You couldn't be farther from the truth 🙄
Just try harder in your search. This should give you more information about their unique flow resistive damping of the rear openings.
I thought you were trying to reduce box colorations, not to enhance them. 😉
Rudolf
If you click on downloads there is a technical drawing which shows two vertical slots in the back whose dimensions are 435mm x 84mm either side of the amp pack.
I don't see how baffle step correction would in itself lead to a cardioid bass response.
hmmm... works for me now too. Some intermediate router myst have been down.
dave
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Rudolf - thanks ! - yes, this is much much better. Now it looks much more like I was thinking with the big ports behind the driver. I'm liking what I see here more and more. The only thing I noticed that I was a bit unsure of, the designer talks about slowing down the speed of sound with stuffing by special materials - something I thought MJK had already debunked. But then it also says there are some chambers inside to delay the back wave. Looks really interesting. Is it a kind of TL
It was a kind of counter example 😉
got it!
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Who agrees ? References of the current scientific literature !
Everyone knows ear low freq loudness bandwidth is even more coarse than 1/3 oct.
- Elias
I thought that would be obvious. But the problem to solve is more tricky. Read what Siegfried Linkwitz is writing about it.
Some more to read about the innards of a cardioid U frame from John Kreskovsky.
Rudolf
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always dangerous to make assumptions 😱
Seems to me the design is unnecessarily complicated in order that they could accommodate an integrated amplifier into what is essentially a U-frame. What would have been more interesting was if it was an attempt to remove boxiness from the mids. They created a 'cavity' behind their dipole mids, between the back of the mid-hi baffle and woofer. Time to move on....
I'm revisiting the Boffle, looking at it as a dipole with 'built in' room treatment behind it which looks as if would address colourations from box/room. There's not a lot of DIY examples about.
And I found something over on audio karma under the title baffle that looks like an attempt to create a structure to absorb the back wave - and it looks remarkably like the Zu speaker technology. I think I found this before but wasn't thinking about box colourations much at the time.
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Gareth,
I believe that Gary Pimm's speakers are essentially Boffles.
There are no images behing the icons you posted, can you point us to something we can read?
dave
I believe that Gary Pimm's speakers are essentially Boffles.
There are no images behing the icons you posted, can you point us to something we can read?
dave
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ooops !
go here: The Boffle - AudioKarma.org Home Audio Stereo Discussion Forums
post 9.
Didn't see anything at Gary's website that looked like a baffle ?
the closest I could find was "The basic test setup is a large infinite baffle (wall in my basement)"
go here: The Boffle - AudioKarma.org Home Audio Stereo Discussion Forums
post 9.
Didn't see anything at Gary's website that looked like a baffle ?
the closest I could find was "The basic test setup is a large infinite baffle (wall in my basement)"
I don't see anything at the AK thread that looks like a boffle (even the thing called the boffle)
http://p10hifi.net/tlinespeakers/forum/boffle-RadioElectronics.pdf
http://p10hifi.net/tlinespeakers/forum/Boffle-patent.pdf
Basically a U-frame with a heavily damped back-side
Gary doesn't seem to have any narrative on his speakers (my info is from Bud's & Chris' personal exposure)
dave
http://p10hifi.net/tlinespeakers/forum/boffle-RadioElectronics.pdf
http://p10hifi.net/tlinespeakers/forum/Boffle-patent.pdf
Basically a U-frame with a heavily damped back-side
Gary doesn't seem to have any narrative on his speakers (my info is from Bud's & Chris' personal exposure)
dave
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I wasn't saying there was, but the post in that thread, with the images that you couldn't see in my post, were claimed to be designed to reduce back wave coloration.
You must have tried this Boffle approach, seeing as you've probably tried most things in speaker kingdom! - what are your thoughts ?
I've only faked it up as yet. Appropriately damping the back of a regular box with the back removed. In most cases an improvemtn in quality with a reduction in quanity of bass.
Many things i haven't tried yet.
dave
Many things i haven't tried yet.
dave
Reading John Kreskovsky (Bless him...) is harder than reading Quantum Field Theory. Just my measley brain no doubt. 😀
A review of where we have got to is in order I think. A BOFFLE is a box with lots of felt pads with holes in them stacked along it seems. That looks rather good if the pads are held in place somehow.
Sorry, no open baffles there. We are talking box colouration, after all.
Do continue. 🙂
A review of where we have got to is in order I think. A BOFFLE is a box with lots of felt pads with holes in them stacked along it seems. That looks rather good if the pads are held in place somehow.
Sorry, no open baffles there. We are talking box colouration, after all.
Do continue. 🙂
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Note that what looks like a panel on the back should be another piece of damping and th ehole is not required.
Pimm is using Ultratouch witj good effect in his.
dave
Pimm is using Ultratouch witj good effect in his.
dave
Good Grief, a boffle works much like the Cochlear Canal in your ear. I didn't realise the canal has an output window as well as an input! 😎
How The Ear Works - With Pictures
I'd trust nature to evolve an efficient structure, albeit this is a microphone, but then that is the same principle. Next thing I'll figure out the vocal chords are a ribbon tweeter. 😀
How The Ear Works - With Pictures
I'd trust nature to evolve an efficient structure, albeit this is a microphone, but then that is the same principle. Next thing I'll figure out the vocal chords are a ribbon tweeter. 😀
