Rt60 (Schroeder Frequency)

Nordo

New Member
Thread Starter
Joined
Oct 7, 2019
Messages
3
My AV System  
Preamp, Processor or Receiver
Denon AVR X1500H
Additional Amp
Sub amp - Behringer EP2500
Universal / Blu-ray / CD Player
Panasoic BD35
Front Speakers
DIY
Center Channel Speaker
DIY
Surround Speakers
DIY
Surround Back Speakers
DIY
Front Height Speakers
-
Rear Height Speakers
-
Subwoofers
Four 15" infinite baffle drivers
Other Speakers or Equipment
HTPC (windows 10 with Kodi)
Video Display Device
Epson EMP-TW2000 projector
Screen
Matt white "blockout" curtain liner
I have a very naive question regarding reading the Rt60 graphs.

I want to find the schroeder frequency for my well treated home theatre room.
I have attached the RT60 graph for my un-eq'ed sub, but I don't know how to read the RT60 time (or the shroeder frequency).
Can anyone please help?
RT60 - Sub Only.jpg
 

Nordo

New Member
Thread Starter
Joined
Oct 7, 2019
Messages
3
My AV System  
Preamp, Processor or Receiver
Denon AVR X1500H
Additional Amp
Sub amp - Behringer EP2500
Universal / Blu-ray / CD Player
Panasoic BD35
Front Speakers
DIY
Center Channel Speaker
DIY
Surround Speakers
DIY
Surround Back Speakers
DIY
Front Height Speakers
-
Rear Height Speakers
-
Subwoofers
Four 15" infinite baffle drivers
Other Speakers or Equipment
HTPC (windows 10 with Kodi)
Video Display Device
Epson EMP-TW2000 projector
Screen
Matt white "blockout" curtain liner
Thanks.;)
I've already read the REW help page, and that didn't help my layman's brain at all.
The amroc was interesting to use, but not sure how to allow for the amount of treatment I have.
Cheers
 
Last edited:

John Mulcahy

REW Author
Joined
Apr 3, 2017
Messages
2,131
The Schroeder frequency for a domestic-sized room will be around 200 Hz, it will be well above the sub's range unless you are in a stadium. RT60 isn't relevant at subwoofer frequencies in domestic rooms, look at the unsmoothed frequency response and the waterfall to see where the room's resonances lie and how well controlled they are. You can read more about the Schroeder (transition) frequency at https://www.soundandvision.com/content/schroeder-frequency-show-and-tell-part-1
 

Nordo

New Member
Thread Starter
Joined
Oct 7, 2019
Messages
3
My AV System  
Preamp, Processor or Receiver
Denon AVR X1500H
Additional Amp
Sub amp - Behringer EP2500
Universal / Blu-ray / CD Player
Panasoic BD35
Front Speakers
DIY
Center Channel Speaker
DIY
Surround Speakers
DIY
Surround Back Speakers
DIY
Front Height Speakers
-
Rear Height Speakers
-
Subwoofers
Four 15" infinite baffle drivers
Other Speakers or Equipment
HTPC (windows 10 with Kodi)
Video Display Device
Epson EMP-TW2000 projector
Screen
Matt white "blockout" curtain liner
Thanks John.
As my room is well treated, with multiple frequency absorbers at first reflection points, and bass traps across the rear wall and in the front corners, I had guessed my Rt60 was around 0.5 - 0.6 sec.
This gave me a Shroeder frequency of 160 - 180Hz. So according to you, my guestimate wasn't too bad.

What I am trying to do is find the frequency where the transition occurs so that I can limit Audyssey to below that frequency (using the MultEQ Editor).
As you said, I should adopt 200Hz and be done with it.

The link is a great article for a layperson like me. Thanks. :T

EDIT: John M - Just had another look at my sub's waterfall (below). With your advice, I can now see two large resonances that I'll need to EQ (using my DPS1124P).
Now that I'm starting to understand what to look for on some of these charts, I'm amazed how bad the resonances are at 20 and 30Hz when they don't look too bad on the basic SPL.
Thanks again for your amazing program (just made another donation.:jump: )
Waterfall-SubOnly.jpg
 
Last edited:
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