AudioCircle
Audio/Video Gear and Systems => Single Driver, Wide-Bandwidth Speakers => Topic started by: avahifi on 10 Jul 2015, 01:53 pm
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They appear to work by twisting a long thin triangular shaped pole driven by a linear motor similar to that used by a hard drive head motor but beefier.
Looks like an interesting concept. Single driver, no cabinet, no back wave. I wonder if it works well.
Frank Van Alstine
http://www.planotspeaker.com/Planot/It_Works.html
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That's very interesting. Thanks for sharing!
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The triangular piece doesn't twist, it rotates.
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I dont see any motion, looks its a vibrator:
https://www.youtube.com/watch?v=ZeGtdKoxk20
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Sounds kinda tinny on my iPad. :lol:
Sorry. I couldn't help myself. All my music sounds much better through my 400R. :thumb:
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To made bass it will need a big tube.
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I read about these at least 5 years ago.
Intriguing design and concept.
But where are the real world applications? If they are so good, why haven't there been any commercial products?
Why doesn't the site have any specs (at least that I could find)?
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Looks less impressive than NXT, which is useless to hi-fi due low sensitivity.
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I am the inventor of the Planot speaker.
I would be glad to answer any questions.
First off the diaphragm does not rotate or twist; it pivots along its long axis. There are bearings at the top and bottom of the diaphragm. At the bottom is my proprietary dual voice coil motor that is driven by the audio signal.
(http://www.audiocircle.com/image.php?id=124630)
The graphic shows the phase and frequency response measured in my listening room. The measurements were taken using REW software, a Roland USB mic preamp and a calibrated measurement microphone. This is a measurement using the old version of the motor for my prototype 4 (P4). The same graph can be seen in two places on my Web site.
John
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Welcome, and thanks for posting John. :thumb:
So where in the US can I hear these?
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Only in Omaha, Nebraska currently. They are not a commercial product yet. If you are a manufacturer or a SEC certified investor you can audition them here. I have been invited by Constantine Soo, publisher of Dagogo, to give a demo and talk at the California Audio Show. Unfortunately I will not be able to attend this year. I have other pending invitations.
This brings me to what is an extremely important question for me.
If you had to pick one of these four options, which do you think would have the greatest and fastest impact on public opinion; please help me by rating them 1 is best, and 4 is least desirable. (#3 would include post reviews by attendees.)
1) a single public demo and talk in Omaha,
2) a video presentation on You Tube,
3) a live stream , over Meerkat, of a demo to a group of audiophiles (picked from amoung people who applied online to attend).
4) publish a group of measurements taken in an anechoic chamber by Indy Acoustic Research.
http://www.indyacousticresearch.com
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As an audio consumer, the only option which would interest me would be the live event, and hope that someone there writes up a decent review of the sound with comparisions to other well regarded speakers (box, open baffle, and planar). Of course, it would be even better if you did it in Atlanta and I were invited :thumb: :lol:
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Any more questions?
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Its hi sensitivity to run small tube amps?
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I use a 60 watt per channel solid state power amplifier. Part of the equation is the preamplifier.
I am using an AVA preamp; in the past I also had a highly modified DH-101 driving the same power amp and that drove the prototype to significantly higher levels using the same power amp.
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I have not used a tube amp to drive any of my prototypes. (I have owned a number of tube power amps in the past.)
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Remember I am still using prototypes. Highly engineered drivers motors should have significantly improved efficiency. I believe the limiting factor is the motor, or as I like to say the potor(tm) as in pivoting-motor; to emphasis that it pivots and does NOT rotate.
John
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Planot,
When I wrote 'rotate' I should have added back and forth. I certainly did not imply that the speaker operated like a turntable. I simply meant that it pivots on its longitude axis. Sorry for any confusion.
Since you can't attend the California Audio Show personally, why not entrust a prototype to Dagogo to demo at the show? You need publicity or your design will not have enough demand to attract investors.
steve
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Thanks John for the reply.
Wish you best of luck.
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Planot,
Since you can't attend the California Audio Show personally, why not entrust a prototype to Dagogo to demo at the show? You need publicity or your design will not have enough demand to attract investors.
steve
Steve:
The prototypes are more "laboratory instruments" rather than boxes you can throw in the trunk.
I would not dream of asking Mr. Soo to do my work. But soon enough.
I am leaning towards doing a streaming demo for a room of audiophiles locally. I include a discussion after the demo. I would ask the attendees to fill out a questionnaire afterwards and I would post the results on my Web site. Remember this would be a live stream you could see and hear the responses live. Obviously you guys , the audience, could not judge the audio over the stream but you could get the response in real time. I could try to select an audiophile who lives nearby and is an active member of this and a couple of other forums.
Any ideas? Yes or no. I believe that would be the least expensive way for me to reach the largest audience with the most credible presentation.
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If you do decide on a live streaming demo (I recommend this) then please let me know when it will be held.
If it is at all possible, I would like to attend and would be happy to bring some more modern audio electronics to use and bring a small but excellent set of speakers to compare yours with if desired.
Minnesota to Omaha isn't all that far.
Regards,
Frank Van Alstine
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If you do decide on a live streaming demo (I recommend this) then please let me know when it will be held.
If it is at all possible, I would like to attend and would be happy to bring some more modern audio electronics to use and bring a small but excellent set of speakers to compare yours with if desired.
Minnesota to Omaha isn't all that far.
Regards,
Frank Van Alstine
Frank:
Absolutely. We'll talk, I have your number.
John
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John,
Welcome to the Circle. :wave:
I think the live stream idea is very good especially if it also eventually finds its way onto YouTube.
I also think a great idea would be to give a demo at a major show. Then you get buzz from attendees who will post on multiple forums. Hopefully your demo will be something worthwhile and the press will pick up on it and spread the word.
I think the show route is your best bet because it automatically gives you broader coverage online and more credibility if many audiophiles give it thumbs up. If you do a live stream or YouTube you have to get the word out somehow and it is only gets the respect of an "infomercial".
Bummer about the California Audio Show. I will be there and would love to hear something truly new.
Good luck,
Don
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Thanks, Don. Good advice.
John
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If you do a live stream or YouTube you have to get the word out somehow and it is only gets the respect of an "infomercial".
The live stream event will feature participants who will gain nothing from the event. The participants' reasonable expectations should be that if they are dishonest in their opinions, wether negative or positive, that it will harm their reputation.
I am the only one that I expect to gain from any positive publicity. I have no expectation that participants at the demo are going to be totally positive or negative about the performance of the Planot driver. My prototypes are, and always have been, proof-of-concept implementations. My hope is that everyone will agree that they point towards a greater enjoyment of the arts.
All I hope for is an intelligent and informed discussion and a positive appreciation of what I have achieved, so far. When my patent is commercialized, my reasonable expectation is that "MY implementation of the concept" will be vastly improved upon. This is just the beginning; I am advancing the science of sound reproduction.
John
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I think the concept is very interesting and worth looking into. I'm not a potential manufacturer, but if I were in your shoes, the audience I would look for is companies that are already in the business of manufacturing loudspeaker drive units. The link below is a list as such.
http://www.helarc.com/linksdrivers.html (http://www.helarc.com/linksdrivers.html)
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Question - what are the design challenges and limitations you have encountered so far.
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Sooo... does it sound like anything?
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My advice is to get positive word of mouth. Have people post their listening impressions on the big audio related boards. I suspect that will trigger a request for a review sample.
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Sooo... does it sound like anything?
I am not an audiophile that has seriously auditioned scores and scores of different speakers. But, that said I believe that it is sometimes easier to compare the performance of speakers against an known quantity such as a reference speaker that you have carefully compared to real sound. But, no, sorry I can not compare it to any speaker you are probably familiar with. I have a 3-way Essence system. Each driver is transmission loaded. The tweeter and super tweeter each have their own concrete enclosures. Each of the three enclosures can be "physically time aligned." The enclosure clusters have minimum diffraction fronts. The crossovers are single pole using Wonder Caps and 1% resisters. They use a combination of Audax and Morel drivers.
These are my personal reference. I am not a musician but I was the stage manager and audio visual expert for a museum concert hall for 10 1/2 years. The concert hall hosted a great number of mainly classical music concerts but also some jazz. I developed my ear in parallel with my interest in audiophile equipment. I was responsible for sound reinforcement and recording, etc. I have acute and sensitive hearing with and extremely, almost pathological, hatred of high frequency distortion.
I would like to do some live vrs live played through Planots.
John
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You could just say it sounds nice, but you don't know how nice... or it needs some work. I mean, does it sound like another pair of speakers?
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John,
Welcome to AC your design is different for sure. Are there limits as to room size and placement of your speakers?
Chris
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John,
Welcome to AC your design is different for sure. Are there limits as to room size and placement of your speakers?
Chris
Chris:
There is a limit to the output of my current prototypes; small listening rooms.
I believe my design is limited only by the motor and by the total surface area of the diaphragm(s).
What are the limits of cone shaped diaphragms?
John
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You could just say it sounds nice, but you don't know how nice... or it needs some work. I mean, does it sound like another pair of speakers?
Sorry but I have no better answer to your question. I may in the future but I don't have one now.
If I tell you what others have said of the performance of the Planot I guarantee you will not believe me.
I prefer to have others speak for my invention. I have provided measurements and measurement parameters and no one believes me. This is why I want to find the correct research lab to certify and quantity the performance. I am talking to Indy Acoustic Research to do the measurements.
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Some people, especially engineers, prefer to measure speaker performance while other people want to hear speaker performance. Some people will only believe their ears and some people will only believe numbers. The truth is independat of both until such time that we have the ability to describe the experience of hearing numerically. That may only happen if we can quantify the experience through noninvasive brain scanning. Unfortunately or not many outside factors are involved in the way we process sound. There is not a direct 1:1 correspondence between the phenomena of sound and our experience of it. But if we work together we can close the gap. Speakers are the window on the solution.
John
I can't post anymore until next week but please keep questioning. I'll check back and I hope I can answer all your questions.
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Please follow the link below to vote for Planot for the Create the Future Design Contest sponsored by Tech Briefs, COMSOL, HP and others. Pleas share with friends.
http://contest.techbriefs.com/2015/entries/consumer-products/5851
Thanks,
John
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Chris:
There is a limit to the output of my current prototypes; small listening rooms.
I believe my design is limited only by the motor and by the total surface area of the diaphragm(s).
What are the limits of cone shaped diaphragms?
John
John,
Thank you for the answer to my question, but no need to be defensive with your response.
I'm intrigued by your new/different approach to transducer design...not combative.
Be well,
Chris
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I imagine that a long triangular or square cross section diaphragm like the one used would twist significantly along its length when being driven at one end, and this would affect coherence by providing multiple arrival times—in fact, a time period over which a steep-fronted impulse would arrive at the listener, slowing the rise time and blurring detail. That's my first thought seeing something this long being driven from one end.
I guess that, acoustically, this is an omni directional line source which is a nice configuration for home use.
Have you tried a motor at each end, M. Gaudreault?
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I wish you the best John, but if you can't tell me if it's better than say my laptop speakers...
You could have a room full of people that listen to it, but if they don't say a word perhaps none of them will buy it or invest. Yet if even just you said, not to bad right, for a triangle. Who knows what they'd say or pay once they start defining what they hear. For the record not everyone believes reviewers or testimonials anymore than the manufactures comments.
I have to assume if you're hear you have a mild amount of confidence. I'm inclined to say I'd like to help you in anyway possible but you have to tell me if it even sounds like music. I assume it does, but I don't think it should be a stretch to say yes.
Russell, I wondered about that too, however I realized that you're talking about motor matching. Tight tolerances and stiffness might be more practicle initially.
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Russell, I wondered about that too, however I realized that you're talking about motor matching. Tight tolerances and stiffness might be more practicle initially.
No, I'm not talking about motor matching, unless I misunderstand you.
I was simply addressing the configuration chosen where a long, narrow shape is being rapidly oscillated by a motor driving it at the end. It seems to me that at higher frequencies and louder levels, where significant torque is being applied in a rapidly alternating directions, that there might be enough twist to be audible, if the device is light enough to respond properly at high frequencies. In my mind the design trade off would be similar to cone speakers in that you want lightness of the diaphragm but need strength at the same time. We all know about the complex break-up characteristics of cones, but why would that not also apply to long triangular shapes such as these?
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Russell, you weren't, but I'm fairly certain that's the first consideration once you jump into two motors.
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"I have to assume if you're hear you have a mild ammount of confidence. I'm inclined to say I'd like to help you in anyway possible but you have to tell me if it even sounds like music. I assume it does, but I don't think it should be a stretch to say yes."
Sorry I misunderstood the thrust of your question. It's sounds very good. It reveals a very great amount, of inner detail. It is able to decode more spatial information, though in a very natural manner, than any speaker I have heard. It plays very deep with exceeding realism. It is able to convey the decay of a plucked or struck string better than any other speaker I remember. I had never heard that anywhere but in my concert hall at the side of the Steinway grand. I love it. You have a very broad stereo band to sit in. With a good binaural sound source it creates an acoustic space that is most startling, when, the signal stops and this grand acoustic cathedral collapses into black silence.
John
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"I have to assume if you're hear you have a mild ammount of confidence. I'm inclined to say I'd like to help you in anyway possible but you have to tell me if it even sounds like music. I assume it does, but I don't think it should be a stretch to say yes."
Sorry I misunderstood the thrust of your question. It's sounds very good. It reveals a very great amount, of inner detail. It is able to decode more spatial information, though in a very natural manner, than any speaker I have heard. It plays very deep with exceeding realism. It is able to convey the decay of a plucked or struck string better than any other speaker I remember. I had never heard that anywhere but in my concert hall at the side of the Steinway grand. I love it. You have a very broad stereo band to sit in. With a good binaural sound source it creates an acoustic space that is most startling, when, the signal stops and this grand acoustic cathedral collapses into black silence.
John
Thanks John, I'm excited to see what it turns into now.
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Question - what are the design challenges and limitations you have encountered so far.
One of the main challenges was money. I call my self financially responsibile. From what I can glean from my reading and viewing Shark Tank, so far I have spent a small fraction of what others have spent for, prototyping. The downside is that it takes me much longer to move from point A to point B. ( For some bizarre reason many people criticize me for taking so long. )
Since I am not a mechanical or electrical engineer I have had to learn a lot of new skills. Consequently my early prototypes were crude and I would not call them works of art. Being an artist and having grown up working in my patent's bicycle shop I had developed good manual skills. Those skills did not fully preparing me for this challenge but the one skill that was most valuable was and is patience.
Patience with the machine shops I had to rely on was a trial. I understand the economics of their business and the difficulty of doing "onesies and twosies."
But unfortunately some are real jerks. Some are understanding and patient and some won't even discuss doing business with you. Fortunately there is one small shop not far from me and the owner is fair and reasonable.
One of the issues was that I was not having everything machined all at once. Now that I have everything "worked out" and I have blueprints for everything then I can just get everything made at once. You have to realize that there is what they call "setup time." The time required to get all of the machine tools ready to do a task, the time to look over the blueprints and finalize the plan for executing, and then cleanup and billing. When you have four or eight built at once, as opposed to one or two, then the cost per unit falls dramatically.
One other difficulty is doing something differently than has been done before. You don't have many reference resources for how to proceed. So, I have to look at many diverse disciplines to piece together a "road map."
Fortunately we all have that great ocean of information at our fingertips.
John
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John,
Thank you for the answer to my question, but no need to be defensive with your response.
I'm intrigued by your new/different approach to transducer design...not combative.
Be well,
Chris
Chris, I am sorry! I did not intend to sound combative!
I was just trying to make the point that there are two issues; electrical efficiency and acoustic efficiency. (Then there is the interplay between the two.) They are the same with all speaker technologies. (There are differences with the effect of enclosures on two dimension diaphragms.) I think it could be stated as torque verses force for the difference in motor types but surface area is directly proportional between two dimensional diaphragms and three dimensional diaphragm. That's my guess based on my limited experiments. There is definitely a need for more research in this area. The phase behavior of the three dimensional diaphragm is an area that demands research in the future, since it is that principal or property that allows the Planot to function at all. When there is a single instance, where a principal breaks down then there is powerful new science lurking in that anomaly. I hope I am making sense.
John
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I would think that you would have issues with "shear" strength in the long shaft. If played loud or under stress.
https://en.wikipedia.org/wiki/Shear_strength
And I only mean that in the metallurgy sense of terms. Metal fatigue might be an issue after long periods of time.
Have you tried any different alloys with the shaft material ?
I know many machine/CNC shops don't know much about alloy/tool steels, because they most often use "hot rolled" steel, which is/are soft. There understanding of metallurgy is limited, in most cases.
Good luck,
V....
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John,
Your speaker are dipole as regular cone drivers?
Bipolar or elsemore?
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John,
Your speaker are dipole as regular cone drivers?
Bipolar or elsemore?
Th Planot driver is an omnidirectional radiator.
John
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I would think that you would have issues with "shear" strength in the long shaft. If played loud or under stress.
https://en.wikipedia.org/wiki/Shear_strength
And I only mean that in the metallurgy sense of terms. Metal fatigue might be an issue after long periods of time.
Have you tried any different alloys with the shaft material ?
I know many machine/CNC shops don't know much about alloy/tool steels, because they most often use "hot rolled" steel, which is/are soft. There understanding of metallurgy is limited, in most cases.
Good luck,
V....
These are trade secrets.
John
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Th Planot driver is an omnidirectional radiator.
John
So acoustic SPL will be low as all omnis or there is a way to increase it?
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So acoustic SPL will be low as all omnis or there is a way to increase it?
I'd think the farther it can rotate, and hence the size, the more SPL.
Rotation distance would be like Xmax, and to increase it you'd be forced to enlarge the driver so the distance traveled increases at the outside, but without making it go crazy like an owl head. This would take more and more dampening from the amp, I presume.
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I'd think the farther it can rotate, and hence the size, the more SPL.
Rotation distance would be like Xmax, and to increase it you'd be forced to enlarge the driver so the distance traveled increases at the outside...
I think you're right.
It would sure be cool to see these in action.
John, how loud have you played these?
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So acoustic SPL will be low as all omnis or there is a way to increase it?
Where do you get the idea that omnis are inherently low in SPL capability or even sensitivity, if that was what you are referring to?
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Russell, I bet since many are not aimed at your head, they are a little bit quieter or have some features that would make one think it. But that doesn't include things like MBL.
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I have to get back to work now. (I'll try to answer any more questions when I can.)
Thanks to everyone at Audio Circle.
This is great forum and everyone has great decorum.
Check my Web site for more information concerning the Live Feed on Twitter (with Frank Van Alstine) and please go to the Tech Briefs Create the Future Web site and click on my entry, to keep my views counter growing.
Please use the vote feature and vote for the Planot if you like it.
*Please follow the link below to vote for my submission to the Create the Future Design Contest.
Please vote for my entry. Also share this post!
Thanks and Promote the Planot.
http://contest.techbriefs.com/2015/entries/consumer-products/5851-planot-boxless-full-range-omnidirectional-speaker
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John,
As many here I would like to vote, but to so it is necessary to register and logon.
Do you would have a direct link to the vote page?
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Where do you get the idea that omnis are inherently low in SPL capability or even sensitivity, if that was what you are referring to?
My omnis knowledge is limited, I think omnis are low sensitivity as dipoles, not SPL capability.
Do you would mention some hi sensitivity omnis?
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John,
As many here I would like to vote, but to so it is necessary to register and logon.
Do you would have a direct link to the vote page?
Sorry, no. The registration is necessary so that there is no cheating. Their privacy statement says they will not use the info for anything but vote verification. Complete privacy; I will not know who votes. No SPAM, etc. They do check e-mails for false addresses.
John
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My omnis knowledge is limited, I think omnis are low sensitivity as dipoles, not SPL capability.
Do you would mention some hi sensitivity omnis?
I can think of two other true omni's;
the German Physiks (BORDERLAND MK IV) and the MBL (Radialstrahler 101E).
They both require a lot of power, my guess, because of the nature of the mass and stiffness of their designs and not because they are omnidirectional.
(Please list any other true omnidirectional speakers/drivers you can think of. Don't include speakers that use reflectors or diffusers to smoosh the sound.)
John
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I can think of two other true omni's;
the German Physiks (BORDERLAND MK IV) and the MBL (Radialstrahler 101E).
They both require a lot of power, my guess, because of the nature of the mass and stiffness of their designs and not because they are omnidirectional.
(Please list any other true omnidirectional speakers/drivers you can think of. Don't include speakers that use reflectors or diffusers to smoosh the sound.)
John
And Ohm...
http://ohmspeaker.com/
On the material for the shaft I'd think composites would be an obvious choice, you can make them in many different ways to suit the application best and the stiffness to weight ratio will be better than any other material I can think of right now...
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John, I saw this little teaser... https://www.youtube.com/watch?v=ZeGtdKoxk20 (https://www.youtube.com/watch?v=ZeGtdKoxk20)
I don't see any movement and from what I can gather, they are generating a fair bit of volume in that brief demo. This is truly exciting! You've obviously come up with something very original that is truly unique. Well done sir! I can hardly wait to see these developed into a commercial product. :thumb:
Having said that, I would not demo them without some bass augmentation. It's pretty hard to judge satellites without some bottom end.
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John, I saw this little teaser... https://www.youtube.com/watch?v=ZeGtdKoxk20 (https://www.youtube.com/watch?v=ZeGtdKoxk20)
I don't see any movement and from what I can gather, they are generating a fair bit of volume in that brief demo. This is truly exciting! You've obviously come up with something very original that is truly unique. Well done sir! I can hardly wait to see these developed into a commercial product. :thumb:
Having said that, I would not demo them without some bass augmentation. It's pretty hard to judge satellites without some bottom end.
Those were not made by me but an acquaintance. (A particle physics who does work at the LHC.) I am not sure what Bunn used to record the demo but I think the lack of low end is due to two things; inadequet dampening of the moving system and the recording equipment. Actually I recommend using a highpass filter to remove subsonic noise. I would recommend rolling off the low end at maybe, 30 Hz. There is not much music there to worry about and anyway you're just taxing the system. Two more Planots could be constructed and an electronic crossover could send just the bass to them.
(Try using a spectrum anylizer at a live un-amplified classical concert and see what low end you can see/hear; noise excluded.)
John
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Have you seen the rotary subwoofer?
http://www.eminent-tech.com/RWbrochure.htm
I wonder if you can somehow use a planot driver in the same way as the rotary driver and make a Planot subwoofer?
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John,
As many here I would like to vote, but to so it is necessary to register and logon.
Do you would have a direct link to the vote page?
Voting is simple.
Open this link... http://contest.techbriefs.com/2015/entries/consumer-products/5851-planot-boxless-full-range-omnidirectional-speaker (http://contest.techbriefs.com/2015/entries/consumer-products/5851-planot-boxless-full-range-omnidirectional-speaker)
Scroll down to where it says... WANT TO VOTE FOR THIS ENTRY?
Register (it's free and only takes 2 minutes)
Then log on and vote.
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Have you seen the rotary subwoofer?
http://www.eminent-tech.com/RWbrochure.htm
I wonder if you can somehow use a planot driver in the same way as the rotary driver and make a Planot subwoofer?
No.
John
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No.
John
But there's a plethora of horn type devices that could be done. I'm sure one could get huge gain in sub frequencies that way. However I'm not sure it'd be a worthwhile endeavour... I suppose someone would have to find out.
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Reposted from DIYAUDIO.COM...
JTMcCski is offline JTMcCski
diyAudio Member
Join Date: Jul 2015
(Smile) "Planot a true innovation"
The Planot does work; and not just a curiosity. The space, air, pleasure ratio is huge. I live local to the designer so I have been up to hear it more than once. In even early versions it had ambiance like no other I've heard. Been into this for 40 years and visited many audio salons and years at RMAF. The Planot may not be in production but it will do accurate reproduction in it's current frequency range like nothing I have ever heard.
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Old Yesterday, 08:29 PM #302
JTMcCski is offline JTMcCski
diyAudio Member
Join Date: Jul 2015
(Default) "Already there..."
I contend it is already among the best midrange and tweeter reproducers I've ever heard.
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Perspectives are promising.
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Reposted from DIYAUDIO.COM...
JTMcCski is offline JTMcCski
diyAudio Member
Join Date: Jul 2015
(Smile) "Planot a true innovation"
The Planot does work; and not just a curiosity. The space, air, pleasure ratio is huge. I live local to the designer so I have been up to hear it more than once. In even early versions it had ambiance like no other I've heard. Been into this for 40 years and visited many audio salons and years at RMAF. The Planot may not be in production but it will do accurate reproduction in it's current frequency range like nothing I have ever heard.
Report Post Reply With Quote Multi-Quote This Message Quick reply to this message
Old Yesterday, 08:29 PM #302
JTMcCski is offline JTMcCski
diyAudio Member
Join Date: Jul 2015
(Default) "Already there..."
I contend it is already among the best midrange and tweeter reproducers I've ever heard.
Been into this for 40 years but he just Joined DIYAudio in Jul 2015 - 2 posts, lives nearby...very interesting...
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Come to a show, meeting or shoot out and let some of us listen to it. If it sounds good, then we have obviated the need for measurements.
I was invited to give a demo to the Chicago Audio Club. That date passed and I am still working on my new motors. As far as I know the offer is still open. I learned not to pre-announce a date until I was ready!
I was interested in the Rocky Mountain Audio Fest. I have attended it in the past. Now people are recommending the AXPONA as having better attendance and being cheaper. I have been invited by Mr. Soo to give a talk and demo at next year's California Audio Show.
I have had audiophiles over to listen and they either don't want to have their opinions aired publicly, I assume because they are afraid of being attacked by people for their opinion, or those audiophiles that have agreeded to have their opinions posted are ridiculed in forums like this. I have had one writer from an small online audio publication listen. He literally left, looking like a zombie. I never heard back from him again; no article. I have pointed out that there is a You Tube video of a personally built prototype by a highly regarded particle physicist, but that's not good enough to prove basic functionality?
Larry who worked for DEQX came out, on his own dime, for three days from Denver and did measurements. He left me the measurements. I have the raw data from REW and screen shots of those results displayed in the program. At the time I had a poorly functioning P4 and P3. P3 was not yet properly adjusted and its performance did suffer. Using the DEQX we were able to get the frequency response very flat. Later, after Larry left, I used the REW software he was using, (Larry taught me how to use the software) and the microphone and USB microphone preamp and a Radio Shack audio meter that Larry recommended. I fine tuned the magnetic homing and dampening device on P4 and produced the graph I published on my Web site.
I will do the live audio stream with Frank Van Alstine I will have to wait for my new prototypes to be finished. I will have to fit this into our schedules as well as two audiophiles' schedules, that I will invite to my home. I will be doing some short test video streams, using P3, that I will be airing weeks prior to main video stream event.
As I said before I will proceed at my own pace and no one else's. I make no apologies.
Bye. I will not respond to any more questions here, for now.
If you have questions send them to:
info@planotspeaker.com
I will get back with an announcement of the live video streams. Stay tuned.
John