastButNotLeast for the tip.
You're welcome.
In case you're losing sleep over it in the meantime, this is a test I ran using my mic and the calibration files for it:
Musical Sub-Woofage Needed!
There may be more of a difference at the high end (>10KHz), but my ears probably cut off long before the mic does.
Michael
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post #22233 of 23569 Old 04-04-2017, 08:18 PM
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Originally Posted by artur9 View Post
Actually, looking at this frequency chart maybe I don't need to worry about anything below 60Hz for music.
This chart's more fun:
http://www.independentrecording.net/...in_display.htm
The chart you're looking at calls "Bottom" 60 - 80Hz, but shows the 5-string bass going down to 30Hz. You will miss A LOT if you stop at 60Hz.
Notice also the "Ear Sensitivity" chart on the right, which shows you need more volume as the notes get lower to hear them.
You may not be interested in the 16Hz "Organ" Symphony #3 of Saint-Saens, or my latest Pandora discovery, Instrumental Chillstep, but there are plenty of low notes in what you're listening to now.
So worry about it!

Michael
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post #22234 of 23569 Old 04-05-2017, 04:55 AM
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Originally Posted by LastButNotLeast View Post
This chart's more fun:
So worry about it!

Michael
Michael, I think you're conspiring against my wallet and my marital bliss.
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post #22235 of 23569 Old 04-05-2017, 06:21 AM
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Nope, just your wallet.

Michael

Did you really need to quote that entire post in your reply?
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post #22236 of 23569 Old 04-05-2017, 06:40 AM
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Quote:
Originally Posted by LastButNotLeast View Post
You're welcome.
In case you're losing sleep over it in the meantime, this is a test I ran using my mic and the calibration files for it:
Musical Sub-Woofage Needed!
There may be more of a difference at the high end (>10KHz), but my ears probably cut off long before the mic does.
Michael
Michael — Thanks for the link. Your graphs lead me to strongly suspect that mic calibration is a pretty insignificant factor in configuring a sub.

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post #22237 of 23569 Old 04-05-2017, 09:02 PM
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I think i found something that i can be happy with now with my four subs. i thought i'd tweak my four subs a bit tonight. a big improvement in bass. still a bit clipping in the front amp but not too horrible. past 80hz is good from my last measurement of that minus a dip at i think 160.
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post #22238 of 23569 Old 04-05-2017, 09:07 PM
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Here is my small ported 18" ultimax sub. can't believe i got it to look like this. it's the about the same size as the power sound audio V1800.
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post #22239 of 23569 Old 04-07-2017, 06:10 AM
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Originally Posted by WormInfested View Post
I think i found something that i can be happy with now with my four subs. i thought i'd tweak my four subs a bit tonight. a big improvement in bass. still a bit clipping in the front amp but not too horrible. past 80hz is good from my last measurement of that minus a dip at i think 160.
Nice progress. Having said that, it would be more meaningful here to present the measurements in a format that we are more used to, and which does a better job of revealing actual performance. Here are a few recommendations:

Present two measurements, one showing the combined subs-only response, and the second showing subs+center. The latter will show how well the subs integrate with the mains.

Show measurements 15-300Hz, which will include the crossover region, an important area to observe when it comes to sub performance. And state what the crossover value is.

Finally, configure the vertical scale as a smaller range, say 50-100dB. The wider the range, the flatter the graph will look. What is really important is whether the peaks and dips are within a +/- 5dB range, considered by many to be a reasonably acceptable deviation. And configure the measurements with no smoothing.
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post #22240 of 23569 Old 04-07-2017, 06:52 AM
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Really looking forward to getting my UMIK-1 mic and getting started with REW. I haven't decided on which new sub(s) to buy yet so will practice on my ancient Hsu VTF-3 MK3 Turbo. FedEx says that the mic left Olathe, KS at midnight, so my chances of receiving it by Monday look good. REW has been downloaded and is ready to go. Should I also download and install REW V5.19 beta 4?
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post #22241 of 23569 Old 04-07-2017, 06:57 AM
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Originally Posted by gwsat View Post
Really looking forward to getting my UMIK-1 mic and getting started with REW. I haven't decided on which new sub(s) to buy yet so will practice on my ancient Hsu VTF-3 MK3 Turbo. FedEx says that the mic left Olathe, KS at midnight, so my chances of receiving it by Monday look good. REW has been downloaded and is ready to go. Should I also download and install REW V5.19 beta 4?
Typically, you should install the current beta from here:

http://http://www.roomeqwizard.com/beta.html

Last edited by AustinJerry; 04-07-2017 at 07:34 AM.
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post #22242 of 23569 Old 04-07-2017, 07:23 AM
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Typically, you should install the current beta from here: http://http://www.roomeqwizard.com/beta.html
Your link didn't work. I was asked if I wanted to download the latest beta from the REW app itself. Would there be anything wrong with getting the beta that way? Anyway, I think the beta the app asked me about is the same one you told me about because both seem to come from the REW site.

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post #22243 of 23569 Old 04-07-2017, 07:36 AM
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Originally Posted by gwsat View Post
Your link didn't work. I was asked if I wanted to download the latest beta from the REW app itself. Would there be anything wrong with getting the beta that way? Anyway, I think the beta the app asked me about is the same one you told me about because both seem to come from the REW site.
Try the link again. For some reason, there were two "http://" in the link. Also, the link is on page 28 of the Guide.
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post #22244 of 23569 Old 04-07-2017, 08:29 AM
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Try the link again. For some reason, there were two "http://" in the link. Also, the link is on page 28 of the Guide.
Is there any reason I simply couldn't use the Link for the beta that the REW app itself asks if I want to use? That seems way more straightforward, unless there is a reason I shouldn't use it.

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post #22245 of 23569 Old 04-07-2017, 08:37 AM
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Is there any reason I simply couldn't use the Link for the beta that the REW app itself asks if I want to use? That seems way more straightforward, unless there is a reason I shouldn't use it.
I don't understand your concern. If there are two links that point to the same software version, why would it make a difference which one you would use? The link I provided is the link normally provided by JohnM, the author of REW.
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post #22246 of 23569 Old 04-07-2017, 08:59 AM
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My miniDSP UMIK-1 is out for delivery today, but the mic stand wont get here until next Tuesday

Also got some XO parts for my new B&W replacement drivers.
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post #22247 of 23569 Old 04-07-2017, 09:12 AM
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Originally Posted by gwsat View Post
Is there any reason I simply couldn't use the Link for the beta that the REW app itself asks if I want to use? That seems way more straightforward, unless there is a reason I shouldn't use it.
That's what I do, when you open REW under the Help tab I have "check for updates on start up"
if there's an update available I just click on that and it will replace your current version after download, no further action required, hope that helps. You can also check if the current version is up to date under the Help tab as well.
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post #22248 of 23569 Old 04-07-2017, 09:39 AM
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I don't understand your concern. If there are two links that point to the same software version, why would it make a difference which one you would use? The link I provided is the link normally provided by JohnM, the author of REW.
you've told me what I need to know: I can use either link. Thanks!

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post #22249 of 23569 Old 04-07-2017, 10:04 AM
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@markus ,

Markus what's considered a near field (distance) setup for subs, I'd like to understand how this relates to "remove the room from the low frequency response....? Thanks.
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post #22250 of 23569 Old 04-07-2017, 10:26 AM
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you've told me what I need to know: I can use either link. Thanks!
gwast, when updating to the newest beta version when you open REW, hit update and close the current version for the new update to complete, the prompts will navigate the options. You probably already know this but I thought I would include it anyway for someone who doesn't.
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post #22251 of 23569 Old 04-07-2017, 11:00 AM
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gwast, when updating to the newest beta version when you open REW, hit update and close the current version for the new update to complete, the prompts will navigate the options. You probably already know this but I thought I would include it anyway for someone who doesn't.
Thanks for the tip! Indeed, I hadn't thought of the necessity to close the app before installing its latest beta update. Anyway, it's all done now. Thanks for the help.

Can hardly wait to get my UMIK-1, open REW, and see how my Yamaha 3060 handles EQ. It's times like this when I really appreciate what a resource you and other knowledgeable AVS posters are.

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post #22252 of 23569 Old 04-07-2017, 12:17 PM
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Thanks for the tip! Indeed, I hadn't thought of the necessity to close the app before installing its latest beta update. Anyway, it's all done now. Thanks for the help.

Can hardly wait to get my UMIK-1, open REW, and see how my Yamaha 3060 handles EQ. It's times like this when I really appreciate what a resource you and other knowledgeable AVS posters are.
You're quite welcome, just follow Jerry's guide, I would suggest you read through as much of it as possible prior to getting the UMIK-1 and mic stand (a necessity), this will keep your questions to a minimum as most every question will be answered in the guide. The trouble shooting section is an invaluable tool with reference to most common encountered setup problems, once you're up and running the fun begins and a lot of the intimidation feelings seem to dissipate. Good luck and look forward to seeing your results.

Cheers Jeffrey
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post #22253 of 23569 Old 04-07-2017, 12:37 PM
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You can certainly play with it now without the stand, just don't expect the results to be extremely accurate.
Get comfortable taking measurements and playing with the resultant graphs.
That way you will waste less time once the stand arrives.
Michael
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You can certainly play with it now without the stand, just don't expect the results to be extremely accurate.
Get comfortable taking measurements and playing with the resultant graphs.
That way you will waste less time once the stand arrives.
Michael
Hey Michael, how can he play with it since he doesn't have it yet, he's hoping for Monday maybe? Also I wanted to ask you how can the miniDSP calibration files be used with a mic calibrated by Herb at CSL, just curious. Is it the fact that he didn't get the thumb drive with the cal files on them, or it's not much of a difference from what the miiniDSP numbers are? So the Sens factor would work with either calibration be it miniDSP or CSL?
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post #22255 of 23569 Old 04-07-2017, 02:47 PM
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It's certainly possible to play with REW with any of the mdat files that have been posted here.
Obviously, he'll have more fun once he gets the mic, even without the stand.
A calibration file is a calibration file. Pick one (the one you hope is more accurate) and use it.
I've been told of a Chinese proverb (probably from a fortune cookie somewhere): With one watch, you know what time it is. With two, you can't be sure.
With or without one of the calibration files, results will be good enough for most purposes.
Without a sens factor, you have to match the SPL meter in REW to a physical SPL meter, as outlined in The Guide. Without the sens factor, though, you still get accurate RELATIVE results.
As I understand it.
Corrections to anything wrong will no doubt appear momentarily.

Michael
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post #22256 of 23569 Old 04-07-2017, 05:07 PM
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Quote:
Originally Posted by LastButNotLeast View Post
It's certainly possible to play with REW with any of the mdat files that have been posted here.
Obviously, he'll have more fun once he gets the mic, even without the stand.
A calibration file is a calibration file. Pick one (the one you hope is more accurate) and use it.
I've been told of a Chinese proverb (probably from a fortune cookie somewhere): With one watch, you know what time it is. With two, you can't be sure.
With or without one of the calibration files, results will be good enough for most purposes.
Without a sens factor, you have to match the SPL meter in REW to a physical SPL meter, as outlined in The Guide. Without the sens factor, though, you still get accurate RELATIVE results.
As I understand it.
Corrections to anything wrong will no doubt appear momentarily.

Michael
Very good my friend, I enjoy your comments, makes for good entertainment especially when this thread goes way above my level of understanding which by the way is not too high...My rational is he's very unfamiliar with REW and you say to play around with mdats that have been posted, interesting. I think I read that same fortune cookie proverb and I just pick the time in between the two watches...

If this was me I'd use the cal file and sens factor of the serial number from the miniDSP site and call it a day. You'll get no corrections from me on this one, I'll leave that to the masses. As for the RELATIVE results, I'll leave that one alone...........
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post #22257 of 23569 Old 04-07-2017, 06:38 PM
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Very good my friend, I enjoy your comments, makes for good entertainment especially when this thread goes way above my level of understanding which by the way is not too high...My rational is he's very unfamiliar with REW and you say to play around with mdats that have been posted, interesting. I think I read that same fortune cookie proverb and I just pick the time in between the two watches...

If this was me I'd use the cal file and sens factor of the serial number from the miniDSP site and call it a day. You'll get no corrections from me on this one, I'll leave that to the masses. As for the RELATIVE results, I'll leave that one alone...........
Saying that I am “very unfamiliar with REW” gives me far too much credit. I have downloaded and installed the latest REW beta, and found the app’s signal generator and SPL meter but that’s about it. I will take your advice and use the calibration file for my specific mic. What is the “sens factor” for my mic? Once I get the calibration file and learn what to do with the “sens factor” I will indeed “call it a day.” As for the rest of the stuff you mention, as of this moment, You might as well be posting in Sanskrit. I will do better, though.
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post #22258 of 23569 Old 04-07-2017, 07:22 PM
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Just read through The Guide and follow it through. The sens factor comes with the calibration file.
One step at a time. That's how we all started. Some of us run faster than others, but we all started the same way.
Some of us even before the outstanding Guide was put together. And we're all still learning (even Jerry, who continues to update the Guide as he learns more).
Welcome aboard.
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post #22259 of 23569 Old 04-08-2017, 12:21 AM
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Quote:
Originally Posted by ahblaza View Post
@markus ,

Markus what's considered a near field (distance) setup for subs, I'd like to understand how this relates to "remove the room from the low frequency response....? Thanks.
https://mehlau.net/audio/dual_nearfield_sub/
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post #22260 of 23569 Old 04-08-2017, 03:57 AM
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Here's some measurements showing why having a sub close to the couch is in no way to be considered "near field".
Dipole sub measured at 0cm, 30cm, 60cm, 90cm, 120cm (0ft, 1ft, 2ft, 3ft, 4ft) – even at only 2ft distance the response is already swamped by the room response:

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