100 hz dip - Page 6 - Home Theater Forum and Systems - HomeTheaterShack.com

Reply
 
Thread Tools
post #51 of 78 Old 11-11-16, 09:50 AM
HTS Senior Moderator
 
bpape's Avatar
Bryan Pape
 
Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,288
Send a message via AIM to bpape Send a message via Skype™ to bpape
Re: 100 hz dip

Yes. The panels are 2x4'. So put 2 side by side and it makes basically 4x4'.

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

Bryan Pape
Lead Acoustician/Owner
Sensible Sound Solutions
bpape is offline  
Sponsored Links
Advertisement
 
post #52 of 78 Old 11-11-16, 10:50 AM
HTS Senior Moderator
 
bpape's Avatar
Bryan Pape
 
Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,288
Send a message via AIM to bpape Send a message via Skype™ to bpape
Re: 100 hz dip

10" to do 100 Hz? Don't think so. 4" across a corner will go 60 ish easily.

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

Bryan Pape
Lead Acoustician/Owner
Sensible Sound Solutions
bpape is offline  
post #53 of 78 Old 11-11-16, 11:53 AM Thread Starter
Shackster
Matthijs
 
Join Date: Jul 2016
Location: Netherlands
Posts: 60
Re: 100 hz dip

Thank you for your comments,

I did use REW to get my frequency response as good as possible, that took quit some time before i found the right spot, i found only one position that worked for my frequency response, so as bpape recommended i looked for that and am now trying to fix the acoustics from this starting point. I guess that room simulation option would have done that job faster, but yea i found it manually, so no problem.

Yes to much isolation would sound to dull i can imagine that's why i am not isolating everything but just covering the direct and early reflection points. The grey stuff which is all over my ceiling is not actually doing very much, it may look like isolation but behind it is wood, so that might still compensate for the dullness and if its really needed i will ad some diffusers later on for sure but i first want my room to sound acoustically good.

I have read allot and seen allot of youtube vids about the subject but i am not sure anymore. I thought diffusers would be best for the more bigger rooms. My main concern now is to get the waterfall graph good. There is still to much going on in this room allot of high as well by ear, so i guess that will be taken care of with the panels i am making now. The sub and bass i am not sure about, i still don't know exactly how to read this waterfall exactly so i am putting my trust on bpape on that one.

i am using 6 inch for the corners so that's already 15 cm, that's pretty thick right ? and with the gap behind it it should do some extra isolation if i am right.

But i am a bit confused now, would diffusion be enough ? or should it then be a combination of the both ?. or can either do the job at its own way under certain circumstances ? See this is actual the same what you find on the internet if you look long enough, different opinions different arguments, different situations. I would like to do what is best for my room of course.
matthijs87 is offline  
 
post #54 of 78 Old 11-11-16, 12:04 PM
HTS Senior Moderator
 
bpape's Avatar
Bryan Pape
 
Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,288
Send a message via AIM to bpape Send a message via Skype™ to bpape
Re: 100 hz dip

Quote:
puukorva wrote: View Post
100hz has the wavelength of 135,6 inches. In order to effectively absorb sound with an absorbent material you need to have at least a quarter wavelength amount of the material. Soft absorbers fail at low frequencies, it's simple physics.
Theory vs testing.

http://www.gikacoustics.com/product/...ge-technology/

Standardized testing at Riverbank Labs.

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

Bryan Pape
Lead Acoustician/Owner
Sensible Sound Solutions
bpape is offline  
post #55 of 78 Old 11-11-16, 12:06 PM
HTS Senior Moderator
 
bpape's Avatar
Bryan Pape
 
Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,288
Send a message via AIM to bpape Send a message via Skype™ to bpape
Re: 100 hz dip

6" across the corner will do very well. Down into the high 40's.

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

Bryan Pape
Lead Acoustician/Owner
Sensible Sound Solutions
bpape is offline  
post #56 of 78 Old 11-11-16, 12:39 PM
HTS Senior Moderator
 
bpape's Avatar
Bryan Pape
 
Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,288
Send a message via AIM to bpape Send a message via Skype™ to bpape
Re: 100 hz dip

That's why you use an independent lab like Riverbank.

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

Bryan Pape
Lead Acoustician/Owner
Sensible Sound Solutions
bpape is offline  
post #57 of 78 Old 11-11-16, 12:53 PM Thread Starter
Shackster
Matthijs
 
Join Date: Jul 2016
Location: Netherlands
Posts: 60
Re: 100 hz dip

33 inch ? thats insane. I thought this gap is just needed to let it more effectivly bounce back into the absorbtion panels,
why should the gap then be a quarter ? and if this theory is right should you then not also measure the thickness of the panel within that calculation ? i mean if the gap should be 33 inch then the total is 39 inch thats indeed eating up allot of my room and not realy an option.

But what about the rear, front and ceiling ? would this be enough or better with diffusion ? is it situation dependend ? (size of the room/irragular shaped room ? and what is your point of view on this bpape ?
matthijs87 is offline  
post #58 of 78 Old 11-11-16, 12:54 PM
HTS Senior Moderator
 
bpape's Avatar
Bryan Pape
 
Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,288
Send a message via AIM to bpape Send a message via Skype™ to bpape
Re: 100 hz dip

Here is the actual test report and without the range limiter.

http://www.gikacoustics.com/wp-conte...ss-TrapNEW.pdf

Also, all of our panels can be ordered with or without the membrane.

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

Bryan Pape
Lead Acoustician/Owner
Sensible Sound Solutions
bpape is offline  
post #59 of 78 Old 11-11-16, 01:00 PM
HTS Senior Moderator
 
bpape's Avatar
Bryan Pape
 
Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,288
Send a message via AIM to bpape Send a message via Skype™ to bpape
Re: 100 hz dip

If you do the 33" all that does is create a hump in the absorption at that frequency. The gap is to get the leading edge farther from the hard surface. Generally the max you do is the same gap as the thickness of the absorber to keep things linear.

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

Bryan Pape
Lead Acoustician/Owner
Sensible Sound Solutions
bpape is offline  
post #60 of 78 Old 11-11-16, 01:39 PM Thread Starter
Shackster
Matthijs
 
Join Date: Jul 2016
Location: Netherlands
Posts: 60
Re: 100 hz dip

Quote:
bpape wrote: View Post
If you do the 33" all that does is create a hump in the absorption at that frequency. The gap is to get the leading edge farther from the hard surface. Generally the max you do is the same gap as the thickness of the absorber to keep things linear.
Yes that makes sense, changing the frequency response "drasticly" is not that much needed, how the room sounds is way more important.

So does this mean you where talking about two diffrent things ?altering frequency response vs acoustic response ?
matthijs87 is offline  
Reply

Bookmarks

Tags
100 , dip , hz

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome