Archive for November, 2014

Why Hypercube Speakers Are Better Part 2

Friday, November 28th, 2014

hypercubeThe benefits of this design are not imaginary. They are backed up with objective test data. Tests confirm this enclosure can have an excellent impulse response and yet it can also serve as a passive radiator to enhance the acoustic ambiance.

Here are some measurements from a researcher posting at diyaudo.com who built some hypercubes and has been testing them:
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(click graphs to enlarge)

The graph above is the on-axis impulse response. As you can see it is sharp and the aftermath is uncomplicated, which is excellent.

The graph above this line shows that the frequency response is nearly omnidirectional below 2Khz. The readings taken at various angles from the woofer’s axis are quite similar for low and midrange frequencies. What this means is that the emanation pattern is broad and not beaming.

And the graph above this line shows that there is significant radiation from the cabinet, not mere diffraction from the woofer. The cabinet radiation profile is similar to the woofer’s across a broad range of frequencies. In other words it puts the woofer’s backwave to use supplementing the woofer to assist the creation of omni ambiance.

hypercube

If you click this picture it will take you to the the post from the person who made them and took the data and generated the graphs above.

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Giving Thanks

Thursday, November 27th, 2014

thanksToday, I give thanks.  There is so very much to be thankful for this year.

For one thing, I am still alive. There was a time, a few years ago, when I was convinced I would not live this long.

For another, I have met new friends, and exchanged experiences and insights with them. Most notably Greg Madama in NY, who will always remember this year as the year he built and heard his first hypercube loudspeaker.
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booksBut there is more! This is the year I finally decided not to be held back by my need for an agent, and published 4 books on Amazon. The Gamers and Gods trilogy is complete and available in eBook versions, and trade paperbacks by clicking here. The first book of my new Metaspace Chronicles series, called Pathspace, is also there, also available in kindle and trade paperback versions.  I’ve even had my first sales, although the royalties aren’t a lot yet because I decided to make the eBook versions only 99 cents until today.

hypercubesEven more to be thankful for. Greg started a discussion thread on a forum at diyaudio.com that received hundreds of posts and so far has received over 7000 views, and so thanks to Greg and the Internet the info on hypercube speakers is even more available to the humans of Earth. I posted myself there, showing pictures of prototypes and giving details on how to cut pieces to make the shape, and sharing some of my experiences with it over the years.

Here is a picture of one of Greg’s clear polycarbonate speakers before final assembly.

Yes, there is a lot for me to be thankful for this year.  Still alive, with new friends, getting the word out about hypercube speakers, and finally publishing. And the best is yet to come.

– MRK

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More Data

Wednesday, November 12th, 2014

 test both (click to enlarge)

A follow up on my last post.  More data just in from the bleeding-edge trenches of audio engineering! These from my fellow researcher G.M. showing the cumulative spectral decay (waterfall) plots of normal and hypercube-enclosed drivers.

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sealed waterfallHere is the sealed box waterfall. Click to enlarge

You can see that in a sealed box there is a lot of ringing across the lower part of the spectrum muddying the sound and coloring the notes.
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sealed waterfallAnd here is the Hypercube waterfall. Click to enlarge
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As you can see, the box ringing is almost all gone.
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Much purer sound.
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sealed waterfall

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And here is the Sealed Box vs Hypercube distortion.

As you can see, the hypercube (green line) is always less than the ordinary sealed box (purple line) — usually by 3 to 6 dB.

— MRK

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Building Hypercubes

Monday, November 10th, 2014

coverThe rumors are true. We persevered through all the many hungry years of secrecy and obscurity.

Finally we are allowed to give you a comprehensive guide to the construction of hypersolid resonators. This is a manual which for the first time clearly shows all steps.

You don’t have to struggle or calculate. We did that for you.

We’ve done the trial and error, paving the way for you to roll through and succeed.

Building Hypercubes will give you everything you need to know about basic hypersolid resonator construction.

  • Metal - for the strongest most weatherproof speakers
  • Plywood - for the lighter loudspeakers to be flown in arrays
  • Polycarbonate - for transparent loudspeakers
  • And much more. Every step from how to cut the wood to how to wire the backplate, plus test data, pictures, and suggestions for further research.

    — MRK

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    Independent Validation

    Saturday, November 8th, 2014

    enclosures.jpg (click to enlarge)

    My new fellow researcher G.M. has recently been courageous enough to test for himself my claim that the Rhombic Docecahedron (parallel projected hypercube) is far superior as a speaker box than the standard designs. He is building his own set for listening tests as well as objective comparison measurements.

    He built his first hypercube out of clear polycarbonate so that witnesses could see there was no acoustic padding inside it. For simplicity’s sake he energized it with a fullrange driver to avoid the complications of crossover effects on the sound.

    Today I received his first impressions. G.M. writes:

    “OH MY GOD THESE THINGS ARE INCREDIBLE. I have just one hypercube speaker completed so far. It’s SO much cleaner sounding than the sealed box…It’s not even close. The sealed boxes have twice the panel thickness and a fair amount of foam stuffing, yet resonate like crazy, muddying the sound to the extent that it’s instantly noticeable with bass and drums. To the contrary, it’s almost unbelievable how tight and dry sounding the hypercube speaker is. I feel very little vibration from the panels. Voices seem much less colored as well and I did notice a bit less directionality to the sound. It’s just as you said. I’m floored…..”

    I envy him. It’s not every day you get to enlarge your own world-view. You never forget the first time you hear a speaker in a hypercube compared to the same speaker in an ordinary padded box.

    Bravo, G.M.! I hope that when you have completed your testing you will permit me to use your real name for all the doubters who will think I made you up. I am certain you will find that objective measurements back up what your ears have already told you. Although any audiophile will drone that audio is a very subjective industry, once you have numbers and graphs you can challenge skeptics to perform the same experiment for themselves. Microphones and printers and FFT analyzers etc do not have subjective opinions.

    — MRK

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    New Works in Progress

    Saturday, November 8th, 2014

    I decided to start planning my next seven book series. This time I will over-deliver every way I can, including better cover designs for the trade paperbacks using public domain images since I am not an artist. This series will explore a new concept in techno-magic theory, in which the “wizards” of the post-Apocalyptic Earth are psionic engineers who work their wonders by sculpting the spatial distribution of various attributes of the Continuum.

    Here are the planned covers.  CLICK TO ENLARGE! The back cover text will probably need to be reworked.

    PathspacePathspace is the first book in a new series. Cover image by Irina Pechkareva.

    This text is now complete and is being proofread and edited.

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    Find the path that you are on.

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    SpinspaceSpinspace is the one I am writing now. Cover image by Irina Pechkareva. She does beautiful work. I admit it, I am crazy about fractals.

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    Turn and face thy quest-road long.

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    TonespaceTonespace will be written next. Cover image by Piotr Siedlecki. Another maker of beauty.

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    Find your note inside the Song.

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    HealspaceHealspace is planned.

    Cover image by Sharon Apted. Yet another virtuosa!
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    Heal until there’s nothing wrong.

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    Thinkspace

    Thinkspace is being planned.

    Cover image by Irina Pechkareva.
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    Think until your thinking’s strong.

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    LinkspaceLinkspace is being planned.

    Another image from Irina Pechkareva.

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    Link until your Linking’s strong.

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    SoulspaceSoulspace is in planning to be planned.
    Cover image by Sharon Apted.
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    Be yourself until you’re gone.
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