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post #1 of 15 Old 10-28-10, 06:41 AM Thread Starter
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TAKE a look, and...answer me

Hi all.....
i try to understand something but, this field is very hard so i need your help.
i'm testing my room and the first question, may be obvious....but needs an answer!

Which is the goal of the treatments? is it to obtain a 'flatter' response curve?
If yes, please take a look to the enclosed picture.

what about the "A circle"?
red graph is without any treatment and cyan and yellow are two different kind of panels.
keeping in mind that my goal is to obtain a flatter curve, i think i'm getting worse because
i'm increasing the "null" (the opposite of peak....i don't know the correct word")
is it a correct idea?

i think that the "B circle" represents an improvement, am i wrong?
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post #2 of 15 Old 10-28-10, 08:23 AM
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Re: TAKE a look, and...answer me

Sorry- not seeing an A or B circle in the graph. While you did introduce some issues around 150Hz. you got rid of the nasty one around 60Hz in the red trace with whatever you did in the blue/green trace. The 150Hz will likely be much easier to deal with.

Bryan

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post #3 of 15 Old 10-28-10, 08:51 AM Thread Starter
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Re: TAKE a look, and...answer me

sorry i did posting with the wrong picture.


red graph is the room without any kind of treatment


cyan : (front wall treatment)
1) one tube (40 cm diameter on the corner, 1mt hieght, density 100, thickness 4cm)
2) one big panel (width 60cm, height 2 meters, thickness 8cm rockwool, 2cm air) on the right of the speaker (outer)
3) one little panel (same thickness, 1 meter high)
2) one big panel in front of the column (do you remember the picture of my room?)



yellow : left wall treatment

1) little panel near the column
2) big panel at the centre
3) little panael near the corner,
4) one big tube on the corner (the same as before but 2 meters high)
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post #4 of 15 Old 10-28-10, 08:54 AM
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Re: TAKE a look, and...answer me

Evidently the tube is what's helping you though I'd be surprised if a single one actually did all of that around 60hz. Did you do all 3 of these measurements without moving the mic at all?

Bryan

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post #5 of 15 Old 10-28-10, 08:54 AM Thread Starter
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Re: TAKE a look, and...answer me

ooops the attachment
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post #6 of 15 Old 10-28-10, 08:56 AM
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Re: TAKE a look, and...answer me

It's hard to tell what the reference level would be to say if A is better or worse for cyan. Yellow trace isn't doing anything really well and is hurting some other things. Cyan trace is going in the right direction in several places.

I am serious... and don't call me Shirley.

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post #7 of 15 Old 10-28-10, 08:57 AM Thread Starter
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Re: TAKE a look, and...answer me

Quote:
bpape wrote: View Post
Evidently the tube is what's helping you though I'd be surprised if a single one actually did all of that around 60hz. Did you do all 3 of these measurements without moving the mic at all?

Bryan
Yes the mic is always at initial position

but what about panels?
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post #8 of 15 Old 10-28-10, 09:00 AM
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Re: TAKE a look, and...answer me

Can't tell - too many thing changing at the same time to say what is doing what.

My question was not if it was in the same place rather did you move it then move it back? Small changes in position can make large differences in response for an exercise like this.

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post #9 of 15 Old 10-28-10, 09:04 AM Thread Starter
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Re: TAKE a look, and...answer me

no, no, mic always in the same position.
i've a tripod ( the object we use with cameras....) and the position is perfecly steady.
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post #10 of 15 Old 10-28-10, 09:08 AM Thread Starter
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Re: TAKE a look, and...answer me

Talking about new issues introduced at 150Hz.......
is it a problem because we have "lost" that frequency?
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