Here's an ETC measurement I did before the big diffusor was completely finished. I expect the reflected energy to be a bit lower now than on this measurement.
An externally hosted image should be here but it was not working when we last tested it.
Here's a drawing showing the diffusor elements and the dividing walls
An externally hosted image should be here but it was not working when we last tested it.
Hi Stig,
Welcome to the linesource Fraternity. I have Full Range Apogee dipoles in our living room, and I have put a few Tall Ficus Benjamina trees behind the speakers to act as diffusers, and have thick drapes on the rear wall behind the listener for absorption of the first wave reflection. I want to put absorbers in the corners of the front wall but cannot in our home. This is the opposite room treatment from your room which has absorption on the front wall and diffusers on the rear wall. My guess is that you want the dipole effect to diminish as the frequency increases.
The Apogee philosophy I was taught: We do not want to significantly attenuate the rear wave of a dipole speaker because by killing off the rear wave with absorption we risk also removing much of the spaciousness and rich sound quality inherent in dipole designs. Diffusion on the front is used to breakup the sound wave and transform it into many smaller diffused waves without killing off the total energy of the original wave. Instead of one single reflected wave reversal, we try to create dozens of smaller wave reversals moving in wide angled departure from the reflection source. We would also like to see this diffusion occur over as broad a band of frequencies as possible.
Welcome to the linesource Fraternity. I have Full Range Apogee dipoles in our living room, and I have put a few Tall Ficus Benjamina trees behind the speakers to act as diffusers, and have thick drapes on the rear wall behind the listener for absorption of the first wave reflection. I want to put absorbers in the corners of the front wall but cannot in our home. This is the opposite room treatment from your room which has absorption on the front wall and diffusers on the rear wall. My guess is that you want the dipole effect to diminish as the frequency increases.
The Apogee philosophy I was taught: We do not want to significantly attenuate the rear wave of a dipole speaker because by killing off the rear wave with absorption we risk also removing much of the spaciousness and rich sound quality inherent in dipole designs. Diffusion on the front is used to breakup the sound wave and transform it into many smaller diffused waves without killing off the total energy of the original wave. Instead of one single reflected wave reversal, we try to create dozens of smaller wave reversals moving in wide angled departure from the reflection source. We would also like to see this diffusion occur over as broad a band of frequencies as possible.
This is an interesting point.
Basically at the mid to high frequencies he currently has a linesource but monopole acoustically since the rear wave is virtually eliminated in his room. Methinks reversing his setup would give the opposite of the "headphone" effect and more of the "live" or "your at the concert" sound, except now the rear of the room would have all the absorption which would act like a sound cloud making the rear of the room indiscernible in depth. I don't know if that would be a bad thing.
I think it also depends on what type of music you like to listen to and how you want it to sound, right?
Now the real question. Would StigErik try it and tell us what he thinks himself?
Edit: He is going to try it!!!
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Tonight is the first time I've had a chance to REALLY listen to what the big diffusor has done to my system. I must say I'm exceptionally satisfied with what I hear. Everything sound more like "nothing" - cleaner, more relaxed, better resolution, dynamics. I could use all the audiophile standard phrases over and over again. The most interesting is though that I hear things on recording that I never even knew was there - instruments deep down into the mix suddenly appeared, that I've never even heard was there! Whow!
(and its NOT due to the fact that I've had more than one glass of Laphroaigh 25 Y.O.)
(and its NOT due to the fact that I've had more than one glass of Laphroaigh 25 Y.O.)
You are truly my hero Stigerik! You know, there is a discussion going on over at the PartsExpress forum where some people are arguing that small room treatments aren't really necessary OR beneficial, backed up with some serious research from Toole and Sean Olive showing a preference for a more live room from both amateur and professional listeners. Guess you've been wasting your time.....NOT. I just don't understand the results of those studies. Every time I've ever treated a rooms first reflection points with some good, broadband panels, there has been nothing but an improvement in the clarity and soundstage. Their research shows not only a preference, BUT better intelligibility from the sound source also....confused for sure.
Greg
Greg
Great work again, Stig Erik, thanks for sharing !!!!
It could well be that its not you who does not understand - so, possibly its just them who do not *understand* !?!
My suggestion : never stop thinking the seemingly impossible - just check it out...
Michael
It could well be that its not you who does not understand - so, possibly its just them who do not *understand* !?!
My suggestion : never stop thinking the seemingly impossible - just check it out...
Michael
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Yeah, those are interesting results. Greg, do you have links?
More the latter; power spectral density's a weak function of genre.
Greg & Michael,
we should not take our own preferences as universal ones. Toole emphasizes that there are a lot of people who prefer involvement and envelopment to precision and clarity in music. Give your own wife or girl friend a fair chance to listen to both kinds - you will be surprised.
Studio people should have the ability and tools to control even the faintest detail in their recordings - but they should not expect each and everybody else to be of the same breed.
The research regarding better intelligibility has been in the context of better speech recognition in noisy environment - it is up to you to decide how relevant that is to the musical context ...
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