Some reflections are not necessarily problematic ?

[dieselb0y]

Once you find the boundary in question then you can determine if that reflection is problematic and should be treated. Some reflections are not necessarily problematic (e.g. the side walls) ( RealTraps - Room Measuring Series)

It was is the Envelope Time Curve (NM) section of the site http://www.realtraps.com/art_measuring.htm#4

Someone can explain me why The side walls are not necessarily problematic?

I was certain that the big reflection on my ETC graph cause by the side walls need to be treat....

[Gdupproductions]

Originally Posted by dieselb0y

Once you find the boundary in question then you can determine if that reflection is problematic and should be treated. Some reflections are not necessarily problematic (e.g. the side walls) ( RealTraps - Room Measuring Series)

It was is the Envelope Time Curve (NM) section of the site http://www.realtraps.com/art_measuring.htm#4

Someone can explain me why The side walls are not necessarily problematic?

I was certain that the big reflection on my ETC graph cause by the side walls need to be treat....

Lol they have to be treated.....i just hung a Cork board back to nail my papers to and now i realy hear no reflections from the right but more from the left wall. However sidewalls need to be treated as sound will reflect from there to your ears wich cause certain frequencys too bust a couple DBs wich will affect your mixing/mastering.

[Rod Gervais]

Lol, folks everything needs to be taken with the full picture in mind - and then placed in context.......

Ethan notes that all reflections are not necessarily problematic..... including reflections off side walls - this is not the same as saying that no side wall reflections are problematic...

In fact - in his section of the basics of room treatments he states this:

AVOID EARLY REFLECTIONS
Another common mixing problem is poor clarity and imaging caused by "early" reflections. Sound from the loudspeakers travels directly to your ears, but a few milliseconds later, reflections arrive after the sound bounces off the side walls and ceiling. This is known colloquially as "time smearing," though the more proper term is comb filtering. Comb filtering is a specific type of frequency response error that creates a series of peaks and dips. The cure for early reflections is absorber panels made of rigid fiberglass or acoustic foam, placed at specific points on the side walls and ceiling. Once these points have been treated, clarity and soundstage magically come to life.

Thus he is obviously pointing out (in the one you mention) that outside of mirrored reflections side wall reflections do not (necessarily) require treatments.....

He is of the belief (as am I) that too dead a room is not a good thing - although there are others whose design philosophies differ on this point.

It is very difficult to read one small section of anything written without misconstruing what's being said in it's entirety.

Rod

[dieselb0y]

Thanks all ..... hard for me to read in english sooo ... thats the reason why I need that confirmation ... thanks

[Gdupproductions]

Originally Posted by dieselb0y

Thanks all ..... hard for me to read in english sooo ... thats the reason why I need that confirmation ... thanks

Just make pretty thick reflection panels and place em between you and the speaker on the sidewalls. You'll hear your speakers will be more directly sounding to you. Way more direct to you then with out the panels.

[jonessy]

Perceptually speaking, not all reflections have the same effect.

The reflection's angle of incidence plays an important role, is its spectral contents is altered at different angles by the shape of the Pinna.

Whether a reflection is beneficial or problematic has more to do with the coincidence of this and the spectrum of the direct source.

As such, it depends on many other variables, such as the propagation delay time, loudspeaker directivity and programme material.

There are some very general guidelines as to which reflections are in most cases problematic and which are not. For a good review read the relevant chapter in Floyd Toole's book.

Cheers,
Jon

[Ethan Winer]

Originally Posted by Rod Gervais

Ethan notes that all reflections are not necessarily problematic..... including reflections off side walls - this is not the same as saying that no side wall reflections are problematic...

Exactly. I'll also point out that I didn't write that specific section of the article. Though that's no excuse and as the editor and co-author I should have clarified.

I just changed that sentence to:

"Some reflections are not necessarily problematic (e.g. side walls away from reflection points)...

--Ethan

________________
The Acoustic Treatment Experts

[cborg]

Originally Posted by jonessy

For a good review read the relevant chapter in Floyd Toole's book.

That's some really nice reading. Thanks Jon.

.christian

[Glenn Kuras]

Originally Posted by Ethan Winer

Exactly. I'll also point out that I didn't write that specific section of the article. Though that's no excuse and as the editor and co-author I should have clarified.

I just changed that sentence to:

"Some reflections are not necessarily problematic (e.g. side walls away from reflection points)...

--Ethan
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How about "Some reflections can be more problematic then others (e.g. side walls away from reflection points)...

[dieselb0y]

thanks all