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Old 18th November 2014, 11:06 PM   #21
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by gmad View Post
Hi Scott,

I hope you won't give up on this so soon. I have observed increased SPL with the hypercubes relative to the equivalent volume sealed box. With the 64hz distortion test I performed I had to reduce the signal level slightly (~1db) being sent to the amplifier when powering the hypercube in order to match the SPL of the sealed box. The test data that was published was done with the mic closer to the drivers than the pictures show (~2" from the phase plug vs. ~6" in the pics). I am assuming right now that the difference in efficiency will be slightly more when measured from a bit further away. The hypercube speaker is made from 6mm acrylic and is unstuffed. The sealed box is made from 12mm plywood and has open-cell foam inside. The two enclosures are of equivalent volume and happen to be almost exactly the recommended sealed volume (Q of 0.7). --Greg
Hi,

You can't assume anything. Did you use one driver ? two ?
did you swap them ? Nevertheless there is no chance of
the "hypercube", lets just call it a polyhedron somewhere
between a cube and a sphere producing 3dB more output.
Because a sphere doesn't and your being blown smoke.

rgds, sreten.

a hypercube is simply a object of of the number of dimensions
multiplied together, its a cube for 3 dimensions, a square for
two, and mind bending constructs for 4 or more dimensions.
There is nothing hypercube about a 3D polyhedron.
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Old 18th November 2014, 11:15 PM   #22
gmad is offline gmad  United States
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Hi Sreten,

I used the same driver for each test - I removed it from one enclosure and reinstalled it in the other. The name of the speaker (hypercube) is not after the shape of the enclosure, but what the inventors believe is the shape of the sound waves inside the enclosure. --Greg
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Old 18th November 2014, 11:21 PM   #23
gmad is offline gmad  United States
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Hello,

For anyone whom this is worth anything to, I will share a little of info about myself and my experience with this speaker design. I am a musician (bass, voice), music teacher and "audiophile". I play my electric bass through 12" transmission line enclosures (made by Euphonic Audio) because I typically find ported and sealed speaker designs too muddy sounding. My favorite gig locations are outdoors because I feel the "dryness" of the sound let's me connect more with my fellow musicians. Up to this point, the transmission line enclosures have provided me with the closest tone to what I hear with good open-back headphones. I was shocked when I heard the level of tonal accuracy of the hypercube design. One of my favorite bass players is Jimmy Johnson (james taylor, Flim and the BB's) and I knew withing 2 seconds of transferring the driver to the (empty) hypercube enclosure (I was playing Flim and the BB's at the time) that there was indeed something special about this shape. I used a small driver because this was just an experiment. After listening to a pair of these little speakers for an evening, I concluded that they were good enough to be my main listening speakers for at least the foreseeable future. I did not expect that. With a minimal amount of digital room correction (DRC3.2.1 by Dennis Sbraigon) these speakers now provide me with a completely satisfactory musical experience.

That being said, I do not expect anyone to take my subjective claims seriously. That is why I waited until I had data to back up my claims. I suppose I could have rigged the whole thing but what would my motivation be for doing that? I simply want to share what I have discovered. The reason I built the equivalent volume sealed boxes was so that I could make comparison measurements and share the results in case something actually came of this. I tried to give the advantage to the sealed box. The hypercube design turned out to be vastly superior. I was prepared to take a lot of criticizm when I decided to share my findings. It will be worth it when someone decides "what the hell" and tries it for themselves. --Greg
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Old 18th November 2014, 11:44 PM   #24
gmad is offline gmad  United States
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Hello again Sreten:

I think to call this shape "a polyhedron somewhere between a cube and a sphere" may be overly simplistic. After all, if there weren't something special about dividing an entity into 12 equal parts (an octave musically speaking), then we wouldn't have any music to listen to on our precious loudspeakers. --Greg
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Old 18th November 2014, 11:51 PM   #25
sreten is offline sreten  United Kingdom
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Hi,

I've no problem with your attitude*, its fine by me.
A thoroughly inquistive nature will reveal the truth.

Excuse me for not understanding the nonsense context
"hypercube" is used, as its all nonsense, in terms of the
wave functions in a 3d space, utter pseudotechobabble.

However i don't find your attitude inquistive, just
extreme opinion based on very flimsy prejudice.

rgds, sreten.

* As an ex bass player (not done it for years) I find
nearly all of your observations about bass playing
wrong, just very biased clueless self opinion.

Last edited by sreten; 18th November 2014 at 11:55 PM.
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Old 18th November 2014, 11:52 PM   #26
GM is offline GM  United States
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Quote:
Originally Posted by xrk971 View Post
I suspected it was not the same GM as the glowing review was uncharacteristic.
Yeah, the only time I can recall being that jubilant/'gushing' WRT sound systems was the first time I experienced a large cinema system at the Fabulous Fox Theater in Atlanta for the 3D premier of Hondo Vs pre-1952 TVs and tabletop AM radios, but then I was only 6 yrs old, so 'gushed' over just about everything new and different.

GM
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Old 19th November 2014, 12:12 AM   #27
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by gmad View Post
Hello again Sreten:

I think to call this shape "a polyhedron somewhere between a cube and a sphere" may be overly simplistic. After all, if there weren't something special about dividing an entity into 12 equal parts (an octave musically speaking), then we wouldn't have any music to listen to on our precious loudspeakers. --Greg
Hi,

No i'm completely right in no simplistic sense.

There is nothing special about a 12 faced polyhedron
and it has nothing to do with a 12 tempered scale.
It simply doesn't do the nonsense that is claimed.

I'd say given nearly all your ideas about bass equipment
are simply (very wrong) very personal bias your a highly
unreliable reporter of anything to be considered reliable.

rgds, sreten.
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Old 19th November 2014, 12:12 AM   #28
gmad is offline gmad  United States
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Hi Sreten,

When discussing something as subjective as musical experience I'm surprised to hear you say my observation is wrong because it doesn't match yours. Anyway, I welcome your challenges but lets keep it about the physics of loudspeaker design. Again, I have provided measurement data because I don't expect anyone to care about my subjective observations. I'm glad you feel that a thoroughly inquistive nature will reveal the truth. I could not agree more. I invested a lot of time, money and energy in this experiment to ensure that it is reasonably fair and accurate. Some will say that is precisely the reason why I "hear" a difference. For those people I have provided measurement data as have the inventors. Let's argue the data. --Greg
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Old 19th November 2014, 12:23 AM   #29
sreten is offline sreten  United Kingdom
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Hi,

No problem with any objective data. Certainly those two enclosures
wil be very different, with a structure tending to a spheroid tending
to one humungous resonance unless you do something about it.
I've no problem with polyhedral stuctures being better than cubes.

rgds, sreten.

Regarding musical experience saying TL is better than sealed
or vented is just being opiniated, as is outdoors being better
than indoors, it all depends on what you want to do and the
equipment you have, and what it can do indoors or outdoors.

Though I agree ourdoors bass is fabulously flat, but not that loud.

Last edited by sreten; 19th November 2014 at 12:35 AM.
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Old 19th November 2014, 12:30 AM   #30
Squeak is offline Squeak  Denmark
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The thing is, it is probably not a bad way to build a closed speaker cab at all. As already mentioned it is reasonably close to a sphere, with the advantages that brings and the vertices will make it multi resonant and attenuate some HF.
But the same goes for any polyhedron to varying degrees.
If it was only left at that, but all the thinly (and not so thinly) veiled mysticism and frivolous speculation is an instant turnoff or at best amusing to most people here.

Last edited by Squeak; 19th November 2014 at 12:32 AM.
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