Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 693 - AVS Forum | Home Theater Discussions And Reviews

Forum Jump: 
 1621Likes
Reply
 
Thread Tools
post #20761 of 20778 Old 11-27-2016, 01:21 PM
AVS Addicted Member
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 14,217
Mentioned: 142 Post(s)
Tagged: 1 Thread(s)
Quoted: 5890 Post(s)
Liked: 3307
Quote:
Originally Posted by FargateOne View Post
Thank you Austin.
I was not sure about how to cure the uneven frequency response and you confirm that more treatment is not the best way.

About Dirac Live, I have nanoAvr-DL (you know...bass management after EQing thing...supposed to be bad!). I tried only a couple of time Dirac for my 2 front mains only (stereo, no sub, speakers set to large in the receiver) and , until now, I am not happy with the auto target curve. I know the procedure using text files to create my own target with DL but I do not know what to change to get better sound. I tried to make some changes somewhere on the curve but doing worst than no EQ at all. ( low fr coming boomy, lost details in higher fr, shift in sound stage image etc) . Without guidance it is a long process of trial and error.

On the other hand, I must say that Dirac Live works very very well for my 5.1 setup for movies: the best sound I ever had particularly since I've reduced dratically the reflections with bass traps.

BTW, thank you again for your REW step-by-step guide!
I agree that the Dirac implementation in the NanoAVR is flawed. Have you considered switching to the 88A?

If you want to develop a custom curve, you might find the guide linked in my sig useful.
AustinJerry is online now  
Sponsored Links
Advertisement
 
post #20762 of 20778 Old 11-28-2016, 06:58 PM
Member
 
MBrown2020's Avatar
 
Join Date: Aug 2013
Location: Wisconsin
Posts: 15
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Liked: 10
I did some measurements moving the center channel at diff distances from wall. My range is min 15" from face of speaker to wall and max 42" from wall. Looks like 21" looked best?

mdat:https://www.dropbox.com/s/q4274wo3a7...eaks.mdat?dl=0


I also did some the sub tweak. Audyssey default was 15.5ft for both subs. I did measurements at 14.5-8.5 and 16.5-23.5. The three best ones look like 1=22.5 2=20.5 3=11.5. What do you think and did I do it right?

mdat: https://www.dropbox.com/s/1a8pjz11is...weak.mdat?dl=0
Thanks!
MBrown2020 is online now  
post #20763 of 20778 Old 11-28-2016, 07:51 PM
Member
 
Join Date: Feb 2015
Posts: 79
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 34 Post(s)
Liked: 1
Quote:
Originally Posted by AustinJerry View Post
I agree that the Dirac implementation in the NanoAVR is flawed.
I know it is not the thread for this, but I think that the flaws in NanoAvr-DL are much less a problem in room of smal dimensions like mine (3 500 cubefeet more or less) than in larger room.

Quote:
Have you considered switching to the 88A?
My Rotel is an integrated amp with rca inputs for 8 channels and my Cambridge CXU player can do bass management BUT I do not think that I will survive longtime if the Significative Other knew that I would want to buy 1K device after already spent 549$ for nanoAvr-DL.

Quote:
If you want to develop a custom curve, you might find the guide linked in my sig useful.
Thank, I will take a look at it.

My system 5.1 :
ROTEL RSX-1562 /Fronts: B & W 804 D2 bi-amplified; surround : B&W 704 and center B&W HTM4d2/sub SVS PC 2000 /TV Samsung UN55ES8000
/BD player Cambridge CXU/ set-top (cable box) rented from cable co.
Bis Audio cables and power bar from the wall to the receiver
My room:15'4" x 11' 6" x 7'6" tv near the center of the long side wall
FargateOne is offline  
post #20764 of 20778 Old 11-29-2016, 04:07 PM
AVS Special Member
 
Waterboy77's Avatar
 
Join Date: Oct 2007
Location: Calgary, Alberta
Posts: 1,187
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 435 Post(s)
Liked: 200
I would like to do some measurements of my room to get a base line before I fill the cavity behind the screen wall with insulation. Trying to see the impact (good, bad or indifferent) of filling


What measurements are best to reflect this?
Typically I do the usual 8 and then LCR with subs.... 11 in total


I noticed on the first page that it is best to have a waterfall measurement that incorporates the LR and subs but I am unaware of a way to select this in REW.... just the 8 individual HDMI selections????



Also why is it recommended to turn of room correction if you are tying to measure the performance of the room??

Any assistance appreciated

One day I will start the new theater....... one day..... THAT DAY HAS ARRIVED
"If the women don't find you handsome, they should at least find you handy." Red Green
Family Cave Theater
Automation Thoughts/ Questions

Last edited by Waterboy77; 11-29-2016 at 04:10 PM. Reason: another question
Waterboy77 is offline  
post #20765 of 20778 Old 11-29-2016, 04:43 PM
AVS Addicted Member
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 14,217
Mentioned: 142 Post(s)
Tagged: 1 Thread(s)
Quoted: 5890 Post(s)
Liked: 3307
Quote:
Originally Posted by Waterboy77 View Post
I would like to do some measurements of my room to get a base line before I fill the cavity behind the screen wall with insulation. Trying to see the impact (good, bad or indifferent) of filling


What measurements are best to reflect this?
Typically I do the usual 8 and then LCR with subs.... 11 in total


I noticed on the first page that it is best to have a waterfall measurement that incorporates the LR and subs but I am unaware of a way to select this in REW.... just the 8 individual HDMI selections????



Also why is it recommended to turn of room correction if you are tying to measure the performance of the room??

Any assistance appreciated
To measure L+R+Subs, output the test signal to HDMI1 and HDMI2. Make sure the speakers are set to Small in the AVR, with crossover (80Hz is good). The subs receive the bass signal by virtue of bass management. Insulation behind the screen is likely to have the most effect in the low frequencies, which is what I expect your objective is.

Measuring the surrounds is not that important.
ahblaza likes this.
AustinJerry is online now  
post #20766 of 20778 Old 11-29-2016, 05:22 PM
AVS Special Member
 
Waterboy77's Avatar
 
Join Date: Oct 2007
Location: Calgary, Alberta
Posts: 1,187
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 435 Post(s)
Liked: 200
Quote:
Originally Posted by AustinJerry View Post
To measure L+R+Subs, output the test signal to HDMI1 and HDMI2. Make sure the speakers are set to Small in the AVR, with crossover (80Hz is good). The subs receive the bass signal by virtue of bass management. Insulation behind the screen is likely to have the most effect in the low frequencies, which is what I expect your objective is.

Measuring the surrounds is not that important.
Hi Jerry, attached is the measure screen, I don't see a way to select two outputs....??
Yes speakers are small and XO is 100Hz
Yes insulation for low fequencies and potential resonating... due to front wall construction
Attached Thumbnails
Click image for larger version

Name:	rew1.PNG
Views:	19
Size:	82.5 KB
ID:	1797473  

One day I will start the new theater....... one day..... THAT DAY HAS ARRIVED
"If the women don't find you handsome, they should at least find you handy." Red Green
Family Cave Theater
Automation Thoughts/ Questions
Waterboy77 is offline  
post #20767 of 20778 Old 11-29-2016, 05:55 PM
AVS Addicted Member
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 14,217
Mentioned: 142 Post(s)
Tagged: 1 Thread(s)
Quoted: 5890 Post(s)
Liked: 3307
Quote:
Originally Posted by Waterboy77 View Post
Hi Jerry, attached is the measure screen, I don't see a way to select two outputs....??
Yes speakers are small and XO is 100Hz
Yes insulation for low fequencies and potential resonating... due to front wall construction
Is that an old version of REW? The current version is v5.17 beta 9. The output screen is shown on page 63 of the REW Guide. Latest version of REW can be downloaded here: http://roomeqwizard.com/installers/.
AustinJerry is online now  
post #20768 of 20778 Old 11-29-2016, 06:28 PM
AVS Special Member
 
Waterboy77's Avatar
 
Join Date: Oct 2007
Location: Calgary, Alberta
Posts: 1,187
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 435 Post(s)
Liked: 200
Quote:
Originally Posted by AustinJerry View Post
Is that an old version of REW? The current version is v5.17 beta 9. The output screen is shown on page 63 of the REW Guide. Latest version of REW can be downloaded here: http://roomeqwizard.com/installers/.
Yup It's 5.16 with JRE
I now see there is a newer guide also....... my things seem to change quickly

Thanks
I will return when I get up to date and do some re-reading

Previous question that I am still curious about....
"Also why is it recommended to turn of room correction if you are trying to measure the performance of the room??"

One day I will start the new theater....... one day..... THAT DAY HAS ARRIVED
"If the women don't find you handsome, they should at least find you handy." Red Green
Family Cave Theater
Automation Thoughts/ Questions
Waterboy77 is offline  
post #20769 of 20778 Old 11-29-2016, 07:01 PM
AVS Special Member
 
artur9's Avatar
 
Join Date: Mar 2013
Location: near philly
Posts: 1,605
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 507 Post(s)
Liked: 162
Quote:
Originally Posted by Waterboy77 View Post
Yup It's 5.16 with JRE
Previous question that I am still curious about....
"Also why is it recommended to turn of room correction if you are trying to measure the performance of the room??"
The idea is to improve the room's "native" response before icing the cake with room correction.

IOW, for example, try to make the sub response as flat as possible and then use Audyssey or other to flatten it even more.
Waterboy77 likes this.
artur9 is online now  
post #20770 of 20778 Old Yesterday, 09:19 AM
AVS Special Member
 
LastButNotLeast's Avatar
 
Join Date: Feb 2007
Location: 08077
Posts: 7,443
Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 1357 Post(s)
Liked: 952
Quote:
Originally Posted by AustinJerry View Post
Is that an old version of REW? The current version is v5.17 beta 9.
Actually, it's 12, and it's here:
http://www.roomeqwizard.com/beta.html
Michael

Did you really need to quote that entire post in your reply?
Downloadable FREE demo discs: Demonstration Blu-Ray Discs (Independently Authored)
Welcome to AVS - Get out while you still can!
LastButNotLeast is offline  
post #20771 of 20778 Old Yesterday, 09:21 AM
AVS Special Member
 
Waterboy77's Avatar
 
Join Date: Oct 2007
Location: Calgary, Alberta
Posts: 1,187
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 435 Post(s)
Liked: 200
Quote:
Originally Posted by LastButNotLeast View Post
Actually, it's 12, and it's here:
http://www.roomeqwizard.com/beta.html
Michael
Yes when I checked for updates via REW beta 12 came up

One day I will start the new theater....... one day..... THAT DAY HAS ARRIVED
"If the women don't find you handsome, they should at least find you handy." Red Green
Family Cave Theater
Automation Thoughts/ Questions
Waterboy77 is offline  
post #20772 of 20778 Old Yesterday, 09:54 AM
AVS Addicted Member
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 14,217
Mentioned: 142 Post(s)
Tagged: 1 Thread(s)
Quoted: 5890 Post(s)
Liked: 3307
Quote:
Originally Posted by LastButNotLeast View Post
Actually, it's 12, and it's here:
http://www.roomeqwizard.com/beta.html
Michael
Quote:
Originally Posted by Waterboy77 View Post
Yes when I checked for updates via REW beta 12 came up
I always attempt to provide good information here, and appreciate LastButNotLeast keeping me honest. I neglected to see that the list of available updates, when sorted alphabetically, places updates later than beta 9 at the top of the list.

AustinJerry is online now  
post #20773 of 20778 Old Today, 04:31 PM
Member
 
MBrown2020's Avatar
 
Join Date: Aug 2013
Location: Wisconsin
Posts: 15
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Liked: 10
Jerry,

If you could please have a look at post #20762 when you have spare time. I wanted to see if I was doing things right.
Thanks
MBrown2020 is online now  
post #20774 of 20778 Old Today, 04:55 PM
Member
 
MBrown2020's Avatar
 
Join Date: Aug 2013
Location: Wisconsin
Posts: 15
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Liked: 10
Base dB level of measurement

How do you know the base dB level of a sweep to see how high and low the dips are?
As I understand it if my AVR is set to 0dB (Reference Level) and the measurement sweep is at -12 dB, is the base level at 93 dB (105dB - -12dB)? If AVR is at -5dB than base is 87dB (105- 12dB - 5).
Thanks
MBrown2020 is online now  
post #20775 of 20778 Old Today, 04:57 PM
AVS Addicted Member
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 14,217
Mentioned: 142 Post(s)
Tagged: 1 Thread(s)
Quoted: 5890 Post(s)
Liked: 3307
Quote:
Originally Posted by MBrown2020 View Post
Jerry,

If you could please have a look at post #20762 when you have spare time. I wanted to see if I was doing things right.
Thanks
Yes, later this evening.
AustinJerry is online now  
post #20776 of 20778 Old Today, 05:02 PM
AVS Special Member
 
Alan P's Avatar
 
Join Date: Jan 2003
Location: South Dakota
Posts: 8,791
Mentioned: 43 Post(s)
Tagged: 0 Thread(s)
Quoted: 4336 Post(s)
Liked: 3014
Quote:
Originally Posted by MBrown2020 View Post
I did some measurements moving the center channel at diff distances from wall. My range is min 15" from face of speaker to wall and max 42" from wall. Looks like 21" looked best?

mdat:https://www.dropbox.com/s/q4274wo3a7...eaks.mdat?dl=0


I also did some the sub tweak. Audyssey default was 15.5ft for both subs. I did measurements at 14.5-8.5 and 16.5-23.5. The three best ones look like 1=22.5 2=20.5 3=11.5. What do you think and did I do it right?

mdat: https://www.dropbox.com/s/1a8pjz11is...weak.mdat?dl=0
Thanks!
Not Jerry, but I took a look.

I think 15" off the wall looks just a bit better than 21". You get a bit more SPL in the 50-150hz range.

The sub distance of 20.5' looks best to me. There is a large peak at 128hz though that is present in all of the CC+subs measurements that isn't there in the CC only measurements...must be induced by the subs. Have you measured the subs alone and is that peak from their response? If so, you may be able to bring that down with sub placement.

My $.02.
Alan P is online now  
post #20777 of 20778 Old Today, 05:04 PM
AVS Addicted Member
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 14,217
Mentioned: 142 Post(s)
Tagged: 1 Thread(s)
Quoted: 5890 Post(s)
Liked: 3307
Quote:
Originally Posted by MBrown2020 View Post
How do you know the base dB level of a sweep to see how high and low the dips are?
As I understand it if my AVR is set to 0dB (Reference Level) and the measurement sweep is at -12 dB, is the base level at 93 dB (105dB - -12dB)? If AVR is at -5dB than base is 87dB (105- 12dB - 5).
Thanks
Yes, should be.

Pick a measurement, click on the Spectrogram tab, and then click Generate. The measurement peak is shown on the right of the screen.
AustinJerry is online now  
post #20778 of 20778 Old Today, 05:19 PM
Member
 
MBrown2020's Avatar
 
Join Date: Aug 2013
Location: Wisconsin
Posts: 15
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Liked: 10
Quote:
Originally Posted by Alan P View Post
Not Jerry, but I took a look.

I think 15" off the wall looks just a bit better than 21". You get a bit more SPL in the 50-150hz range.

The sub distance of 20.5' looks best to me. There is a large peak at 128hz though that is present in all of the CC+subs measurements that isn't there in the CC only measurements...must be induced by the subs. Have you measured the subs alone and is that peak from their response? If so, you may be able to bring that down with sub placement.

My $.02.
Thanks for giving it a look. The sub response does not have a peak at 128hz when measuring alone. The crossover for all speakers is at 80hz so I would think something with the center channel must be making it.

The 15" off the wall had more dips between 200-300 hz though, which I would think would be bad
MBrown2020 is online now  
Sponsored Links
Advertisement
 
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