@pelanj
Interesting.
Oddly enough this idea builds off the ideas of Hegeman and Morrison that I referenced above.
Interesting.
Oddly enough this idea builds off the ideas of Hegeman and Morrison that I referenced above.
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@synquasi: I built a pair and you can also see some in room measurements - I can make more if you wish. You can try to build a mock up with plastic or paper tubes and hear for yourself, it is really interesting, how these work.
@mhenschel: You are most probably right. I know these from Claudio and there was also an example of a similar principle from Spain, I think it is referenced in the main thread.
@mhenschel: You are most probably right. I know these from Claudio and there was also an example of a similar principle from Spain, I think it is referenced in the main thread.
IMHO, insofar as omnidirectionality goes, I think that Stewart's concept and Don's refinements represent a more direct and elegant approach.
I believe that Don has done a lot of tweaking on the bass loading since 1977 when he took over the operation.
I believe that Don has done a lot of tweaking on the bass loading since 1977 when he took over the operation.
My concerns are mostly about how the sound is going to combine from your 16 slices. Depending on the dispersion and acoustic center of each segment at each frequency you may wind up with variable lobing.
But, with so many sources, it may also average out and not be a problem.
Or still be greatly improved compared to the lobing you previously experienced. Ultimately my worry may be more of a theoretical issue than a practical one.
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Wow, it is very close to what I am attempting with the segmented horns, but they use a centrally mounted driver whereas I am attempting to design with multiple folded horns.
Any idea on the performance of the Platinium Air pulse 3.1. I'l. see if googling helps me. But looks awesome.
Hi @pelanj, I did do some more reading on this unusual design. It has got me intrigued. Would like to know more about the listening experience. BTW I think the thin cascading tower design looks great in metal square tube. Would the sound vary mush using different materials, ie Wood, steel, PVC?
I have just tried the metal tubes, because of the looks. I would not expect any change in sound due to material. To me even the total length is not critical as long as the individual ones follow the logarithm rule.
The listening is different from anything I have heard before. I always describe it as if you painted a stage plan for the band and elevated the plane up. Then, no matter where you move in the room, the band members always stay in the same place. The tonal ballance is also very even in a very wide area, which is given by the omnidirectional nature. The "stageplan" extends around the speakers depending on their distance and position relatively to the walls.
I miss a bit on both ends - the single speaker needs a bit of eq on the top end and a subwoofer below - or a little EQ for low volume listening.
My pair is now being rebuilt into its final shape with 3D printed base and black finish.
The listening is different from anything I have heard before. I always describe it as if you painted a stage plan for the band and elevated the plane up. Then, no matter where you move in the room, the band members always stay in the same place. The tonal ballance is also very even in a very wide area, which is given by the omnidirectional nature. The "stageplan" extends around the speakers depending on their distance and position relatively to the walls.
I miss a bit on both ends - the single speaker needs a bit of eq on the top end and a subwoofer below - or a little EQ for low volume listening.
My pair is now being rebuilt into its final shape with 3D printed base and black finish.
Hi synquasi
I'm Claudio, the inventor of the bizarre MDD system. I am unable to make high-level recordings. If the quality of a Zoom H2n stereo audio recorder is enough in the next few days I could make some recordings. It is not a live listening but you can guess that the system works, especially the bass are attenuated and the presence effect is lost.
We accept suggestions for links to free music without restrictions on copyright.
I'm Claudio, the inventor of the bizarre MDD system. I am unable to make high-level recordings. If the quality of a Zoom H2n stereo audio recorder is enough in the next few days I could make some recordings. It is not a live listening but you can guess that the system works, especially the bass are attenuated and the presence effect is lost.
We accept suggestions for links to free music without restrictions on copyright.
I'm absolutely baffled (infinitely baffled?) by the idea that you can discern anything useful by listening on your playback system to a compressed video of another playback system in a room. Especially when you're concerned with imaging/soundstaging.
When dealing with equipment without major flaws, the only thing you can hope to demonstrate is the ability of the videographer to achieve a pleasing presentation with his recording gear. As a comparison, would you say an orchestra images badly or has poor frequency response because the recording engineer did a bad job? It's not the orchestra's fault.
It also reminds me of an old Bose TV commercial where they were comparing one of their systems to a piano. Playing recordings of each through a nationwide broadcast system and ultimately on a poorly placed 30 cent TV speaker/amplifier was somehow supposed to demonstrate that you couldn't tell the difference between a concert piano and a Bose radio. If that abysmal TV speaker is not the limiting factor in what you're doing, you've done something very wrong somewhere. And to be honest, they had because you could hear a difference, but that's a whole other discussion.
I only bring it up because listening to recordings of playback systems seems to be a thing these days and it always leaves me wondering how it got popular in the first place.
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@mattstat, I only ask as I have not seen/heard anything that remotely indicates that this works.
I’m not saying it doesn’t work but the videos I have seen have no audio associated.
It would be good to see a video with audio to show that it has some qualities that I am interested in like limited lobing effect and while I don’t disrespect the science behind the idea, I need to know that a bunch of resonant tubes can create a musical reproduction.
I question when I am missing information and so far I am not convinced. I really want to be convinced as if it does what is written I am sold but I need more information, hence a video.
I’m not saying it doesn’t work but the videos I have seen have no audio associated.
It would be good to see a video with audio to show that it has some qualities that I am interested in like limited lobing effect and while I don’t disrespect the science behind the idea, I need to know that a bunch of resonant tubes can create a musical reproduction.
I question when I am missing information and so far I am not convinced. I really want to be convinced as if it does what is written I am sold but I need more information, hence a video.
Hi synquasi
some videos with almost MDD audio are already on YouTube. These are older 665g and 669g models that sound less good than the last ones, especially the MDD3FE25d prototype. I removed the links from my site as the recordings lose a lot compared to direct listening. Already these old prototypes can greatly improve the listening experience compared to the audio standard of televisions or PC multimedia systems. They cost very little: a driver and a few tubes.
For the omnidirectional emission DonVK made a very interesting simulation of a transmission line with multiple tubes. In general, diffraction emits sound fronts at 360 degrees as long as the dimensions of the driver (or the section of the tube) are less than the wavelength, with 25 mm you are already below 34 mm which is the wavelength at 10 KHz. Part of the energy is also sent to the ceiling, which also reflects it towards the listener.
In my post in the MDD tread I measured the frequency response at the output of the individual tubes. The individual resonances are evident, distributed in a homogeneous way, they compensate each other and listening is excellent.
MDD technology has as its primary objective the emission of delayed signals to simulate the three-dimensionality of instruments that emit sound energy from multiple points in space. In your design, the radial emissions of the horns would cause delays in depth, with the reflections originating in the room. There is no height distribution, the drivers are all at the same level. For lateral distribution, the distance between the right and left channels is already present.
One last thing. For listening in non-acoustically treated and small rooms (4 x 4 x 3 m) I prefer a linear or 3D emission to a point source, it is a subjective preference, such as preferring direct or diffused lighting.
I apologize for the space used in your tread to talk about my MDD projects.
some videos with almost MDD audio are already on YouTube. These are older 665g and 669g models that sound less good than the last ones, especially the MDD3FE25d prototype. I removed the links from my site as the recordings lose a lot compared to direct listening. Already these old prototypes can greatly improve the listening experience compared to the audio standard of televisions or PC multimedia systems. They cost very little: a driver and a few tubes.
For the omnidirectional emission DonVK made a very interesting simulation of a transmission line with multiple tubes. In general, diffraction emits sound fronts at 360 degrees as long as the dimensions of the driver (or the section of the tube) are less than the wavelength, with 25 mm you are already below 34 mm which is the wavelength at 10 KHz. Part of the energy is also sent to the ceiling, which also reflects it towards the listener.
In my post in the MDD tread I measured the frequency response at the output of the individual tubes. The individual resonances are evident, distributed in a homogeneous way, they compensate each other and listening is excellent.
MDD technology has as its primary objective the emission of delayed signals to simulate the three-dimensionality of instruments that emit sound energy from multiple points in space. In your design, the radial emissions of the horns would cause delays in depth, with the reflections originating in the room. There is no height distribution, the drivers are all at the same level. For lateral distribution, the distance between the right and left channels is already present.
One last thing. For listening in non-acoustically treated and small rooms (4 x 4 x 3 m) I prefer a linear or 3D emission to a point source, it is a subjective preference, such as preferring direct or diffused lighting.
I apologize for the space used in your tread to talk about my MDD projects.