Audyssey MultEQ XT Digital Room Correction - Page 4 - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 24th February 2008, 12:06 AM   #31
diyAudio Member
 
ShinOBIWAN's Avatar
 
Join Date: Feb 2004
Location: UK
Default Re: idle speculation

Quote:
Originally posted by auplater
Seems to be alot of speculation about what "does or does not" sound good wrt room comp. and personal experience here.

Since the entire listening experience relies on more than just the compensating algorithmn... (i.e., the filters, delays, all the dsp)
that is, type of speaker(s) used, room characteristics, audio source, it's not inconceivable that minimal dsp (aka audyssey, etc.) might be all that's needed for an optimal setup.

hence, I don't necessarily buy the argument of "if you think [fill in your favorite dsp] is great, "things can only get better if you use [something better]".

Be interesting to hear some more real live listening experiences as well as the "expert" opinion about what should or should not occur (and be heard), especially comparison studies.

John L.
In a larger context, yes its idle speculation. Every case its unique so you can't really state EQ or no EQ is best but logically if your getting improvements with EQ in your room and system then the better methods of EQ will lead to further improvements. I also think you took my opening contribution to this thread a little too seriously. Those comments were meant to be light hearted, I guess that didn't come across despite the use of smilies.

There are some universals for digital correction. Too much is always worse than not at all. It has an upper limit of around 30% removal of problems in best case scenarios. The more transparent the processing the better. Aside from these the rest is dependant of other factors so your right, basic EQ might be all that's needed.

Despite the idea of basic EQ, the question still remains on overall transparency and flexibility. Audyssey is virtually non-tweakable, you have to rely on the wits of the software to achieve the desired and optimum effect - you know the answer to that one already.

I think tweaking, for all the reasons you state such as different rooms and speakers etc., is essential for the best and transparent results. For example one powerful tool in Acourate will let you adjust the width of the window the time domain signal is looked at. The width is given as a factor of cycles(ms) and the window is applied around the measured impulse peak. Smaller parameters for the width define a window which is more concentrated on the direct signal and larger values allow to take more and more room influences into account.
Acourate can also provide non linear window width over the frequency range ie. A larger window with low frequencies and interpolate to smaller for high ones. This gives the possibility to correct low frequencies but become more gentle as you move through the ranges.

What if you've got one speaker that's close to the wall and the other is out in the room? Well you can compensate for that by using differing amounts of correction for each channel and targeting only problem frequencies.

Another useful tuning tool are drawable target curves used to effectively shape the response curve at the listening position.

This is partly why I called Audyssey toy EQ. Its assumes it knows best about your listening room, speakers and habits. It doesn't have the first clue about those things so its of limited value IMO, its free of course so you can't expect too much. However given a tool such as Acourate you can bash a filter into shape that works the way you want it to sound in your room. Its like the difference between an interior designer coming into your home and decorating the place with what he considers good, and you picking through what you want and then having the professionals come in to apply whatever you've chosen.

The problem with Acourate is that its definitely more hands on and you need to identify what the problems are in order to effectively target them. In cases where the user has no interest in such things then set-and-forget EQ solutions such Audyssey will have to do. Things will get better with time though and programs such as Acourate will be considered the stuff of the dark ages.
__________________
The more you know who you are and what you want, the less things will ever be the same.
  Reply With Quote
Old 24th February 2008, 12:07 AM   #32
diyAudio Member
 
ShinOBIWAN's Avatar
 
Join Date: Feb 2004
Location: UK
Quote:
Originally posted by m0tion
Shin:

Curious, what convolution engine do you use? Convolver?
Yes.
__________________
The more you know who you are and what you want, the less things will ever be the same.
  Reply With Quote
Old 24th February 2008, 04:31 PM   #33
diyAudio Member
 
auplater's Avatar
 
Join Date: Apr 2005
Location: KyOhWVa tristate
Default eq. pics

here's some screen shots of the (admittedly lowtech) 1/3 octave corrections after swapping out the rear speakers with Advent 6003's

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

For what it's worth


John L.
__________________
"...His brain is squirming like a toad..." Jim Morrison
  Reply With Quote
Old 24th February 2008, 05:06 PM   #34
diyAudio Member
 
Robh3606's Avatar
 
Join Date: Nov 2002
Location: Destiny
Hello John

I have a question on the Audussey screen shots. I am reading them right?? Is that a 30db range with +10 0 -10 -20 shown??

What's the frequency scale??

Thanks Rob
  Reply With Quote
Old 24th February 2008, 05:25 PM   #35
diyAudio Member
 
auplater's Avatar
 
Join Date: Apr 2005
Location: KyOhWVa tristate
Quote:
Originally posted by Robh3606
Hello John

I have a question on the Audussey screen shots. I am reading them right?? Is that a 30db range with +10 0 -10 -20 shown??

What's the frequency scale??

Thanks Rob

yes, so far it's come up +10, - 20dB for the ordinate and 20 Hz - 20Khz for the abcissa as freq. range.

Sorry for the poor qual. scn shots. I'll try when less is going on aroiund here for better quality if anyone is interested.

There is a second calc. supplied called Audyssey flat that is quite a bit less pronounced in the corrections. I've got more work to do...

John L.
__________________
"...His brain is squirming like a toad..." Jim Morrison
  Reply With Quote
Old 24th February 2008, 05:36 PM   #36
diyAudio Member
 
wigginjs's Avatar
 
Join Date: Dec 2003
Location: Columbia, SC
Wow, I didn't realize it had a GUI. Thats neat. Just to clarify, the graph shown is of the correction filter, not the measured response of the speakers, right? How many positions did you measure from? What sort of measurement equipment did you use? I know that it probably comes with a pretty horrible mic, can you use an external mic/preamp?
__________________
The Four Chairs
DIY Home Theater
  Reply With Quote
Old 24th February 2008, 05:59 PM   #37
diyAudio Member
 
auplater's Avatar
 
Join Date: Apr 2005
Location: KyOhWVa tristate
Quote:
Originally posted by m0tion
Wow, I didn't realize it had a GUI. Thats neat. Just to clarify, the graph shown is of the correction filter, not the measured response of the speakers, right? How many positions did you measure from? What sort of measurement equipment did you use? I know that it probably comes with a pretty horrible mic, can you use an external mic/preamp?
Yes, it's a plot of the appled correction filter. As for the mic, I haven't gotten that far, but it presumably is calibrated to some std. (the somewhat cryptic manual says it's"calibrated", that's all.

Yes you can connect an external mic. here's the press stuff..

"Is the microphone calibrated?
Yes, the microphone is calibrated to a 1/4" industry-standard measurement microphone. The correction is applied to the measurements as they are being taken. It is important to use ONLY the designated microphone that comes with the product as the calibration curve built-in to the product is specific to that microphone. It is also critical to point the microphone upwards and to place it at ear height. Any other microphone will have different characteristics and thus will not produce the right results."

I measured 6 locations, in a roughly 15' arc ~ 15' from the main speakers. It's interesting listening to the gated chirp used while testing... it really highlites slap echo in the room...

btw: I'm using the side speakers in the teevee as the center channel... naybe why the results look so wild

Currently building 2 more side dipoles to reach 7.1 surround.

John L.
__________________
"...His brain is squirming like a toad..." Jim Morrison
  Reply With Quote
Old 24th February 2008, 07:10 PM   #38
diyAudio Member
 
Robh3606's Avatar
 
Join Date: Nov 2002
Location: Destiny
Thanks John

I have an Integra 9.8 preprocessor I just got set-up. I have not ran the Audessy yet. I was curious about the range of tuning on the + side. I have analog Urie 539 cut only EQ's in my HT set-up. It doesn't use much EQ and am very curious to see what kind of a curve Audussey comes up with.

I am sure that the intgrated version is not the same but I will keep an eye on the EQ curve. I am old school as far as adding + where room modes are and like to use as little EQ as possible. Kind of like the last resort.

Rob
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Free Digital Room Correction And PC based Xover kipman725 Multi-Way 3 7th August 2009 01:13 PM
Digital Room Correction and Foobar2000 Convolve mr.duck Digital Line Level 1 23rd June 2009 05:49 PM
DIY DSP for Digital Room Correction OzOnE_2k3 Digital Source 114 17th June 2008 09:25 PM
I need help with digital Room-correction Radian Multi-Way 1 7th February 2007 08:10 PM


New To Site? Need Help?

All times are GMT. The time now is 02:55 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2