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imispgh
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Perfect room shape

My new listening room is shaped like a barn with a flat top (or a Tough Shed). Using my RTA I can see it has far fewer problems than any rectangular room I have been in. (The room has 2 skylights on one side and is 19 X 12.5 X 8.5). I use a DSP to correct a hump at 60hz and a litle 3db help below 40hz and I show flat to 30hz. Could this be the best room shape? With there being 2 side walls and one angled in maybe it's hard to build standing waves?

ethanwiner
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Re: Perfect room shape

This looks very familiar.

So I'll answer you here rather than reply to the email you sent me earlier today.


Quote:
My new listening room is shaped like a barn with a flat top (or a Tough Shed). Using my RTA

What sort of RTA? Third octave response only? Or a pro type analyzer like the ETF or REW software programs?

> Could this be the best room shape? <

There's no such thing as a best size or shape. But yours is not bad at all, as confirmed by my Mode Calculator program:

www.realtraps.com/modecalc.htm

No matter what size or shape your room is, it still needs bass traps and first reflection control to realize its full potential.

But you knew I'd say that, right?

--Ethan

CECE
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Re: Perfect room shape

Are those things UL listed for flame spread smoke etc? Like pro stuff Sonex and others that are listed. Remember that dissaster in Rhode isalnd by using the wrong material...and yes it MATTERS!

ethanwiner
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Re: Perfect room shape


Quote:
Are those things UL listed for flame spread smoke etc?

What things? My company's products are all Class A fire rated. BTW, even the expensive foam products are not Class A rated. They still smoke and smolder and emit toxic fumes.

--Ethan

CECE
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Re: Perfect room shape

Sonex from illbruck is Class A Class 1 fire rating, probably the best stuff out there is Sonex stuff Illbruck pioneered a lot of the stuff. Way way back. Looks like falling back into the credential thang....I've been thinking of adding some stuff to fine to the enviorment....So far reading about Sonex, they seem to really have it well thought out....

CECE
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Re: Perfect room shape

I think you need to bone up on acoustic products, check the ratings ASTM fire ratings etc...some of this stuff doesn't ignite, I have to now start doubting your "comb filtering" issues, since you do not know what the competition is doing in acoustic products, especially fire ratings, ASTM, UL etc...CREDENTIALS matter..I guess ASTM doesn't matter either, like UL or any other testing organization? http://www.soundacoustics.com.au/willtecspecs.pdf

CECE
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Re: Perfect room shape
CECE
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Re: Perfect room shape
ethanwiner
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Re: Perfect room shape


Quote:
I have to now start doubting your "comb filtering" issues

LOL.

--Ethan

cyclebrain
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Re: Perfect room shape


Quote:
Using my RTA

What sort of RTA? Third octave response only? Or a pro type analyzer like the ETF or REW software programs?

> Could this be the best room shape? <

There's no such thing as a best size or shape. But yours is not bad at all, as confirmed by my Mode Calculator program:

www.realtraps.com/modecalc.htm

No matter what size or shape your room is, it still needs bass traps and first reflection control to realize its full potential.

But you knew I'd say that, right?

--Ethan

So if a 1/3 octave measurement is not accurate enough, what do you recomend as a good resolution? If one gets too narrow in resolution they will always have a response that is all over the place. Also an RTA will display frequency response but not reverberation times. An impulse measurement program like ETF though more complicated than a RTA program will show other shortcommings of your room.

ethanwiner
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Re: Perfect room shape


Quote:
So if a 1/3 octave measurement is not accurate enough, what do you recomend as a good resolution?


You really need to examine the response to 1 Hz resolution, at least for bass frequencies.


Quote:
If one gets too narrow in resolution they will always have a response that is all over the place.


Agreed, but at least then you're seeing the true response, versus a response that makes you feel good.


Quote:
Also an RTA will display frequency response but not reverberation times. An impulse measurement program like ETF though more complicated than a RTA program will show other shortcommings of your room.


Agreed 100 percent.

--Ethan

CECE
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Re: Perfect room shape
ethanwiner
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Re: Perfect room shape


Quote:
It's in the pro leauges now ain't it?


Now? I've been an audio professional since the 1970s.

My company's products are used by some of the most famous engineers and producers in the world including Bob Katz, Alan Silverman, Barry Gibb, NBC Universal Studios, yada yada brag brag ...

--Ethan

Elk
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Re: Perfect room shape

I've also seen your stuff at Sony's studios in LA.

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