Better Sound Through EQ: A Primer to Audyssey MultEQ Pro

gene

gene

Audioholics Master Chief
Administrator
Better Sound Through Active Room Correction: A Primer to Audyssey MultEQ Pro

<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><I style="mso-bidi-font-style: normal"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><A href="http://www.audioholics.com/techtips/specsformats/AudysseyProPrimer.php"><IMG style="WIDTH: 125px; HEIGHT: 93px" alt=[spks] hspace=10 src="http://www.audioholics.com/news/thumbs/spks_th.jpg" align=left vspace=5 border=0></A>Ultimate audio performance within the listening area starts with the loudspeakers and the room</SPAN></I><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">. How the Installer gets the loudspeaker system to integrate within the listening space is what can make or break even the best assembled audio systems.<SPAN style="mso-spacerun: yes"></SPAN>Patrick Hart discusses the important metrics of loudspeaker placement and selection, room acoustics, and how to best integrate all of these variables using the new Audyssey Pro MultEQ enabled processor for the ultimate theatrical experience in the comforts of your home.<SPAN style="mso-spacerun: yes"></SPAN><?xml:namespace prefix =></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">[Read the Audyssey Pro Primer]</SPAN></P>
 
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mtrycrafts

mtrycrafts

Seriously, I have no life.
Thanks:D

Yet another great article.:)
 

plhart

Audioholic
Gee Gene-

This is amazing. I write an extensive review which basically states if you want really realistic surround envelopment don't use ceiling speakers or high backed so called "home theater" seating and nothing. No comments. Does that mean everyone is in agreement?

How about two subwoofers minimum? That's an even bigger bottom line performance imperative.
 
O

oliverlim

Audiophyte
I think more and more are wising up to the multiple subs syndrome. But the work involved in getting phase and volume and placement right for multiple subs is a pain. Anything more then 2 subs does increase the difficulty in setting them all right exponentially.

As for high back seats, dun think it is mentioned much. But Most recliners of seats I have seen are only to the shoulders. And I am sure many who are concerned about sound quality will know that a seat back that covers the ears will mean less surround sound coming to it as well!

Really enjoyed your article. The main thing is that how do we actually get our hands on the unit? Audyssey has not been responsive and there are markets outside the US of A too you know :p

Oliver
 
N

Nick250

Audioholic Samurai
I mentioned this in another thread, call local audio system installers. They are business people, if they can order one and then sell it to you for a couple of hundred more than they paid, I think a lot of them would do it.

Nick
 

plhart

Audioholic
Nick250 said:
I mentioned this in another thread, call local audio system installers. They are business people, if they can order one and then sell it to you for a couple of hundred more than they paid, I think a lot of them would do it.

Nick
Since the Audyssey Sound Equalizer is a very specialized product it is sold only through one distributor in each US market. To my knowledge all A/V specialist installers who purchase from these distributors have to agree, within the general purchase agreement required by the distributor, to not transship or sell any of the purchased products on the internet. To do so could result in the A/V installer losing the ability to purchase any further products from that distributor.

In response to the Singapore-based Oliver Lim’s consumer request Audyssey’s Mike Thuresson set up and trained an Audyssey-Singapore distributor to take care of that particular consumer.

Patrick Hart
 
S

Sleestack

Senior Audioholic
About time for some DRC articles.

Why room correction technology is not and has not been one of the main topics on this site is beyond me given its overwhelming impact. Especially since it has been around in products for over a decade. Hopefully this becomes a more frequent topic and more solutions, including TACT, DEQx and the highly advance Accourate PC based solution, are examined and compared. Lyngdorf also has one that uses multiple measuring points.

I want to get my hands on one of those Sound Equalizers.
 
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We've probably pushed more articles than most... we're running out of things to write about to be honest. I think someone should submit some test results to us comparing various technologies... hint, hint... lol.
 

plhart

Audioholic
Sleestack said:
Lyngdorf also has one that uses multiple measuring points.

I want to get my hands on one of those Sound Equalizers.
Check out this book on Immersive Audio Signal Processing by two of Audyssey's co-founders. Or write to Chris Kyriakakis and ask if he can send the 11 articles he, Sunil and Phil have authored over the last few years on the math and thought processes which led to the Audyssey algorithms.

http://www.amazon.com/gp/product/customer-reviews/0387284532/ref=cm_cr_dp_pt/103-8913234-7281423?ie=UTF8&n=283155&s=books

In one of Chris' papers they describe how, with their very accurate measurement technology they are then able to mathematically synthesize another (I'm guessing here since the text says under 200) 180 points (which makes every 2 degrees) out from around the actual measurement point. Take eight measurements then and you've got ~1440 points to work with.

I'm guessing that, again because of the accuracy of their measurement system, that the multiple measurement points which are perpendicular to the source origin (i.e. a center channel speaker) will coorespond to the + or -30 degree listening window which has been documented by previous audio researchers (Toole, Olive and others before them) as the true width of a human's listening window.

Now, spread 8-10 or 12 measurements (of 180 points each) around a listening area and it starts to become more believeable that a system like Audyssey could indeed optimize a whole area. To my knowledge no other system, Tact included (because I've used it and I know how it operates), works on this principal.
 
S

Sleestack

Senior Audioholic
plhart said:
Check out this book on Immersive Audio Signal Processing by two of Audyssey's co-founders. Or write to Chris Kyriakakis and ask if he can send the 11 articles he, Sunil and Phil have authored over the last few years on the math and thought processes which led to the Audyssey algorithms.

http://www.amazon.com/gp/product/customer-reviews/0387284532/ref=cm_cr_dp_pt/103-8913234-7281423?ie=UTF8&n=283155&s=books

In one of Chris' papers they describe how, with their very accurate measurement technology they are then able to mathematically synthesize another (I'm guessing here since the text says under 200) 180 points (which makes every 2 degrees) out from around the actual measurement point. Take eight measurements then and you've got ~1440 points to work with.

I'm guessing that, again because of the accuracy of their measurement system, that the multiple measurement points which are perpendicular to the source origin (i.e. a center channel speaker) will coorespond to the + or -30 degree listening window which has been documented by previous audio researchers (Toole, Olive and others before them) as the true width of a human's listening window.

Now, spread 8-10 or 12 measurements (of 180 points each) around a listening area and it starts to become more believeable that a system like Audyssey could indeed optimize a whole area. To my knowledge no other system, Tact included (because I've used it and I know how it operates), works on this principal.
Because you read their paper they wrote you find it "more believeable that a system like Audyssey could indeed optimize a whole area." They also think they are the first company to use time domain corrections. I'm not saying it doesn't work better, but why make the assumption?

Also, you have used TACT systems but you posted this quote to support your position:

"In the case of the "target curve" and from my 35+ years of speaker design I believe that the Audyssey curve (which has never been exactly defined as it it part of their muli-patented system) is very, very similar to screen shot you show from your Tact system. The difference is the Audyssey guys can continue to "tweak" their curve for better performance based on information gleaned from feed back from installers."

Any TACT user know this is not true. It is overwhelmingly obvious if you have spent more than a minute with the TACT software. What TACT sytem did you use? A nonexistent one?
 
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S

Sleestack

Senior Audioholic
Clint DeBoer said:
We've probably pushed more articles than most... we're running out of things to write about to be honest. I think someone should submit some test results to us comparing various technologies... hint, hint... lol.
I gave up on trying to setup DEQx properly. I only had it for a week.

I plan on picking up the Sound Equalizer.

I'll post results of the TACT systems and the Sound Equalizer at multiple listening points as soon as I can get my hands on a Sound Equalizer. I can probably get the TACT results posted sooner.
 
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gurki

Audiophyte
Audyssey MultEQ Pro Sound Equalizer

in the future when room equalizetion gets better will there be Software Updates for this Model or will I have to buy new gear?
 

ronnie 1.8

Audioholic
What is s DRC? Digital room control (guess)?

After reading some of these threads (open and closed), my interest in having my av room corrected is quite high. I do have my DD12 professional installed/setup, and have some acoustic panels and a bass trap strategically positioned. Why have I not made efforts to utilize my AVRs EQ up to this point? Truly, because I don't have the slightest idea how I'd go about it. :confused:

Re: the Audyssey MultEQ Pro Sound Equalizer, this seems to be a component one must purchase, and ideally have setup/calibrated by a pro. Are there any tools such that a pro installer could visit my home system and correct my av room (in much the same way as my plasma would be calibrated)? I would assume all or part of this correction would be done via my Denon AVR3805's EQ? And of course, my wish is that these efforts could potentially yield significant improvements...
 

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