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In Reply to: RE: I am looking for guidance in setting up my Tympanis posted by pictureguy on March 03, 2017 at 15:59:46
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Direct back reflection and standing waves. At least that's the idea.
In 35 years of owning panels, I've NEVER placed them Parallel to the front wall. Or any wall, for that matter.
Too much is never enough
You said: " Direct back reflection and standing waves. ".I think you are wrong about standing waves - they are generated irrespective of the angle of the bass panel as they depend on the dimensions of the room.
Re. 'back reflection' you could possibly be right - but you can't consider the back wave from the bass panels to simply go backwards, perpendicular to the panel. It in fact goes backwards - I would suggest - within a 90 quadrant ... ao the reflection off the front wall is on many angles.
And when I say " parallel to the front wall " - in fact my bass panel frames are probably 5 deg toed in. Whereas my mid/ribbon frames are 40-50 deg toed in.
Andy
Edits: 03/04/17 03/04/17
Never mentioned bass, which by general agreement is nearly omnidirectional. The frequencies of interest would be maybe 500hz on up.
The space between the panel and the wall form a cavity. It is of regular dimention and will reflect the sound right back at the panel.
Sure, it'll go all over. And it'll diminish or fade very quickly.
5 degree toe might be enough to break up a standing back wave. I don't know.
By actual measure, my panels are toed at 11 degrees.
I suspect that you could MEASURE such a phenom by comparing a panels impulse response in Free Air VS in a room. Limit response window to 5 to7 ms. Try different frequencies, too.
You might ALSO see such energy reflected back to the amplifier, but I don't know, other than a O-Scope how you'd measure that.
Too much is never enough
Of course if there are diffusors behind the Tympani panels, the panels alignment in relation to the wall behind them should not be that important---the rear wave will be scattered anyway, even if the panels are parallel to the wall. Right?
I suspect rather strongly that this should be TESTED by the means i proposed in another post.
Free air V parallel to wall V toe in. The frequency of standing wave between the wall and panel is related to the distance between 'em. The MOST intense reflection when parallel will be Right Back at the originating panel. Feed the panel various frequencies in a pulse and limit the time of reading to maybe 8 to 10 milliseconds.
I am using as my mental 'model' what happens to bass in a room. And having looked at the results from room mode calculators as well as reading up (and testing) ideas about sub placement.
Some setup helps when building an ALL NEW room advocate non-parallel surfaces for exactly the reason I mention. The ONE recording studio I was in made good use of non-parallel surfaces to randomize reflections and decrease the RT60 time. See Link:
I'm of the thought that INDEED diffusion is very important to panels. And that on the front wall directly behind the panel, the most important place of all. It will increase the 'virtual' distance TO said wall and that is almost always to the good.
Too much is never enough
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