Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 733 - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 1869Likes
 
Thread Tools
Old 03-19-2017, 12:20 PM
** Man of Leisure **
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 15,441
Mentioned: 165 Post(s)
Tagged: 1 Thread(s)
Quoted: 6890 Post(s)
Liked: 3826
Quote:
Originally Posted by trp3383 View Post
I recently picked up a umik-1 to measure my room and dual rythmik l22's. Room is around 1500cu ft. I'm trying to figure out rew, which is coming along slowly. I ran 2 sweeps with xt32 off, one with both subs set to low ht and another with them set to low music. Seems like I'm getting room gain into single digits with low music setting. Any pointers on where I should go from here? Was also wondering if grabbing a minidsp would help out? Thanks guys




Sent from my SM-G930V using Tapatalk
Couple of questions/comments:

- What do the terms "Low HT" and "Low Music" mean? These terms are foreign to me. Are these setting on the subs?
- Why measure with XT32 off? Typically we like to see XT32 on, since that is likely how you listen to the system.
- For measurements displaying the low frequencies, measure 15-300Hz, and don't use smoothing.
AustinJerry is online now  
Sponsored Links
Advertisement
 
Old 03-19-2017, 01:15 PM
Senior Member
 
trp3383's Avatar
 
Join Date: Nov 2008
Posts: 266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 99 Post(s)
Liked: 19
Low ht and low music are settings on the back of the subs. I took those without eq to see how the subs measured in the room before eqing. Here's the updated graph. Thanks



Sent from my SM-G930V using Tapatalk
trp3383 is online now  
Old 03-19-2017, 01:32 PM
AVS Forum Special Member
 
markus767's Avatar
 
Join Date: Apr 2009
Posts: 9,540
Mentioned: 81 Post(s)
Tagged: 0 Thread(s)
Quoted: 3767 Post(s)
Liked: 1347
Quote:
Originally Posted by AustinJerry View Post
Really? According to Markus, this should have been obvious.
...to Jerry. Most users don't have a clue what all these AVR settings are for and virtually all manufacturers fail miserably in explaining them.
unretarded likes this.

Markus

"In science, contrary evidence causes one to question a theory. In religion, contrary evidence causes one to question the evidence." - Floyd Toole
markus767 is offline  
 
Old 03-19-2017, 04:43 PM
** Man of Leisure **
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 15,441
Mentioned: 165 Post(s)
Tagged: 1 Thread(s)
Quoted: 6890 Post(s)
Liked: 3826
Quote:
Originally Posted by artur9 View Post
Is that in your updated section? That would be very helpful to note.
Quote:
Originally Posted by markus767 View Post
...to Jerry. Most users don't have a clue what all these AVR settings are for and virtually all manufacturers fail miserably in explaining them.
OK, I'll insert an explanation for the unenlightened. Tomorrow at the earliest.
Medi0gre and unretarded like this.
AustinJerry is online now  
Old 03-19-2017, 05:07 PM
AVS Forum Special Member
 
LastButNotLeast's Avatar
 
Join Date: Feb 2007
Location: 08077
Posts: 7,900
Mentioned: 33 Post(s)
Tagged: 1 Thread(s)
Quoted: 1544 Post(s)
Liked: 1151
The unenlightened among us will really appreciate it.

Michael
ahblaza, Medi0gre and unretarded like this.

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!
For most of the time, the here and now is neither now nor here. Graham Swift
LastButNotLeast is offline  
Old 03-19-2017, 05:56 PM
Advanced Member
 
Join Date: Nov 2016
Location: Ventura Ca
Posts: 725
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 263 Post(s)
Liked: 167
As suggested by @AustinJerry and others, I have followed best practices and the Toole white paper that suggests best results are achieved with all subs in mono or LFE.


I have positioned the subs at 1/2 room for all 4 subs, mid point of all 4 walls, with the 2 side subs 1/4 spaced from walls.

I did a bunch of sweeps to get the best results, which is the current location and the right sub phase switch at 180, all other subs at 0.

AVR LPF/crossover set at 100hz.....


This graph is with MCACC on and off, with MCACC ON yielding the flatter response, no minidsp yet as it has not showed up. I ordered the minidsp directly from the site, not realizing they are in a land far far away.

Gold is NO MCACC.......
Attached Thumbnails
Click image for larger version

Name:	new sweeps in mono.jpg
Views:	50
Size:	61.6 KB
ID:	2037289  

Link to budget Home Theater build

http://www.avsforum.com/forum/19-ded...i-version.html
unretarded is offline  
Old 03-19-2017, 08:05 PM
AVS Forum Special Member
 
LastButNotLeast's Avatar
 
Join Date: Feb 2007
Location: 08077
Posts: 7,900
Mentioned: 33 Post(s)
Tagged: 1 Thread(s)
Quoted: 1544 Post(s)
Liked: 1151
What AVR do you have? The older ones (like my SC-1223) don't do any eq for subs.
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!
For most of the time, the here and now is neither now nor here. Graham Swift
LastButNotLeast is offline  
Old 03-19-2017, 08:24 PM
** Man of Leisure **
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 15,441
Mentioned: 165 Post(s)
Tagged: 1 Thread(s)
Quoted: 6890 Post(s)
Liked: 3826
Quote:
Originally Posted by unretarded View Post
As suggested by @AustinJerry and others, I have followed best practices and the Toole white paper that suggests best results are achieved with all subs in mono or LFE.


I have positioned the subs at 1/2 room for all 4 subs, mid point of all 4 walls, with the 2 side subs 1/4 spaced from walls.

I did a bunch of sweeps to get the best results, which is the current location and the right sub phase switch at 180, all other subs at 0.

AVR LPF/crossover set at 100hz.....


This graph is with MCACC on and off, with MCACC ON yielding the flatter response, no minidsp yet as it has not showed up. I ordered the minidsp directly from the site, not realizing they are in a land far far away.

Gold is NO MCACC.......
I am sure you had a reason to place all four subs at the 1/2 mark, but have you tried other placements? For my four subs, I get the flattest response by placing two at the 1/2 mark, and the other two at the 1/4 and 3/4 marks on the front wall. Looking at the freqency response you posted, you could probably do better. I would try other placements.

And why did you flip the polarity on one sub? Did the REW impulse response reveal that the polarity was reversed? Did you actually check the impulse response?
AustinJerry is online now  
Old 03-19-2017, 10:01 PM
Advanced Member
 
Join Date: Nov 2016
Location: Ventura Ca
Posts: 725
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 263 Post(s)
Liked: 167
Quote:
Originally Posted by LastButNotLeast View Post
What AVR do you have? The older ones (like my SC-1223) don't do any eq for subs.
Michael
Newer cheap pioneer elite vsx lx-301....advanced MCACC, not MCACC pro like the nice recievers, and it has a sub eq....5 channel.

Link to budget Home Theater build

http://www.avsforum.com/forum/19-ded...i-version.html
unretarded is offline  
Old 03-19-2017, 10:10 PM
Advanced Member
 
Join Date: Nov 2016
Location: Ventura Ca
Posts: 725
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 263 Post(s)
Liked: 167
Quote:
Originally Posted by AustinJerry View Post
I am sure you had a reason to place all four subs at the 1/2 mark, but have you tried other placements? For my four subs, I get the flattest response by placing two at the 1/2 mark, and the other two at the 1/4 and 3/4 marks on the front wall. Looking at the freqency response you posted, you could probably do better. I would try other placements.

And why did you flip the polarity on one sub? Did the REW impulse response reveal that the polarity was reversed? Did you actually check the impulse response?

I tried a quite a few placements. I am stuck with one directly center rear firing into the MLP seating. I tried all 3 front wall, 1 center and at the 1/4 and 3/4.

Then I moved them a foot at a time up the side walls until 1/2, then moved them out to 1/4 from side walls at mid point of side walls.

I am in a almost square room.....11 foot 6 inches wide x 12 foot 9 inches deep..... Seating is approx. 1/3rd room distance...between 1/3rd and 1/4..

I just flipped the polarity on the subs in all kinds of combinations to see which gave the best response.

I did not check the impulse response since I do not have the minidsp yet .......

I thought it,the response looked pretty good......

I am not complaining that it can get better, I like that !

EDIT:
If I am reading the graph correctly I am at approx. +/- 5db , the paperwork on the subs states it is +/- 3db......or with work and a minidsp can it exceed the rated +/- 3 db ?

Link to budget Home Theater build

http://www.avsforum.com/forum/19-ded...i-version.html

Last edited by unretarded; 03-19-2017 at 10:13 PM.
unretarded is offline  
Old 03-19-2017, 10:29 PM
AVS Forum Addicted Member
 
sdurani's Avatar
 
Join Date: Oct 2001
Location: Monterey Park, CA
Posts: 24,783
Mentioned: 77 Post(s)
Tagged: 0 Thread(s)
Quoted: 4600 Post(s)
Liked: 3014
Quote:
Originally Posted by AustinJerry View Post
I am sure you had a reason to place all four subs at the 1/2 mark...
From Welti's subwoofer placement paper:

unretarded likes this.

Sanjay
sdurani is online now  
Old 03-19-2017, 10:40 PM
Advanced Member
 
Join Date: Nov 2016
Location: Ventura Ca
Posts: 725
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 263 Post(s)
Liked: 167
Quote:
Originally Posted by sdurani View Post
From Welti's subwoofer placement paper:


I might have to try 2 front center and 2 rear center......might get me some extra extension.

Thanks!

Link to budget Home Theater build

http://www.avsforum.com/forum/19-ded...i-version.html
unretarded is offline  
Old 03-20-2017, 01:09 AM
Advanced Member
 
Join Date: Nov 2016
Location: Ventura Ca
Posts: 725
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 263 Post(s)
Liked: 167
Here is 2 center front and 2 center rear...........side by side. Crossed over at 80hz.


It is +/- 3db except for the giant room induced hole around 70hz.......
Attached Thumbnails
Click image for larger version

Name:	final final no mcacc.jpg
Views:	48
Size:	64.8 KB
ID:	2037809  

Link to budget Home Theater build

http://www.avsforum.com/forum/19-ded...i-version.html
unretarded is offline  
Old 03-20-2017, 06:31 AM
** Man of Leisure **
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 15,441
Mentioned: 165 Post(s)
Tagged: 1 Thread(s)
Quoted: 6890 Post(s)
Liked: 3826
Quote:
Originally Posted by unretarded View Post
Here is 2 center front and 2 center rear...........side by side. Crossed over at 80hz.


It is +/- 3db except for the giant room induced hole around 70hz.......
Just curious, why did you shorten the vertical scale? Typically, we recommend the scale to be configured in 5dB increments, say 50-100dB. The smaller increments make the response curve look much worse than it is. And with the scale as it is, we can't even see the bottom of that massive dip. Your last post had the vertical scale configured properly.
AustinJerry is online now  
Old 03-20-2017, 06:48 AM
AVS Forum Special Member
 
LastButNotLeast's Avatar
 
Join Date: Feb 2007
Location: 08077
Posts: 7,900
Mentioned: 33 Post(s)
Tagged: 1 Thread(s)
Quoted: 1544 Post(s)
Liked: 1151
Quote:
Originally Posted by unretarded View Post
and it has a sub eq....5 channel.
Sort of.

You'll do much better with the minidsp.
Michael
Attached Thumbnails
Click image for larger version

Name:	Screen shot 2017-03-20 at 9.46.09 AM.png
Views:	38
Size:	37.1 KB
ID:	2037913  
unretarded likes this.

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!
For most of the time, the here and now is neither now nor here. Graham Swift
LastButNotLeast is offline  
Old 03-20-2017, 10:38 AM
** Man of Leisure **
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 15,441
Mentioned: 165 Post(s)
Tagged: 1 Thread(s)
Quoted: 6890 Post(s)
Liked: 3826
Quote:
Originally Posted by artur9 View Post
Is that in your updated section? That would be very helpful to note.
Quote:
Originally Posted by LastButNotLeast View Post
The unenlightened among us will really appreciate it.

Michael
As per the request, I have updated the new section in the Guide with a description of how AVR's handle the distance settings to determine speaker delays. Please review and comment as appropriate.
AustinJerry is online now  
Old 03-20-2017, 12:55 PM
Advanced Member
 
Join Date: Nov 2016
Location: Ventura Ca
Posts: 725
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 263 Post(s)
Liked: 167
Quote:
Originally Posted by AustinJerry View Post
Just curious, why did you shorten the vertical scale? Typically, we recommend the scale to be configured in 5dB increments, say 50-100dB. The smaller increments make the response curve look much worse than it is. And with the scale as it is, we can't even see the bottom of that massive dip. Your last post had the vertical scale configured properly.
Sorry about that, I will post a correctly scaled one when I get home.


I like a finer scale on things.....

Trying to get resolution better than +/- 3db on a 5 db scale triggers my OCD....

I moved them back to the center of all 4 walls after that......still unsure where they will end up, only fixed one is the rear center.

I am open to putting the other 3 wherever they work the best.

Link to budget Home Theater build

http://www.avsforum.com/forum/19-ded...i-version.html
unretarded is offline  
Old 03-20-2017, 12:59 PM
AVS Forum Special Member
 
LastButNotLeast's Avatar
 
Join Date: Feb 2007
Location: 08077
Posts: 7,900
Mentioned: 33 Post(s)
Tagged: 1 Thread(s)
Quoted: 1544 Post(s)
Liked: 1151
Quote:
Originally Posted by AustinJerry View Post
As per the request, I have updated the new section in the Guide with a description of how AVR's handle the distance settings to determine speaker delays. Please review and comment as appropriate.
RF impulse response is furthest RIGHT, no?
Michael
Attached Thumbnails
Click image for larger version

Name:	rew.JPG
Views:	30
Size:	40.0 KB
ID:	2038817  

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!
For most of the time, the here and now is neither now nor here. Graham Swift
LastButNotLeast is offline  
Old 03-20-2017, 01:11 PM
** Man of Leisure **
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 15,441
Mentioned: 165 Post(s)
Tagged: 1 Thread(s)
Quoted: 6890 Post(s)
Liked: 3826
Quote:
Originally Posted by LastButNotLeast View Post
RF impulse response is furthest RIGHT, no?
Michael
Yes, nice catch. Fixed, thanks.
AustinJerry is online now  
Old 03-20-2017, 03:10 PM
AVS Forum Special Member
 
artur9's Avatar
 
Join Date: Mar 2013
Location: near philly
Posts: 1,730
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 575 Post(s)
Liked: 200
Quote:
Originally Posted by unretarded View Post
I moved them back to the center of all 4 walls after that......still unsure where they will end up, only fixed one is the rear center..
I would do it Geddes-style. Leave that fixed one wherever it is. Then place one at the mid-point of one of the walls and adjust its phase and level to improve the response. Then repeat with the subsequent subwoofers but put them in random locations.

I was messing around last night with amps and ended up with the below.

Attached Thumbnails
Click image for larger version

Name:	new amp attempt.jpg
Views:	146
Size:	44.6 KB
ID:	2039041  
unretarded likes this.
artur9 is offline  
Old 03-20-2017, 04:17 PM
** Man of Leisure **
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 15,441
Mentioned: 165 Post(s)
Tagged: 1 Thread(s)
Quoted: 6890 Post(s)
Liked: 3826
Quote:
Originally Posted by artur9 View Post
I would do it Geddes-style. Leave that fixed one wherever it is. Then place one at the mid-point of one of the walls and adjust its phase and level to improve the response. Then repeat with the subsequent subwoofers but put them in random locations.

I was messing around last night with amps and ended up with the below.

I see mention of Lyngdorf and Krell in the legend. Do you have this equipment? Are you using RoomPerfect?

And why the abrupt drop-off at 25Hz?
AustinJerry is online now  
Old 03-20-2017, 04:55 PM
Advanced Member
 
Join Date: Nov 2016
Location: Ventura Ca
Posts: 725
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 263 Post(s)
Liked: 167
Quote:
Originally Posted by artur9 View Post
I would do it Geddes-style. Leave that fixed one wherever it is. Then place one at the mid-point of one of the walls and adjust its phase and level to improve the response. Then repeat with the subsequent subwoofers but put them in random locations.

I was messing around last night with amps and ended up with the below.

NICE!

That was sort of my original plan.......sweep move, sweep move,sweep move, until the ideal locations were found........

I was thinking in a 6 inch grid pattern, sweep, check response....move 6 inches,sweep,check response, move 6 inches.....do this is a grid style thru all the available locations. Letting each sub end up where ever was best.

I enjoy all of this stuff, so hundreds of sweeps is fine by me, it is a hobby for fun.......probably spent over 10 hours yesterday sweeping and playing......changing settings,location,eq,room correction etc etc etc for all the locations.

Sweeping single subs, multiple subs etc etc etc.

Link to budget Home Theater build

http://www.avsforum.com/forum/19-ded...i-version.html
unretarded is offline  
Old 03-20-2017, 05:56 PM
AVS Forum Special Member
 
artur9's Avatar
 
Join Date: Mar 2013
Location: near philly
Posts: 1,730
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 575 Post(s)
Liked: 200
Quote:
Originally Posted by AustinJerry View Post
I see mention of Lyngdorf and Krell in the legend. Do you have this equipment? Are you using RoomPerfect?
Yes and yes. I have the Krell Foundation for HT and a Lyngdorf DPA-1 for 2 channel. Although the measurement was with Lyngdorf-only and RoomPerfect bypassed. RoomPerfect says it applies 4% correction, whatever that means, but I assume not much.

Quote:
And why the abrupt drop-off at 25Hz?
All my subs are small. None are rated to below 30Hz.
artur9 is offline  
Old 03-20-2017, 05:58 PM
AVS Forum Special Member
 
artur9's Avatar
 
Join Date: Mar 2013
Location: near philly
Posts: 1,730
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 575 Post(s)
Liked: 200
Quote:
Originally Posted by unretarded View Post
NICE!
...
That was sort of my original plan.......sweep move, sweep move,sweep move, until the ideal locations were found........
Thanks. I am not as gleeful as you are with all the measuring but an enthusiast has to do what an enthusiast has to do.

BTW, it might be easier to place the sub in the MLP and move the mic around. Just saying....
unretarded likes this.
artur9 is offline  
Old 03-21-2017, 10:49 AM
AVS Forum Addicted Member
 
PlasmaPZ80U's Avatar
 
Join Date: Feb 2009
Posts: 11,305
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1987 Post(s)
Liked: 568
So I measured my impulse response of all 5 speakers and sub, Room Correction off, bass management off, speakers 15-20,000Hz and LFE channel 15-300Hz with acoustic timing reference set to right surround speaker as it is closest to MLP. I left the speaker and sub distances at where YPAO set them, which is:

FL 7.2ft
FR 5.8ft
CC 6.2ft
SL 4.6ft
SR 4.4ft
SW 6.4ft (was 8.4ft before sw dist tweak but set at 6.4ft during these measures)

https://drive.google.com/file/d/0B2P...ew?usp=sharing (mdat file)


Issue is FL, FR, CC all are before 0ms and SL and SR are at 0ms. Why is that considering YPAO set these distances/delays and they are very close/matching tape measured distances?

UN46EH6030 Calibration/Settings
Samsung UN46EH6030; Yamaha HTR-3066, SVS Prime Bookshelf Mains and Prime Center, Cambridge S20 Surrounds, Rythmik LV12R; PS4, Xbox One, Xfinity X1 (CI CXD01ANI)
PlasmaPZ80U is online now  
Old 03-21-2017, 11:00 AM
AVS Forum Special Member
 
LastButNotLeast's Avatar
 
Join Date: Feb 2007
Location: 08077
Posts: 7,900
Mentioned: 33 Post(s)
Tagged: 1 Thread(s)
Quoted: 1544 Post(s)
Liked: 1151
Probably for the same reason I get different results using MCACC: the mic and placement are different.
Fortunately, I have 6 MCACC presets, so I can make changes and compare the results easily.
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!
For most of the time, the here and now is neither now nor here. Graham Swift
LastButNotLeast is offline  
Old 03-21-2017, 11:11 AM
AVS Forum Addicted Member
 
PlasmaPZ80U's Avatar
 
Join Date: Feb 2009
Posts: 11,305
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1987 Post(s)
Liked: 568
Quote:
Originally Posted by LastButNotLeast View Post
Probably for the same reason I get different results using MCACC: the mic and placement are different.
Fortunately, I have 6 MCACC presets, so I can make changes and compare the results easily.
Michael
Mic placement is very similar, but likely a few inches off in the XYZ space.

Anyhow, one related question I had about IR measures in general is must the non bass managed speaker sweeps start at 15Hz? My fronts are ported bookshelves and are rated -6dB at 48Hz and my surrounds are rated down to only 80Hz, unspecified dB point and are sealed sats.

Could I set the start frequency to 80Hz for all 5 speakers OR 15Hz start frequency, leaving bass management on but with sub plate amp off?
PlasmaPZ80U is online now  
Old 03-21-2017, 11:48 AM
** Man of Leisure **
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 15,441
Mentioned: 165 Post(s)
Tagged: 1 Thread(s)
Quoted: 6890 Post(s)
Liked: 3826
Quote:
Originally Posted by PlasmaPZ80U View Post
So I measured my impulse response of all 5 speakers and sub, Room Correction off, bass management off, speakers 15-20,000Hz and LFE channel 15-300Hz with acoustic timing reference set to right surround speaker as it is closest to MLP. I left the speaker and sub distances at where YPAO set them, which is:

FL 7.2ft
FR 5.8ft
CC 6.2ft
SL 4.6ft
SR 4.4ft
SW 6.4ft (was 8.4ft before sw dist tweak but set at 6.4ft during these measures)

https://drive.google.com/file/d/0B2P...ew?usp=sharing (mdat file)


Issue is FL, FR, CC all are before 0ms and SL and SR are at 0ms. Why is that considering YPAO set these distances/delays and they are very close/matching tape measured distances?
Let's put this in perspective. The alignment difference between the FL and FR speakers is .22ft, or .2ms. That is insignificant. The alignment difference between the FL and the SR (the timing reference),is .93ft, or .83ms, also quite small. Keep in mind that the MCACC and the REW mic are different mics, and being able to place the REW mic in exactly the same spot at the MCACC mic would be extremely difficult. I think the differences you are seeing are due to mic placement variations, and I would not adjust the MCACC settings based on the REW measurements.

I was also very concerned with comparing REW impulse response measurements with the results from automated room correction. As a Dirac Live user, I am fortunate to be able to use the UMIK-1 mic for both the REW measurements and the Dirac calibration. I conducted this experiment:

1. Place the UMIK-1 in the MLP.
2. Run a one-position Dirac calibration and save the results to an 88A pre-set.
3. Using the 88A Utility program, observe the Dirac delays.
4. Without moving the mic, run the REW measurements for each channel.
5. Using the REW Impulse Response Overlay, observe speaker alignment with the Dirac delays.

The results are shown below. Without moving the mic, the alignment looks perfect, IMO. IOW, room correction does a fine job aligning speakers.
Attached Thumbnails
Click image for larger version

Name:	Time-alignment with Dirac.jpg
Views:	34
Size:	68.2 KB
ID:	2040361  
AustinJerry is online now  
Old 03-21-2017, 11:51 AM
AVS Forum Special Member
 
LastButNotLeast's Avatar
 
Join Date: Feb 2007
Location: 08077
Posts: 7,900
Mentioned: 33 Post(s)
Tagged: 1 Thread(s)
Quoted: 1544 Post(s)
Liked: 1151
Now I just have to figure out how to keep my HEAD in exactly the same place every time.

Michael
ahblaza likes this.

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!
For most of the time, the here and now is neither now nor here. Graham Swift
LastButNotLeast is offline  
Old 03-21-2017, 11:51 AM
** Man of Leisure **
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 15,441
Mentioned: 165 Post(s)
Tagged: 1 Thread(s)
Quoted: 6890 Post(s)
Liked: 3826
Quote:
Originally Posted by LastButNotLeast View Post
Probably for the same reason I get different results using MCACC: the mic and placement are different.
Fortunately, I have 6 MCACC presets, so I can make changes and compare the results easily.
Michael
As I recommended in my previous post, I would be inclined to accept the MCACC results with out change. You say you can "compare the results easily". I question whether you can hear minor delay adjustments by listening only. Maybe you have golden ears--I don't know.
ahblaza likes this.
AustinJerry is online now  
Sponsored Links
Advertisement
 
 

Tags
Dayton , Dayton Audio , Room Equilizer Wizard Rew
Thread Tools


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