100 hz dip - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

Old 07-17-16, 05:14 PM
Senior Shackster
lesmor

Join Date: Dec 2009
Posts: 153
Re: 100 hz dip

Quote:
matthijs87 wrote: View Post
How is that a 1/4 wavelength cancellation ? woudnt 1/4th be 25 cm ? or maybe im missing the point , but from what i have read is that the sidewall length shoudnt be an equivalent of the length from the wall behind the speaker. so if im right, that would mean cancelations would be most probably at 25, 50 75 in my case or maybe i didnt understand this part well enough, im curious as well
395.4Hz = 87cm
395.4Hz/4 = 99Hz

or

speed of sound 344.5/87cm = 396 Hz /4=99 Hz
or
99Hz = 347.47cm /4 = 86.8cm

As I say I am a novice so could be looking at this completely wrong

Move the speaker and see if 100Hz changes.
Please let me know if it helps
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Old 07-17-16, 05:29 PM Thread Starter
Shackster
Matthijs

Join Date: Jul 2016
Location: Netherlands
Posts: 58
Re: 100 hz dip

Oh right, that makes sense, i dint looked at it at that way , thanks, will try that for sure.
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Old 07-18-16, 08:11 AM
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Bryan Pape

Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,283
Re: 100 hz dip

I would get the speakers closer to the front wall. I still don't know where your head is.

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

Bryan Pape

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Old 07-18-16, 05:48 PM Thread Starter
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Matthijs

Join Date: Jul 2016
Location: Netherlands
Posts: 58
Re: 100 hz dip

Oh im sorry i didnt get that, i thought you where refering to pointing up or pointing at the speakers. My head or mic posistion is 1 meter 50 from tweaters till head . I tried allot of diffrent things today, I found that changing the length to sidewall mostly just shifts the frequentie dip. Placing it more to the front wall did made a change and even some out around that area, gained 6,7 db there so thats great but still not perfect. The subb is a diffrent story tho, i had found one position where the sub and the 100 hz where pretty good but i could only get this to work in a direction where its not pointing to the center of the room. Is this useless information or can i do something with it ? obviously i cant make a working triangle this way.
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Old 07-19-16, 09:48 AM
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Bryan Pape

Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,283
Re: 100 hz dip

I need to know where your head is in relation to the wall, not the speakers. Don't worry about the sub not being pointed out into the room. Bass is omni-directional.

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

Bryan Pape

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Old 07-19-16, 03:24 PM Thread Starter
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Matthijs

Join Date: Jul 2016
Location: Netherlands
Posts: 58
Re: 100 hz dip

Ah okay, i posted this in my first post i think, its 2.05 from the front wall which is 36 % from the whole length of the room. I had read that this (1/3 till 38 %) would be the most ideal position for the listeing position to be in.
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Old 07-19-16, 03:48 PM
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Bryan Pape

Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,283
Re: 100 hz dip

Sorry - didn't remember that. Honestly I would try to get the monitors as close to the wall you are facing as possible and then set up in an equilateral triangle about 3.3 meters.

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

Bryan Pape

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Old 07-19-16, 04:33 PM Thread Starter
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Matthijs

Join Date: Jul 2016
Location: Netherlands
Posts: 58
Re: 100 hz dip

Thanks ! I will try that as soon as possible
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Old 07-20-16, 11:47 AM Thread Starter
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Matthijs

Join Date: Jul 2016
Location: Netherlands
Posts: 58
Re: 100 hz dip

its not possible that way , The width of my room is 3,50 besides that the foot of the stand also takes some space and theres also a wooden box that covers some gas pipes. the best i can get is (from tweeter to tweeter) 2.50 at an equilateral triangle. maybe a little bit more if i buy diffrent stands and cut som of that box away. but 3.30 is pretty much impossible.

If im not wrong this 3.30 would also be the minimum for it to work right ? it looks to me this settup is using the same principle as i aplied before only then backwards. like a third from the back wall in stead of the front, is that right?

I did some measurements annyway to see what it does. And it helps at the 100 but it creates some other problems as well.
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Old 07-20-16, 01:02 PM
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Bryan Pape

Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,283
Re: 100 hz dip

Get it the best you can and then treat the wall that you are facing with some panels that are 4-6" thick.

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

Bryan Pape

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