Using Waterfall and ETC Graphs to analyze room response - Page 6 - AVS Forum
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post #151 of 162 Old 10-16-2012, 06:06 PM
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Quote:
Originally Posted by Tubamark View Post

Those "audiophile" chairs with a leather headrest should be complete nonsense to even the most casual audiophile. Leather is highly reflective. Too many audiophiles hear with their eyes, not ears.

-- Mark

I once had a high back leather chair. While it was very comfortable, I noticed that I got a reflection 2-3 inches behind my ear. In time, I did away with the chair. I am not sure I would tag such a chair as an audiophile favorite, but I would agree that such a chair shouldnt be the "sweet spot" prime listening chair. I am not even sure I put that kind of chair in my prime listening room at all.

Aesthetics, comfort and convenience often times win out over theory and common sense. Audiophiles are certainly no more immune to it than your casual listener.

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post #152 of 162 Old 10-17-2012, 08:03 AM
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Hi. I just wanted to say thanks for the amazing details provided in this thread. It's been a great read.
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post #153 of 162 Old 10-17-2012, 11:57 AM
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Quote:
Originally Posted by amirm View Post

While you are taking a breather smile.gif, you may want to read this article I wrote on perceptual aspects of room reflections. It was published in Widescreen Review magazine and it has finally been out long enough in print that I went ahead and put it online: http://www.madronadigital.com/Library/RoomReflections.html.

What I liked best in the article was:

Time responses can look the same and sound different.
Frequency responses can look the same and sound different.


Its easy to get so into the data one can forget its place. Thanks for the reminder smile.gif

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post #154 of 162 Old 10-20-2012, 06:20 AM - Thread Starter
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@Mark:

 

After considerable searching, I have found and procured an appropriate audiophile listening chair.  Not only does it eliminate the unwanted reflections from those high backs, it also prevents me from falling asleep after the third or fourth song, like I used to.  :)

 

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post #155 of 162 Old 10-20-2012, 06:54 AM
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This is what I use

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post #156 of 162 Old 10-20-2012, 07:07 AM
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Not bad Jerry but the ultimate audiophool chair is this - of course only without the "pillow":



Alternative:



I would go for something like this though:



Just don't forget to wear your fiberglass boots.

Markus

"In science, contrary evidence causes one to question a theory. In religion, contrary evidence causes one to question the evidence." - Floyd Toole
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post #157 of 162 Old 10-20-2012, 09:38 AM
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Believe it or not, a footstool actually helped my ETC in that it partially blocks a floor bounce around 2 ms

Blue = without stool
Black = with

The difference is only 1 db, but still smile.gif



(these are 200us smoothed responses. I like smoothing for comparisons. Makes subtle differences easier to see imo)

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post #158 of 162 Old 10-20-2012, 10:43 AM
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Quote:
Originally Posted by markus767 View Post

Not bad Jerry but the ultimate audiophool chair is this - of course only without the "pillow":

Alternative:

I would go for something like this though:

Just don't forget to wear your fiberglass boots.

Depending on room reflection specifics, a chair that fills around you up to perhaps shoulder height and around the bottom of you like the red chair might be preferred. Floor bounces and some rear reflections in close proximity around the listener may be deflected elsewhere or absorbed, where something completely open on all sides and downward wont. Obviously, such a chair shouldnt be made of reflective material wink.gif

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post #159 of 162 Old 11-01-2012, 08:27 AM - Thread Starter
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It has been a while since I provided an update to this thread.  Since my last post, I have researched several companies who provide room treatment products, looking at absorption data, form factor, etc.  As I have reported earlier, even though I have received strong encouragement from several contributors to consider DIY treatments, I opted to purchase a manufactured product.

 

The treatments I have selected (and now installed) are typical 2’x4’ velocity panels, with 4 inches of actual absorption material and a 2 inch air space between the material and the wall.  The manufacturer calls these panels “bass traps”, although they don’t do much below 80 Hz.

 

81500

 

 

I installed two panels on the back wall behind the MLP (the wall is only 48 inches wide) in an attempt to tame the most troublesome reflections.  I installed two more panels in the rear corner to assist in bass response.  I now have a total of eight 2’x4’ “bass traps”, the four new panels, plus four RealTraps MiniTraps in the front two corners.  There is not much more room for bass traps in my listening room.

 

 

700

 

700

 

 

Here is the impulse response before the four new panels.  My objective was to get the reflections at 4.5m (-11dB), 6.3m (-10.5db), and 11.3m (-15dB) to where all were under 20dB.

700

Here is the impulse response after the new panels were installed.  The primary reflection from the back wall at 6.3m is now -30dB, which is better.  The remaining reflections are pretty close to -20dB, so overall the results are not too bad.

  

700

Here is the resulting bass response (no smoothing):

700

700

 

700

 

 

Bass response improvement is marginal, but to my ears the bass sounds pretty good.

 

So, I plan on taking a break from room treatments for a while and allowing my ears to become accustomed to these changes.  I have gained a fair bit of knowledge with respect to generating and analyzing impulse response graphs and waterfalls, and learned to appreciate how well R-30 works!  My thanks to all the contributors who have helped me in this interesting project.

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post #160 of 162 Old 11-01-2012, 11:46 AM
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Thanks very much for posting the follow-up and being so careful with your documentation - it's very informative!

I hope you like the new sound!
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post #161 of 162 Old 11-02-2012, 05:43 AM
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I agree, thanks for the documented, prudent approach.

Thanks for sharing

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post #162 of 162 Old 11-02-2012, 03:05 PM
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I am glad your happy with things smile.gif

Your welcome to stop by if/when you are inclined for a road trip (2.5 hours).

Cheers

My Room
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My Equipment

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Rega - DAC
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