Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 247 - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 1745Likes
Reply
 
Thread Tools
post #7381 of 21672 Old 12-12-2013, 09:37 AM
AVS Forum Special Member
 
jim19611961's Avatar
 
Join Date: Mar 2011
Location: Texas
Posts: 1,860
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 449 Post(s)
Liked: 153
Quote:
Originally Posted by Brian Fineberg View Post

could be a pretty good guess. the ceiling being the more of the two...I do have a very thick shaggy carpet on the floor but it might not fully cover the reflection.

and before everyone starts saying how I need to move it out of the corner yaddy yaddy yada...I am well aware the placement of the entire thing isnt ideal..but its what I have for the next 2 years or so...until we relocate (due to increasing size of family in may biggrin.gif) so I am trying to get the best response out of what I am dealt with ...ya dig?

EDIT: it could be an audyssey problem (mic placement) because before adding the second sub (and thus re reunning audyssey) my response +100hz wasnt as bad...as you can see in this graph

I think I have that exact carpet. Walmart special? By itself, that carpet is useless in the range of frequencies we are concerned with. In my experience, and in my room, I have/had 3-4 carpets of that type on top of each other and it barely deals with 1K sufficiently, much less 100-350hz.

If you cant move out of that left corner, you could put treatment there (4" OC703 or equivalent on that adjacent wall).

If you use sliced ETC's, you can gain insight to the frequency content of a given bounce.

Also keep in mind, especially when considering floor bounce, that blocking or redirecting the bounce is often as effective as trying to absorb it.

edit: at what frequency range are your subs operating? (yes, the before plot does look better).

My Room
My Music
Rega - Apollo, Rega - DAC, Goldpoint Passive, Classe CA-100, Crown XLS 1002, miniDSP
Jenzen Next
jim19611961 is offline  
Sponsored Links
Advertisement
 
post #7382 of 21672 Old 12-12-2013, 09:42 AM
 
Brian Fineberg's Avatar
 
Join Date: Feb 2002
Posts: 8,302
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 3543 Post(s)
Liked: 3515
Quote:
Originally Posted by Selden Ball View Post

You might want to consider heavy drapes for the windows instead of light-weight curtains. Drapes will help to reduce the audio reflections on that side and the light reflections off the TV's screen.

just an fyi those are actually heavy weight blacked out drapes..not light curtains...I have run ETA and they make a HUGE dent (bring that reflection to almost -20 ) in the first reflection point
Brian Fineberg is offline  
post #7383 of 21672 Old 12-12-2013, 10:44 AM
AVS Forum Special Member
 
artur9's Avatar
 
Join Date: Mar 2013
Location: near philly
Posts: 1,690
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 547 Post(s)
Liked: 189
I have my center on a shelf under the TV and over a cabinet. Nearfield (at most 2-3 feet) it sounds good to me but at the MLP it sounds a bit boomy. What are the possible causes of that?

Putting some dampening material under the center helped a little as well as pulling the cabinet out a few inches and putting some 2"x2'x2' foam between the cabinet and the wall.

Besides continuing to fill that crevice with absorption what else could I do?
artur9 is offline  
 
post #7384 of 21672 Old 12-12-2013, 10:48 AM
AVS Forum Special Member
 
jim19611961's Avatar
 
Join Date: Mar 2011
Location: Texas
Posts: 1,860
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 449 Post(s)
Liked: 153
Quote:
Originally Posted by artur9 View Post

I have my center on a shelf under the TV and over a cabinet. Nearfield (at most 2-3 feet) it sounds good to me but at the MLP it sounds a bit boomy. What are the possible causes of that?

Putting some dampening material under the center helped a little as well as pulling the cabinet out a few inches and putting some 2"x2'x2' foam between the cabinet and the wall.

Besides continuing to fill that crevice with absorption what else could I do?

Pic?

My Room
My Music
Rega - Apollo, Rega - DAC, Goldpoint Passive, Classe CA-100, Crown XLS 1002, miniDSP
Jenzen Next
jim19611961 is offline  
post #7385 of 21672 Old 12-12-2013, 11:18 AM
AVS Forum Addicted Member
 
Selden Ball's Avatar
 
Join Date: Jan 2001
Location: upstate NY
Posts: 11,897
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 3093 Post(s)
Liked: 1511
"Boomy" suggests to me that the high frequencies might be having problems. Make sure that the speaker is tilted so its tweeter points toward ear-height at the primary listening position.

Selden

Marantz SR7009 avr + MM9000 amp --> Atmos 7.1.4
Fronts=NHT 2.9+AC2, FH+TM=DefTech PM1000, LCR+TM amped
Selden Ball is offline  
post #7386 of 21672 Old 12-12-2013, 11:21 AM
** Man of Leisure **
 
AustinJerry's Avatar
 
Join Date: Jan 2003
Location: Austin, Texas
Posts: 15,123
Mentioned: 159 Post(s)
Tagged: 1 Thread(s)
Quoted: 6630 Post(s)
Liked: 3661
Quote:
Originally Posted by artur9 View Post

I have my center on a shelf under the TV and over a cabinet. Nearfield (at most 2-3 feet) it sounds good to me but at the MLP it sounds a bit boomy. What are the possible causes of that?

Putting some dampening material under the center helped a little as well as pulling the cabinet out a few inches and putting some 2"x2'x2' foam between the cabinet and the wall.

Besides continuing to fill that crevice with absorption what else could I do?

I had a similar situation, and I pulled the center speaker off of the shelf and placed it on a speaker stand (http://www.sanus.com/ap/en/products/speaker-foundations/sp-steel/SFC22). The improvement was significant. You can see a picture in the My Setup link in my signature.
AustinJerry is offline  
post #7387 of 21672 Old 12-12-2013, 11:24 AM
AVS Forum Special Member
 
artur9's Avatar
 
Join Date: Mar 2013
Location: near philly
Posts: 1,690
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 547 Post(s)
Liked: 189
Quote:
Originally Posted by jim19611961 View Post

Pic?

From a posting elsewhere. The shelf I mean is the one with DVDs and a phone on it. For a while I was using a phantom but then I discovered that some things are mixed assuming a center and my prepro wasn't compensating correctly (e.g. STTOS on netflix).

artur9 is offline  
post #7388 of 21672 Old 12-12-2013, 11:28 AM
AVS Forum Special Member
 
cfraser's Avatar
 
Join Date: Aug 2002
Location: Toronto area, Canada
Posts: 1,450
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 128 Post(s)
Liked: 73
Quote:
Originally Posted by AustinJerry View Post

I had a similar situation, and I pulled the center speaker off of the shelf and placed it on a speaker stand (http://www.sanus.com/ap/en/products/speaker-foundations/sp-steel/SFC22). The improvement was significant. You can see a picture in the My Setup link in my signature.

I did the same thing, but not the same stand. In between the shelf and the stand, I also tried floor placement. Not awful, but way too awkward to angle it upwards so much, and hard on the ankles...
cfraser is offline  
post #7389 of 21672 Old 12-12-2013, 11:29 AM
AVS Forum Special Member
 
artur9's Avatar
 
Join Date: Mar 2013
Location: near philly
Posts: 1,690
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 547 Post(s)
Liked: 189
Quote:
Originally Posted by AustinJerry View Post

I had a similar situation, and I pulled the center speaker off of the shelf and placed it on a speaker stand (http://www.sanus.com/ap/en/products/speaker-foundations/sp-steel/SFC22). The improvement was significant. You can see a picture in the My Setup link in my signature.

I think to do that I'd have to get rid of the whole cabinet underneath. My wife is rather fond of it.

I suspect the shelf I'm using may be too resonant for the purpose. Either that or the cavity formed between it and the cabinet/electronics is creating some resonance. I'm not certain as I don't know how to look for this phenomenon in REW.
artur9 is offline  
post #7390 of 21672 Old 12-12-2013, 11:31 AM
AVS Forum Special Member
 
artur9's Avatar
 
Join Date: Mar 2013
Location: near philly
Posts: 1,690
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 547 Post(s)
Liked: 189
Quote:
Originally Posted by Selden Ball View Post

"Boomy" suggests to me that the high frequencies might be having problems. Make sure that the speaker is tilted so its tweeter points toward ear-height at the primary listening position.

I think I did that. Could it be rear wall reflections?
artur9 is offline  
post #7391 of 21672 Old 12-12-2013, 11:40 AM
AVS Forum Special Member
 
jim19611961's Avatar
 
Join Date: Mar 2011
Location: Texas
Posts: 1,860
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 449 Post(s)
Liked: 153
Quote:
Originally Posted by artur9 View Post

From a posting elsewhere. The shelf I mean is the one with DVDs and a phone on it. For a while I was using a phantom but then I discovered that some things are mixed assuming a center and my prepro wasn't compensating correctly (e.g. STTOS on netflix).


Yes. The top of that shelve, the semi-enclosed area underneath it, and the cabinet in general may be creating unwanted effects.

I can only advise experimentation and measurement for no sure thing fix comes to mind.

My Room
My Music
Rega - Apollo, Rega - DAC, Goldpoint Passive, Classe CA-100, Crown XLS 1002, miniDSP
Jenzen Next
jim19611961 is offline  
post #7392 of 21672 Old 12-12-2013, 02:24 PM
AVS Forum Special Member
 
markus767's Avatar
 
Join Date: Apr 2009
Posts: 9,394
Mentioned: 78 Post(s)
Tagged: 0 Thread(s)
Quoted: 3656 Post(s)
Liked: 1304
Quote:
Originally Posted by artur9 View Post

I think I did that. Could it be rear wall reflections?

You mean the front wall (wall behind the speakers)? http://www.genelec.com/learning-center/presentations-tutorials/flush-mounting/

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  
post #7393 of 21672 Old 12-12-2013, 08:26 PM
 
Brian Fineberg's Avatar
 
Join Date: Feb 2002
Posts: 8,302
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 3543 Post(s)
Liked: 3515
latest graph duals w/ LR mains...much better response...apparantly i was nuetering the ability of subEQ in the x4000 by how I had the minidsp setup:

Brian Fineberg is offline  
post #7394 of 21672 Old 12-12-2013, 08:36 PM
AVS Forum Special Member
 
artur9's Avatar
 
Join Date: Mar 2013
Location: near philly
Posts: 1,690
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 547 Post(s)
Liked: 189
Quote:
Originally Posted by markus767 View Post

You mean the front wall (wall behind the speakers)? http://www.genelec.com/learning-center/presentations-tutorials/flush-mounting/

Yeah, I had wanted to do that but the studs in that wall weren't far enough apart for my last center. This one is significantly smaller so I may attempt it.


When I said rear walls I meant the one behind the MLP, not the one behind the center. I still don't have sufficient absorption back there.
artur9 is offline  
post #7395 of 21672 Old 12-13-2013, 04:36 PM
AVS Forum Special Member
 
jim19611961's Avatar
 
Join Date: Mar 2011
Location: Texas
Posts: 1,860
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 449 Post(s)
Liked: 153
No posts today?

What a bunch of slackers biggrin.gif

My Room
My Music
Rega - Apollo, Rega - DAC, Goldpoint Passive, Classe CA-100, Crown XLS 1002, miniDSP
Jenzen Next
jim19611961 is offline  
post #7396 of 21672 Old 12-14-2013, 10:52 AM
AVS Forum Special Member
 
cuzed2's Avatar
 
Join Date: Nov 2006
Location: Chicago Area
Posts: 4,940
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 187 Post(s)
Liked: 239
Quote:
Originally Posted by jim19611961 View Post

No posts today?

What a bunch of slackers biggrin.gif

I'm headed to the basement now to a bunch of test sweeps with varying locations for my mains....

Cuzed2
CuznEddy Cinema
Officially Hanesamatized on 8/1/09
cuzed2 is offline  
post #7397 of 21672 Old 12-14-2013, 04:39 PM
Advanced Member
 
Digione's Avatar
 
Join Date: Dec 2002
Location: New Jersey
Posts: 682
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Liked: 35
Quote:
Originally Posted by jim19611961 View Post

No posts today?

What a bunch of slackers biggrin.gif

Spent my whole day taking measurements with different methods of trying to reduce my primary floor reflection. Will post later when I get my head together. smile.gif
Digione is offline  
post #7398 of 21672 Old 12-14-2013, 08:26 PM
Senior Member
 
Audionut11's Avatar
 
Join Date: May 2008
Posts: 471
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 162 Post(s)
Liked: 65
Quote:
Originally Posted by jim19611961 View Post

No posts today?

What a bunch of slackers biggrin.gif

Active Bi-Amped yesterday. Passive crossover be gone!
Audionut11 is offline  
post #7399 of 21672 Old 12-14-2013, 09:25 PM
AVS Forum Special Member
 
angryht's Avatar
 
Join Date: Aug 2004
Location: Omaha, NE
Posts: 1,339
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Liked: 11
My laptop has an SPDIF output (same 3.5 mm as the headphones) What are my options? Do I need to get a sound card or can I just use a 3.5 mm to stereo RCA jack. Can I get a 3.5 mm to digital coax adapter?

-Greg
angryht is offline  
post #7400 of 21672 Old 12-15-2013, 01:51 AM
AVS Forum Special Member
 
markus767's Avatar
 
Join Date: Apr 2009
Posts: 9,394
Mentioned: 78 Post(s)
Tagged: 0 Thread(s)
Quoted: 3656 Post(s)
Liked: 1304
^
That output is probably optical?
Anyway, you need an output (to send a test signal to the speaker) and an input (to receive the response from the microphone).

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  
post #7401 of 21672 Old 12-15-2013, 07:49 AM
AVS Forum Special Member
 
angryht's Avatar
 
Join Date: Aug 2004
Location: Omaha, NE
Posts: 1,339
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Liked: 11
Right. I understand that I need an output and an input. For the input I plan on getting a USB mic. My specific question is regarding the output. It's a small headphone jack (3.5 mm) and it is labeled with the headphone symbol and SPDIF. From what I understand, that means I could get an adapter that plugs into that 3.5 mm jack which would allow the signal to be sent as spdif. I think typically in this case it would be a digital coax. Can I use that for my output to send to my receiver? I always thought it was necessary to use a sound card with a laptop unless you have an HDMI output in which case you can use that AISOS (?) program to direct the signal. Otherwise can I just use the headphone output (analog)?

-Greg
angryht is offline  
post #7402 of 21672 Old 12-15-2013, 08:08 AM
AVS Forum Special Member
 
markus767's Avatar
 
Join Date: Apr 2009
Posts: 9,394
Mentioned: 78 Post(s)
Tagged: 0 Thread(s)
Quoted: 3656 Post(s)
Liked: 1304
^
Sure, you can use a headphone output.

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  
post #7403 of 21672 Old 12-15-2013, 08:14 AM
AVS Forum Special Member
 
angryht's Avatar
 
Join Date: Aug 2004
Location: Omaha, NE
Posts: 1,339
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Liked: 11
So, using the headphones output (just the stereo output) is acceptable now? I don't need a separate sound card? I am okay manually plugging the receiver output to whatever speakers I am testing (don't need the AISOS program). I just always thought I would need a separate soundcard if I didn't have HDMI output.

-Greg
angryht is offline  
post #7404 of 21672 Old 12-15-2013, 08:17 AM
AVS Forum Addicted Member
 
kbarnes701's Avatar
 
Join Date: Jan 2008
Location: Main Listening Positon
Posts: 26,416
Mentioned: 81 Post(s)
Tagged: 0 Thread(s)
Quoted: 6740 Post(s)
Liked: 5071
Quote:
Originally Posted by jim19611961 View Post

No posts today?

What a bunch of slackers biggrin.gif

 

I'm on a measurement break. As soon as I have installed the last tricorner traps (soon) and moved the position of my Height speakers to the side walls (per an idea of Sanjay's) I will be re-calibrating and re-measuring...

kbarnes701 is offline  
post #7405 of 21672 Old 12-15-2013, 08:19 AM
AVS Forum Special Member
 
angryht's Avatar
 
Join Date: Aug 2004
Location: Omaha, NE
Posts: 1,339
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Liked: 11
I just reread the first page of this thread and I think I got my answer confirmed (your answer as well).
Quote:
There are no other "black boxes" needed. You will NOT need a full duplex sound card because you aren't using the sound card's mic input and speaker/line output at the same time, as you'll be using the USB Mic. So the built-in sound card that every PC/Laptop has works fine. (Using it this way myself on a cheap laptop)
That's what I didn't realize. The USB mic allows this. I think I got it now.

-Greg
angryht is offline  
post #7406 of 21672 Old 12-15-2013, 08:37 AM
AVS Forum Special Member
 
angryht's Avatar
 
Join Date: Aug 2004
Location: Omaha, NE
Posts: 1,339
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Liked: 11
And just to clearly understand, as I get ready to purchase a usb mic, the prefered orientation of the mic during when testing is straight up and down. From the guide:
Quote:
The mic’s are provided with several calibration files, including a 90-degree calibration file, which is the angle used for REW measurements.
Is 90-degree straight up and down?

-Greg
angryht is offline  
post #7407 of 21672 Old 12-15-2013, 08:42 AM
Advanced Member
 
RickD1225's Avatar
 
Join Date: Sep 2009
Location: Phoenix
Posts: 763
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Liked: 68
I finally ordered a UMIK-1 from Cross Spectrum (also posted in the Klipsch thread). It is set for delivery on Tuesday. I plan to measure my current set up with a Hsu VTF-15H and then introduce my new dual DIY ST HT-18 D2 sealed subs (not quite finished yet, but should finish today, they are all sanded and primed) replacing the Hsu. I have a MiniDSP and an SMS-1 that I can use for sub EQ. With REW I think the MiniDSP will be a better device. Can't wait to see the results.

RickD1225 is offline  
post #7408 of 21672 Old 12-15-2013, 08:45 AM
AVS Forum Special Member
 
markus767's Avatar
 
Join Date: Apr 2009
Posts: 9,394
Mentioned: 78 Post(s)
Tagged: 0 Thread(s)
Quoted: 3656 Post(s)
Liked: 1304
Quote:
Originally Posted by angryht View Post

So, using the headphones output (just the stereo output) is acceptable now? I don't need a separate sound card? I am okay manually plugging the receiver output to whatever speakers I am testing (don't need the AISOS program). I just always thought I would need a separate soundcard if I didn't have HDMI output.

If your laptop has any kind of audio in/out then it has a sound card. Good read: http://www.hometheatershack.com/roomeq/wizardhelpv5/help_en-GB/html/gettingstarted.html#top

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  
post #7409 of 21672 Old 12-15-2013, 08:59 AM
AVS Forum Addicted Member
 
kbarnes701's Avatar
 
Join Date: Jan 2008
Location: Main Listening Positon
Posts: 26,416
Mentioned: 81 Post(s)
Tagged: 0 Thread(s)
Quoted: 6740 Post(s)
Liked: 5071
Quote:
Originally Posted by angryht View Post

And just to clearly understand, as I get ready to purchase a usb mic, the prefered orientation of the mic during when testing is straight up and down. From the guide:
Quote:
The mic’s are provided with several calibration files, including a 90-degree calibration file, which is the angle used for REW measurements.
Is 90-degree straight up and down?

 

Yes, pointing to the ceiling.

kbarnes701 is offline  
post #7410 of 21672 Old 12-15-2013, 09:03 AM
AVS Forum Special Member
 
angryht's Avatar
 
Join Date: Aug 2004
Location: Omaha, NE
Posts: 1,339
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Liked: 11
Got it. Thanks. Looks like CSL is out of the minidsp UMIK-1's. Is that one preferred or is the UMM-6 okay to use?

-Greg
angryht is offline  
Sponsored Links
Advertisement
 
Reply Audio Theory, Setup, and Chat

Tags
Dayton , Dayton Audio , Room Equilizer Wizard Rew

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


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