The top red curve is what a phase response looks like when path length delay isn't accounted for. The scales on the y axis are a bit screwy, hard to make sense of the SPL measurements.
Very Good as I have been following this thread for quite some time!
I'm am glad to see that you have made much progress!
jer
I'm am glad to see that you have made much progress!
jer
Here is a quote from one person who auditioned Planot Prototypes in the summer of 2013.
"It was my pleasure recently to audition the Planot speaker Prototype 3 (P3) and also Prototype 4 (P4). These versions were the working prototypes for what will soon be the most refined and constructed iteration of the Planot.
I had a vague knowledge of the concept used to produce the sound but really could not imagine fully the set up or experience until the morning I entered the listening room. The sound stage and the ethereal experience of the first music piece consisting of avian sounds from a rain forest were stunning. The purity of the frequency range being tested was beyond any dome, cone, or diaphragm I've ever heard."
"Kudos to John Gaudreault and his vision for the Planot way of making sound as real as possible. He is on to something and we should all pay attention."
Respectfully,
Jeff McCabe
McCabe Fabrication
******
Audio Resume`
Jeff McCabe
Family Music History: From a family of musicians on my mother's side going back three generations. Players in bands and theater orchestras pre-talking films, collegiate marching bands, concert bands, light opera singers, piano teachers and recitalists, three virtuoso trumpet players, fiddle players and the great grandfather who was a violin maker. Father was a clarinet and oboe player in school and a music collector and audiophile from the 1950's to this day.
Personal Music History: Guitar player for 51 years. Trained in classical and flamenco for twelve years. Private guitar teacher for 10 years. Studied jazz in college and played rock, blues, bluegrass with local musicians and groups over the last 4 decades. Founding member of the “Lincoln Guitar Society” in the late 1960's.
Graduate studies in lutherie at WKU in Bowling Green KY. Built 15 guitars to date.
Electronics History: Took electronics in high school and built first Heathkit unit as a freshman. Continued to build kits, speakers, PA systems and install car audio through high school. Reintroduced electronics to the school curriculum where I was teaching in 1983 and taught analog and audio electronics for 25 years.
Began serious audiophile hobby in 1979 when I moved next door to a seasoned audiophile and equipment builder. Built numerous projects from scratch based on plans published in the issues of Glass Audio. Further modified the famous David Voorhies PAS 3 Dyna mod by adding massive outboard filtering and dual mono circuitry. Built lead lined plinths and bases for AR turntables. Have attended RMAF for 6 out of the last 8 years. Member of a local audio club since 1990
Didn't even mention my own recording studio and microphone collection. Nor the work I've done on the sound*boards/ control rooms*in two major recording studios in Omaha and the custom speaker stands for the top mastering lab in the region..... lots of stuff when it all gets put together.
Current Equipment in System 1: Pierre Lurne` Audiomeca J1 Turntable
Souther SL 3A linear tonearm
Sound Smith Modified Mayware Cartridge
Lawrence Smith modified PAC pro reference ll preamp
Urei 1122 transcription optional phono stage
Custom designed 6A5 stereo SET amp with Nobu Shushido front end
Proprietary flat annealed copper ribbon cable
Custom Designed furniture grade maple and cherry Altec A7's
with cantilevered horn flares internal wave guides populated with
NOS Altec 515's. Altec 500C crossovers with custom 1% RCA attenuators
feeding the Altec 805 tar filled horns with Kent Elliot hand tuned 288
drivers populated with NOS Altec (Hollywood era) Aluminum Diaphragms.
Constant delays and anecdotal claims do not inspire much confidence; nor does dodging serious questions about function and form
Have you ever attached a normal 1" fullrange driver voice coil to the rod (no rotation, just vibration)?
With the price of a custom-made rotating drive unit it is not interesting no matter how good it sounds. But if it was possible to get a panel-like performance with slimmer constructions that would be OK for low-cost lifestyle applications. The problem: the variety of shapes is infinite, so patenting is no use.
Hi planot, thanks for the response
its not exactly what I was looking for, it's you reporting what someone else heard
well, that means no member here auditioned the planot speaker yet in person and could report
its not exactly what I was looking for, it's you reporting what someone else heard
well, that means no member here auditioned the planot speaker yet in person and could report
Looks to me like rotating ripoles, therefore I am skeptical.
Not cause of a right angle, but because both lack a baffle.
It might measure flat down to 20 if you put the mic right
up against it, but acoustic short circuit around the thing
does not provide an obvious way for lower frequencies to
radiate into the far field...
I could be wrong. Just saying 25 pages later, its still not
obvious to me this thing has any hope without a crossover
to something else that doesn't suffer such a leak-around.
Since no crossover is one of the claimed advantages..
----
Anyways, trying to be helpful just in-case it does work.
Just cause I can't believe, don't mean it ain't possibe.
Has anyone investigated using piezos for twisting it?
Maybe 3 to 6 NXT voice coils in some sort of push-pull
arrangement around the points? Maybe drive the top
and the bottom in parallel?
Maybe move the rod up and down in a suspension system
that causes it to twist...
Since only the points radiate, and there's a leak-around
anyway, do we need the middle? Or can we just have
three rods with maybe some triangular toothpick truss...
Not cause of a right angle, but because both lack a baffle.
It might measure flat down to 20 if you put the mic right
up against it, but acoustic short circuit around the thing
does not provide an obvious way for lower frequencies to
radiate into the far field...
I could be wrong. Just saying 25 pages later, its still not
obvious to me this thing has any hope without a crossover
to something else that doesn't suffer such a leak-around.
Since no crossover is one of the claimed advantages..
----
Anyways, trying to be helpful just in-case it does work.
Just cause I can't believe, don't mean it ain't possibe.
Has anyone investigated using piezos for twisting it?
Maybe 3 to 6 NXT voice coils in some sort of push-pull
arrangement around the points? Maybe drive the top
and the bottom in parallel?
Maybe move the rod up and down in a suspension system
that causes it to twist...
Since only the points radiate, and there's a leak-around
anyway, do we need the middle? Or can we just have
three rods with maybe some triangular toothpick truss...
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Hi,
It doesn't work and never will. Glowing testimonials than
fly in the face of all known facts are the last refuge of
totally misprepresenting a product, very cynically
used over the years in America especially.
Testimonials (and similar subjective junk) are meaningless.
rgds, sreten.
It doesn't work and never will. Glowing testimonials than
fly in the face of all known facts are the last refuge of
totally misprepresenting a product, very cynically
used over the years in America especially.
Testimonials (and similar subjective junk) are meaningless.
rgds, sreten.
I think it might work. A thin-walled hollow structure is not vibrating like a string, so I think it is very well possible that the modal distribution meets the criteria for simple lifestyle products.
I will be holding public demonstrations.
I will post information here if you are interested.
At this point I have held private demos for at the most two people at a time because of the limits of my listening space and the difficulty of transporting my current prototypes to outside venues.
You can view and listen to a YouTube video of an early limited prototype by a physicist/computer scientist who was a member of this forum.
I will post information here if you are interested.
At this point I have held private demos for at the most two people at a time because of the limits of my listening space and the difficulty of transporting my current prototypes to outside venues.
You can view and listen to a YouTube video of an early limited prototype by a physicist/computer scientist who was a member of this forum.
The video tells nothing about its performance, it is easy to make a "Speaker" with a coil and a few magnets, just let your imagination free.....
Making something that perfoms (and measures right, if you want) is a totaly different story...........
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