Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 411 - AVS Forum
Forum Jump: 
 245Likes
Reply
 
Thread Tools
post #12301 of 12324 Old 11-26-2014, 08:11 PM
AVS Special Member
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 7,840
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 978 Post(s)
Liked: 884
Quote:
Originally Posted by aaranddeeman View Post
All righty..
Yes my AVR has Audyssey MultEQ XT
I will get to the next measurements tonight at some point.
Thank you for being patient with me.
Take your time. You should run the calibration before any more measurements. I assumed you have familiarized yourself with Audyssey best practices by reading the materials in the Audyssey thread. Following guidelines can make a difference between good and poor results.
AustinJerry is online now  
Sponsored Links
Advertisement
 
post #12302 of 12324 Old 11-26-2014, 09:04 PM
AVS Special Member
 
aaranddeeman's Avatar
 
Join Date: Jan 2005
Location: Lover's State
Posts: 1,412
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 129 Post(s)
Liked: 26
Quote:
Originally Posted by AustinJerry View Post
Take your time. You should run the calibration before any more measurements. I assumed you have familiarized yourself with Audyssey best practices by reading the materials in the Audyssey thread. Following guidelines can make a difference between good and poor results.
Oh. I already took the measurements. But anyways I can repeat both after calibration as well.
But check them out in the mean time.
Attached Thumbnails
Click image for larger version

Name:	left_sub_full_subrepos.jpg
Views:	36
Size:	202.8 KB
ID:	387481   Click image for larger version

Name:	right_sub_full_subrepos.jpg
Views:	33
Size:	197.7 KB
ID:	387489   Click image for larger version

Name:	center_sub_full_subrepos.jpg
Views:	35
Size:	199.9 KB
ID:	387497  
aaranddeeman is online now  
post #12303 of 12324 Old Yesterday, 06:20 AM
AVS Special Member
 
jkasanic's Avatar
 
Join Date: Dec 2006
Posts: 1,254
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 94 Post(s)
Liked: 73
Some pretty steep roll off above 6kHz?? What is the spec of your mains?

Just a tip on using REW, it's almost always better to take a full range measurement and restrict your graph limits when focusing on the bass region. This way when someone asks to see the full range, the measurement is already done. It wasn't clear from your post if that's what you did so disregard if that's the case.
jkasanic is offline  
post #12304 of 12324 Old Yesterday, 10:49 AM
Senior Member
 
TomC1315's Avatar
 
Join Date: Oct 2013
Location: North Royalton, Ohio
Posts: 238
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 39 Post(s)
Liked: 75
3 questions please ...

Do I need a laptop for REW, or can I use my Mac Mini ( I assume I can't use an iPad ) ?

I have the REW program, AudysseyXT, and the 2 PEQs on my PC13Ultra sub ... is there a preferred order involved ?

I have a Radio shack SPL meter ... should I invest in a better devise ?

Thank you :-)

MartinLogan Motion 40s / 30 / LX16s
Marantz SR5007 / UD5007
Emotiva XPA-3
SVS PC13ultra

exercise room: MartinLogan LX16s / Dynamo700
TomC1315 is offline  
post #12305 of 12324 Old Yesterday, 11:42 AM
AVS Special Member
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 7,840
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 978 Post(s)
Liked: 884
This thread is focused more on Windows devices, although several participants do use Mac's. You cannot use an iOS device. A SPL meter will provide crude measurements, but a USB mic is required for serious measurements. The REW guide has microphone recommendations. I don't understand your "preferred order" question.
TomC1315 likes this.
AustinJerry is online now  
post #12306 of 12324 Old Yesterday, 11:50 AM
AVS Special Member
 
LastButNotLeast's Avatar
 
Join Date: Feb 2007
Location: 08077
Posts: 4,776
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 265 Post(s)
Liked: 284
Quote:
Originally Posted by AustinJerry View Post
I don't understand your "preferred order" question.
Start with all eq off.
Play with your room, speaker placement, etc.
Then use the eq on the subs.
Then run Audyssey.
Repeat.
TomC1315 likes this.

Downloadable FREE demo discs:
http://www.avsforum.com/t/1475769/de...ently-authored 

Did you really need to quote that entire post in your reply?
LastButNotLeast is offline  
post #12307 of 12324 Old Yesterday, 12:15 PM
Advanced Member
 
3ll3d00d's Avatar
 
Join Date: Sep 2007
Location: London, UK
Posts: 613
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 270 Post(s)
Liked: 85
Quote:
Originally Posted by LastButNotLeast View Post
Start with all eq off.
Play with your room, speaker placement, etc.
Then use the eq on the subs.
Then run Audyssey.
Repeat.
You would use peq after audyssey if you want to apply a house curve. They are not mutually exclusive either, you can do before and after if you like. Typical reason to eq before is to take down a big peak which then enables audyssey to focus filter resources on fine tuning.
3ll3d00d is online now  
post #12308 of 12324 Old Yesterday, 12:52 PM
AVS Special Member
 
aaranddeeman's Avatar
 
Join Date: Jan 2005
Location: Lover's State
Posts: 1,412
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 129 Post(s)
Liked: 26
Thank you Jerry and others for your help.
Now I guess I have fair understanding of how REW works.
I can start playing with it more and more.
Oh and also need to get the USB mic... That should bring in accuracy in the measurements...
aaranddeeman is online now  
post #12309 of 12324 Old Yesterday, 12:56 PM
AVS Special Member
 
aaranddeeman's Avatar
 
Join Date: Jan 2005
Location: Lover's State
Posts: 1,412
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 129 Post(s)
Liked: 26
Quote:
Originally Posted by jkasanic View Post
Some pretty steep roll off above 6kHz?? What is the spec of your mains?

Just a tip on using REW, it's almost always better to take a full range measurement and restrict your graph limits when focusing on the bass region. This way when someone asks to see the full range, the measurement is already done. It wasn't clear from your post if that's what you did so disregard if that's the case.
My mains are JBL Northridge E80
Good TIP on full measurement. I will remember when doing next round.
aaranddeeman is online now  
post #12310 of 12324 Old Yesterday, 01:20 PM
Advanced Member
 
3ll3d00d's Avatar
 
Join Date: Sep 2007
Location: London, UK
Posts: 613
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 270 Post(s)
Liked: 85
Quote:
Originally Posted by aaranddeeman View Post
Good TIP on full measurement. I will remember when doing next round.
you're using an RS SPL meter atm aren't you? if so there is no point measuring beyond ~2kHz, the mic in the meter is not remotely accurate beyond that point. This explains the apparent drastic rolloff in your full range measurements btw, it's just the mic. Generally speaking the RS SPL meter is perfectly fine for general purpose sub work, it increasingly rolls off below 30Hz but the generally available cal files get it into the ballpark. As long as you don't try to use it to shape <30Hz then you'll be ok.

If you want to do full range measurements then a proper mic is the cost of entry.
3ll3d00d is online now  
post #12311 of 12324 Old Yesterday, 01:25 PM
AVS Special Member
 
jkasanic's Avatar
 
Join Date: Dec 2006
Posts: 1,254
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 94 Post(s)
Liked: 73
Quote:
Originally Posted by aaranddeeman View Post
My mains are JBL Northridge E80
Good TIP on full measurement. I will remember when doing next round.
Well, I'm not sure how to explain it then as those speakers are rated +/- 3dB up to 20kHz. Your tweeter crossover is 4kHz and it's a pretty smooth roll off. Looks a bit like destructive interference when you measure the left and right together. Your sure both speakers weren't playing during measurement?
jkasanic is offline  
post #12312 of 12324 Old Yesterday, 02:28 PM
AVS Special Member
 
aaranddeeman's Avatar
 
Join Date: Jan 2005
Location: Lover's State
Posts: 1,412
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 129 Post(s)
Liked: 26
Quote:
Originally Posted by jkasanic View Post
Well, I'm not sure how to explain it then as those speakers are rated +/- 3dB up to 20kHz. Your tweeter crossover is 4kHz and it's a pretty smooth roll off. Looks a bit like destructive interference when you measure the left and right together. Your sure both speakers weren't playing during measurement?
You mean both playing even though I wanted to measure Left only and Right only?
I will recheck that..

Edit : Not sure if we should blame RS-SPL meter. My another set of measurements show the exact same roll off after 6K.

Last edited by aaranddeeman; Yesterday at 02:31 PM.
aaranddeeman is online now  
post #12313 of 12324 Old Yesterday, 02:44 PM
AVS Special Member
 
jkasanic's Avatar
 
Join Date: Dec 2006
Posts: 1,254
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 94 Post(s)
Liked: 73
Quote:
Originally Posted by aaranddeeman View Post
You mean both playing even though I wanted to measure Left only and Right only?
I will recheck that..

Edit : Not sure if we should blame RS-SPL meter. My another set of measurements show the exact same roll off after 6K.
Yes, on the first part. Sorry, I didn't realize you were using an RS-SPL as your mic. That's probably the issue.
jkasanic is offline  
post #12314 of 12324 Old Yesterday, 03:17 PM
AVS Special Member
 
aaranddeeman's Avatar
 
Join Date: Jan 2005
Location: Lover's State
Posts: 1,412
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 129 Post(s)
Liked: 26
Quote:
Originally Posted by jkasanic View Post
Yes, on the first part. Sorry, I didn't realize you were using an RS-SPL as your mic. That's probably the issue.
Thanks. That's comforting...
I am trying to find the online retailer that has UMM-6 with 90 degree calibration available.
Can't seem to find it (I read somewhere @ AVS). Do you happen to have the link?
Really appreciate if you could post it.
aaranddeeman is online now  
post #12315 of 12324 Old Yesterday, 03:30 PM
AVS Special Member
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 7,840
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 978 Post(s)
Liked: 884
Shame on you! That information is in the Guide, which you should have memorized by now.

Linky: http://cross-spectrum.com/measuremen...ated_umik.html
AustinJerry is online now  
post #12316 of 12324 Old Yesterday, 04:02 PM
AVS Special Member
 
aaranddeeman's Avatar
 
Join Date: Jan 2005
Location: Lover's State
Posts: 1,412
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 129 Post(s)
Liked: 26
Quote:
Originally Posted by AustinJerry View Post
Shame on you! That information is in the Guide, which you should have memorized by now.

Linky: http://cross-spectrum.com/measuremen...ated_umik.html
Opps. This is what happens when you have "live" help available, you overlook the guide...
Thanks Jerry...

Edit : I was going to get UMM-6. or should I get UMIK-1. Which one is most favored?

Last edited by aaranddeeman; Yesterday at 04:08 PM.
aaranddeeman is online now  
post #12317 of 12324 Old Yesterday, 05:21 PM
AVS Special Member
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 7,840
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 978 Post(s)
Liked: 884
All explained in the Guide! Basically they are functionally equivalent.

BTW, you do know where the guide is, don't you?
AustinJerry is online now  
post #12318 of 12324 Old Yesterday, 05:46 PM
AVS Special Member
 
LastButNotLeast's Avatar
 
Join Date: Feb 2007
Location: 08077
Posts: 4,776
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 265 Post(s)
Liked: 284
Quote:
Originally Posted by AustinJerry View Post
BTW, you do know where the guide is, don't you?
Austin, TX
ambesolman likes this.

Downloadable FREE demo discs:
http://www.avsforum.com/t/1475769/de...ently-authored 

Did you really need to quote that entire post in your reply?
LastButNotLeast is offline  
post #12319 of 12324 Old Yesterday, 06:01 PM
AVS Special Member
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 7,840
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 978 Post(s)
Liked: 884
I used REW earlier today to tune the audio system in my new vehicle. Set up the USB mic and used a 3.5mm stereo cable to the AUX IN audio port on the car. I was able to find the optimal settings for an 8-band equalizer. Who said REW isn't a useful tool? I didn't bother installing any treatments though.
Greenwood Ave likes this.
AustinJerry is online now  
post #12320 of 12324 Old Yesterday, 07:10 PM
AVS Special Member
 
LastButNotLeast's Avatar
 
Join Date: Feb 2007
Location: 08077
Posts: 4,776
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 265 Post(s)
Liked: 284
Before and after graphs!!!!!

Downloadable FREE demo discs:
http://www.avsforum.com/t/1475769/de...ently-authored 

Did you really need to quote that entire post in your reply?
LastButNotLeast is offline  
post #12321 of 12324 Old Yesterday, 08:44 PM
AVS Special Member
 
aaranddeeman's Avatar
 
Join Date: Jan 2005
Location: Lover's State
Posts: 1,412
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 129 Post(s)
Liked: 26
Quote:
Originally Posted by AustinJerry View Post
I used REW earlier today to tune the audio system in my new vehicle. Set up the USB mic and used a 3.5mm stereo cable to the AUX IN audio port on the car. I was able to find the optimal settings for an 8-band equalizer. Who said REW isn't a useful tool? I didn't bother installing any treatments though.
Yeah. How about some "pink fluffy" dangling allover the inside of it..
aaranddeeman is online now  
post #12322 of 12324 Old Today, 07:27 AM
AVS Special Member
 
jkasanic's Avatar
 
Join Date: Dec 2006
Posts: 1,254
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 94 Post(s)
Liked: 73
Quote:
Originally Posted by aaranddeeman View Post
Yeah. How about some "pink fluffy" dangling allover the inside of it..
Who needs pink fluffy when you can literally make the "walls" disappear by rolling down the window or opening the sunroof!
jkasanic is offline  
post #12323 of 12324 Old Today, 09:22 AM
AVS Special Member
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 7,840
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 978 Post(s)
Liked: 884
No sunroof this time. It was the carbon fiber roof or a sunroof, and I chose the former. I add passengers to deaden the sound.
AustinJerry is online now  
post #12324 of 12324 Old Today, 11:15 AM
Member
 
Ratamacue's Avatar
 
Join Date: Jun 2012
Location: MN
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Liked: 10
Quote:
Originally Posted by AustinJerry View Post
No, you are correct. The guide should read 25 to 5 dB headroom. Thanks for pointing that out--I have made the correction.

As for whether you should get a new mic or not, keep in mind that many of us here use the USB mic with HDMI connections. This makes it easy to select channels in a 7.1 audio configuration. Since you have a two-channel audio system with a processor that doesn't support HDMI, I would say that your present kit is perfectly fine for your needs. You should be able to fully utilize the features of REW to analyze your system.
Ahh that makes sense, thanks for the clarification.

Yep my pre is strictly analog (my rig is Audirvana+ player with mini > ifi iDSD Micro dac > P7 > A21 amp > speakers), with the P7 also performing bass mgmt via its sub out. Speakers are full range and the subs are crossed at 50hz (in the P7). I'm plugging into an unused input on the P7 with RCA going to either the L or R chnl, with tone controls and all trims off.

I ran a ton of measurements and still not sure if I have the mic calibration "portion" correct as I reduced the mic volume level to 21 (in the Windows recording devices properties). I'm not sure if that has any adverse effect on the process. That level setting seemed to work since performing the mic calibration (SPL meter 80db at MLP, C weighted, slow, level 60-90) during the check level and actual measurements, I didn't receive any errors (headroom was fine, check level was -24 and max SPL said 105)

That being said, these are a few measurements
Attached Thumbnails
Click image for larger version

Name:	L+subs, xover 50, water.jpg
Views:	1
Size:	236.3 KB
ID:	389921   Click image for larger version

Name:	L+no subs, etc.jpg
Views:	0
Size:	168.1 KB
ID:	389929   Click image for larger version

Name:	L+no subs full range.jpg
Views:	1
Size:	122.1 KB
ID:	389937   Click image for larger version

Name:	R+no subs, full range.jpg
Views:	0
Size:	118.4 KB
ID:	389945   Click image for larger version

Name:	R+no subs, etc.jpg
Views:	1
Size:	159.1 KB
ID:	389953  

Click image for larger version

Name:	R+subs, xover 50, water.jpg
Views:	1
Size:	228.1 KB
ID:	389961  
Ratamacue is online now  
Reply Audio Theory, Setup, and Chat

Tags
Dayton , Dayton Audio , Room Equilizer Wizard Rew



Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off