Even Jon Carroll himself don't know what is better - vented (bass-reflex) or transmission line (TL). He offers both vented (Caterhurn6 and 8) and TL (Dundee 5 and 6). Mr. Carroll has nothing new to give. "His" hard-won ideas are already described in books and papers published before he was born.
Not true. Everyone agreed that flat impedance is a good thing for a high (or moderate) output impedance amplifier. Insulting started as a result of describing it as something new.
We all found that way - it is called "damping".
By definition, pseudoscience is crap, not fun.
OK.
Can we start with the patent application for the "Acoustic Induction"? Patent applications are publicly available documents, but I can not find this one on the web. Mr. Carroll (copperweed), could you please post it?
No, you are missing a trick there. You can add mass loading too. Hence Isobarik and ABR bass designs. Tuned to taste.
Now, TBH, I get irritated at Patents which just describe a particular mathematical solution to the various filter equations. These seem just to embody the usual trade-offs, but unreasonably restrict people into paying royalties for various mechanical or electrical or waveguide solutions.
BTW, Joe Rasmussen's more interesting idea is even low-impedance transistor amplifiers like flat impedance. Something that works for me. 🙂
At a certain point, you feel that Jon Carroll, especially as a commercial designer, doesn't have to argue his corner any more. I wouldn't. I am generous enough to acknowledge greatness when I encounter it. See below. A beautifully enlightening simple explanation of room modes by Steen Duelund. Something the "gurus" of DIYAudio will never do. After all, they have to be "right" all the time.
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No, you are missing a fact that Jon Carroll doesn't use Isobaric or ABR bass design in any of his Alacrity Audio loudspeakers. Besides, Isobaric design can not "equalise the bass (approx 50Hz) Fs peak" on its own.
I detect a mean-spirited attitude in you here, Sonce. 😀
I recently listened to about a £100,000 worth of 5.1 home cinema, built by a rich enthusiast into a Steen Duelund type room.
These aren't the exact 6" scanspeak or RAAL ribbon drivers, but driven by a LR4 24dB/octave digital filter. Along with 15" bass units built similarly into the wall. Most of my efforts are puny and restricted by comparison.
We love this art, but it is bound by the laws of Physics. Whatever you do is detectable.
I recently listened to about a £100,000 worth of 5.1 home cinema, built by a rich enthusiast into a Steen Duelund type room.
These aren't the exact 6" scanspeak or RAAL ribbon drivers, but driven by a LR4 24dB/octave digital filter. Along with 15" bass units built similarly into the wall. Most of my efforts are puny and restricted by comparison.
We love this art, but it is bound by the laws of Physics. Whatever you do is detectable.
Steve, I'd question the relevance of Steen's diagram there. I know from my own mistakes the folly of embracing concepts, and 'good looking geometry', without considering the band of an effect, the size of sound, or the effect of one influence being much larger than another competing effect.
A comprehensible statement would be welcomed, along with a copy of the patent application 🙂.
Pseudoscience is pseudoscience. Whether the reader is upset by it or finds it funny is down to the reader. In this case the attempt to pull the wool over people's eyes is sufficiently inept it is hard to take much offense particularly given the chap is prepared to engage in discussion.
When not overly bright people pay an excessive amount of money for a couple of drivers in a wooden box that are not even flush mounted they will almost certainly be buying into a fairy story. Since what is being bought and sold is purely a luxury product that seems fair enough to me if both parties are happy.
andy19191, I agree with you. Indeed I was upset. If I offended someone, I am apologizing.
Now, shall we try to find in what way Alacrity Audio loudspeakers are different inside from conventional TL or vented boxes?
Still waiting for the "Acoustic Inductor" patent...
Now, shall we try to find in what way Alacrity Audio loudspeakers are different inside from conventional TL or vented boxes?
Still waiting for the "Acoustic Inductor" patent...
Once I heard the GURU speakers and both the Dundees 5 and the gurus are jaw dropping... Before calling it pseudo_something try it for yourself or put your hands in some realistic measurements. They usually look good and there is a reason.
Can you provide links to these realistic good looking measurements?
Pseudoscience means the story told to help market the speakers is not based on accepted science but is dressed up to look as if it is for those with a weak scientific knowledge. The speakers themselves may good, bad or indifferent.
They can sound good and the method can still be pseudoscience or even an outright lie.
I've heard the GURU (after a half hour spiel about how great they are). They don't break (or create) any laws of nature. CRAZY expensive, something like $3k/pair, and people claim Bose is all about marketing....
SoundStage! Measurements - Guru Pro Audio QM10 Loudspeakers (8/2008)
Looks rather like a speaker designed using cookbook formulas and tuned by ear with no baffle step correction.
I've heard the GURU (after a half hour spiel about how great they are). They don't break (or create) any laws of nature. CRAZY expensive, something like $3k/pair, and people claim Bose is all about marketing....
SoundStage! Measurements - Guru Pro Audio QM10 Loudspeakers (8/2008)
Looks rather like a speaker designed using cookbook formulas and tuned by ear with no baffle step correction.
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Since he joined the discussion pretending to be just a regular member rather than admitting he is the manufacturer straightaway makes me doubt that we will ever get clear info from him and that there is nothing special about his product beyond his marketing spiel.
They might be decent speakers but given his behaviour here I don't really care anymore. He is no Tom Danley that's for sure.
Yep. The whole thing reeked even before that reveal. Most of the spectrum of bass loading has been done and done to death, whether (dishonestly) marketed or not.
It's there a patent or not?!
If I was Jonathan I would not bother anyway to prove anything anymore... after such "kindness" from other members I would refrain from posting anything new even if I was right. I do not blame him, only if I knew he was a con artist (100% sure).
The only thing (US/UK patents) that comes close, to my mind and not Jonathan's patent of course, is a few materials and techniques e.g. B&W Matrix enclosure and it's "tapered tube loadings" models,
Patent US4690244 - Loudspeaker enclosures - Google Patents
Patent US5261006 - Loudspeaker system comprising a helmholtz resonator coupled to an acoustic tube - Google Patents
Reflex Tapered Tube Loading
Loudspeakers on Damped Pipes - G. L. Augspurger (on behavior of damping materials and more...)
http://diyaudioprojects.com/Technical/Papers/Loudspeakers-on-Damped-Pipes.pdf
UK Patents are difficult to find and what seems they are not available (researchable or indexed).
What it's said in the previous posts are in full contrast to what was published here (below) by his friend.
(patent number, link or real reference?)
If I was Jonathan I would not bother anyway to prove anything anymore... after such "kindness" from other members I would refrain from posting anything new even if I was right. I do not blame him, only if I knew he was a con artist (100% sure).
The only thing (US/UK patents) that comes close, to my mind and not Jonathan's patent of course, is a few materials and techniques e.g. B&W Matrix enclosure and it's "tapered tube loadings" models,
Patent US4690244 - Loudspeaker enclosures - Google Patents
Patent US5261006 - Loudspeaker system comprising a helmholtz resonator coupled to an acoustic tube - Google Patents
Reflex Tapered Tube Loading
Loudspeakers on Damped Pipes - G. L. Augspurger (on behavior of damping materials and more...)
http://diyaudioprojects.com/Technical/Papers/Loudspeakers-on-Damped-Pipes.pdf
UK Patents are difficult to find and what seems they are not available (researchable or indexed).
What it's said in the previous posts are in full contrast to what was published here (below) by his friend.
By the way, in the next paragraph, it also says and I leave it to anyone to decipher!!!
(patent number, link or real reference?)
Someone said "the problem with things you don't know is that you have no way to know the depth of your ignorance."😎
Why might a friend writing marketing bumpf fail to identify themselves? Isn't the identity of the author an important, perhaps essential, part of a testimonial? It doesn't trigger any doubts given you know that Mr Alacrity has already been caught out pretending to be somebody else in this thread and seemed quite unabashed about it.
I guess we have all developed different ways of trying to work out what looks likely to be true and what doesn't given the vast amount of lies and misinformation we are continually bombarded with in our daily lives. Interesting stuff.
uk patent search works fairly well. I just checked and I can find my filings. So
That 'company history by Dave' has one worrying sentence in
That's 5 pairs of speakers a year on average...
That 'company history by Dave' has one worrying sentence in
That's 5 pairs of speakers a year on average...
Did you find anything. There isn't any number or anything...
5 pairs is fairlly good (considering the fact of someone that was very sick and probably coldn't move or stand). What bothers me is the constant name changing. ..."White Speakers" hummmm!!!! Who would think of that?! 😀
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