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.
While you are taking a breather , 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.**************.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
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. :)
I would go for something like this though:
Just don't forget to wear your fiberglass boots.
"In science, contrary evidence causes one to question a theory. In religion, contrary evidence causes one to question the evidence." - Floyd Toole
Blue = without stool
Black = with
The difference is only 1 db, but still
(these are 200us smoothed responses. I like smoothing for comparisons. Makes subtle differences easier to see imo)
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
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.
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.
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.
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.
Here is the resulting bass response (no smoothing):
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.
I hope you like the new sound!
Thanks for sharing
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