Mini models of the SDA SRS. i need help with crossovers.

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  • Lerjebrink
    Lerjebrink Posts: 35
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    Gardenstater wrote: »
    Can you make him loosen up a bit and have him playing air guitar?
    Done
    x8i4a4n2p7tv.jpg


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  • Lerjebrink
    Lerjebrink Posts: 35
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    SeleniumFalcon wrote: »
    I sent a photo of your first sculpture to Matthew Polk and he replied:

    "3D printed? Very cool.
    I'm honored. -msp"

    I'll send him the white lab coat version, I'm sure he'll get a kick out of it. Well done!

    What!!
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  • heiney9
    heiney9 Posts: 25,693
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    Lerjebrink wrote: »
    56ha6vnrqv00.jpeg
    Some progress on the tweeters!

    How will you make them a progressive point source like the "real" SDA's?

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | Galion TS P75 Pre | Holo Audio Cyan 2 Dac | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | Roon Nucleus 1 w/LPS - Tubes add soul!
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  • msg
    msg Posts: 10,646
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    Lerjebrink wrote: »
    Gardenstater wrote: »
    Can you make him loosen up a bit and have him playing air guitar?
    Done
    d1duqydjbg0z.png
    This is awesome. This belongs as a permanent image somewhere on the forum B)
    I disabled signatures.
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  • Lerjebrink
    Lerjebrink Posts: 35
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    heiney9 wrote: »
    Lerjebrink wrote: »
    56ha6vnrqv00.jpeg
    Some progress on the tweeters!

    How will you make them a progressive point source like the "real" SDA's?

    H9

    I use almost the same HF components as the original. Hopefully it sounds better than just 4 straight tweeters with the same components.
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  • heiney9
    heiney9 Posts: 25,693
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    Lerjebrink wrote: »
    heiney9 wrote: »
    Lerjebrink wrote: »
    56ha6vnrqv00.jpeg
    Some progress on the tweeters!

    How will you make them a progressive point source like the "real" SDA's?

    H9

    I use almost the same HF components as the original. Hopefully it sounds better than just 4 straight tweeters with the same components.

    But they aren't the same drivers, so using the same electrical parameters is sort of moot. I predict lots' of lobing issues as well as phase issues and combing issues. The spacing of drivers and baffle angle on original SDA's is pretty critical to SDA success.
    Not trying to be a downer, just curious about critical elements of the SDA's and how well you've considered them.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | Galion TS P75 Pre | Holo Audio Cyan 2 Dac | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | Roon Nucleus 1 w/LPS - Tubes add soul!
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  • Lerjebrink
    Lerjebrink Posts: 35
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    heiney9 wrote: »
    Lerjebrink wrote: »
    heiney9 wrote: »
    Lerjebrink wrote: »
    56ha6vnrqv00.jpeg
    Some progress on the tweeters!

    How will you make them a progressive point source like the "real" SDA's?

    H9

    I use almost the same HF components as the original. Hopefully it sounds better than just 4 straight tweeters with the same components.

    But they aren't the same drivers, so using the same electrical parameters is sort of moot. I predict lots' of lobing issues as well as phase issues and combing issues. The spacing of drivers and baffle angle on original SDA's is pretty critical to SDA success.
    Not trying to be a downer, just curious about critical elements of the SDA's and how well you've considered them.

    H9
    Who knows. I mostly make them to look like the big ones. Just a bonus if they sound ok. I think i have better chances with 4 differently tuned tweeters than just 4 straight wired ones

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  • Gardenstater
    Gardenstater Posts: 4,928
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    The closer drivers are together the less lobing and comb filtering. Kind of by definition. And he copied the crossover so they aren't playing the same bandwidths.
    George / NJ

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  • xschop
    xschop Posts: 5,811
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    Lerjebrink wrote: »
    heiney9 wrote: »
    Lerjebrink wrote: »
    heiney9 wrote: »
    Lerjebrink wrote: »
    56ha6vnrqv00.jpeg
    Some progress on the tweeters!

    How will you make them a progressive point source like the "real" SDA's?

    H9

    I use almost the same HF components as the original. Hopefully it sounds better than just 4 straight tweeters with the same components.

    But they aren't the same drivers, so using the same electrical parameters is sort of moot. I predict lots' of lobing issues as well as phase issues and combing issues. The spacing of drivers and baffle angle on original SDA's is pretty critical to SDA success.
    Not trying to be a downer, just curious about critical elements of the SDA's and how well you've considered them.

    H9
    Who knows. I mostly make them to look like the big ones. Just a bonus if they sound ok. I think i have better chances with 4 differently tuned tweeters than just 4 straight wired ones

    I'd be interested how they would perform as near-field monitors too. Overkill would be welcomed.
    Don't take experimental gene therapies from known eugenicists.
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  • msg
    msg Posts: 10,646
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    heiney9 wrote: »
    Lerjebrink wrote: »
    heiney9 wrote: »
    Lerjebrink wrote: »
    56ha6vnrqv00.jpeg
    Some progress on the tweeters!

    How will you make them a progressive point source like the "real" SDA's?

    H9

    I use almost the same HF components as the original. Hopefully it sounds better than just 4 straight tweeters with the same components.

    But they aren't the same drivers, so using the same electrical parameters is sort of moot. I predict lots' of lobing issues as well as phase issues and combing issues. The spacing of drivers and baffle angle on original SDA's is pretty critical to SDA success.
    Not trying to be a downer, just curious about critical elements of the SDA's and how well you've considered them.

    H9
    👎
    I disabled signatures.
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  • skipshot12
    skipshot12 Posts: 2,152
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    heiney9 wrote: »
    Lerjebrink wrote: »
    56ha6vnrqv00.jpeg
    Some progress on the tweeters!

    How will you make them a progressive point source like the "real" SDA's?

    H9

    Way cool.

    What will be the dimensions of the finished minis?
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  • VR3
    VR3 Posts: 29,740
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    Ok how do we order the Matt Polk statue
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • Lerjebrink
    Lerjebrink Posts: 35
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    VR3 wrote: »
    Ok how do we order the Matt Polk statue

    Hahaha wait a little! I will think about this and actually make some more. Hold on
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  • Lerjebrink
    Lerjebrink Posts: 35
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    skipshot12 wrote: »
    heiney9 wrote: »
    Lerjebrink wrote: »
    56ha6vnrqv00.jpeg
    Some progress on the tweeters!

    How will you make them a progressive point source like the "real" SDA's?

    H9

    Way cool.

    What will be the dimensions of the finished minis?

    Outside dimensions in mm will be 248Wx635Lx158D

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  • Lerjebrink
    Lerjebrink Posts: 35
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    rm65wuadiagh.jpeg

    Time for some soldering on the inside
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  • Lerjebrink
    Lerjebrink Posts: 35
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    u400h6djs18n.jpeg
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  • Lerjebrink
    Lerjebrink Posts: 35
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    mycb66es65u5.jpeg
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  • heiney9
    heiney9 Posts: 25,693
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    I do applaud your vision. Very cool even if they don't turn out to sound like SDA's. If they do, then that's a bonus.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | Galion TS P75 Pre | Holo Audio Cyan 2 Dac | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | Roon Nucleus 1 w/LPS - Tubes add soul!
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  • msg
    msg Posts: 10,646
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    Lerjebrink wrote: »
    skipshot12 wrote: »
    Way cool.
    What will be the dimensions of the finished minis?
    Outside dimensions in mm will be 248Wx635Lx158D
    woah woah woah, are those dimensions in Celsius or Kiloliters or something?
    I disabled signatures.
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  • Unknown
    Unknown
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  • ptrooper
    ptrooper Posts: 703
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    MM is more scientifically and mathematically advanced. Millimetre

    French Scientists / French Academy of Sciences Invented in 1790 during the French Revolution to create a unified, rational system based on the natural world (originally derived from the Earth's circumference).

    Inch Ancient Romans / Anglo-Saxons Originally based on human anatomy—the width of a human thumb. The Ancient Romans introduced the uncia (meaning "one-twelfth" of a foot). King Edward II of England later standardized it in the 14th century as the length of three grains of barley placed end-to-end.
    SDA SRS 1.2TL VR3 Duelund Monoliths<3,Lumin u2x,LHYas8 Pro+ Switch,Transparent Reference MM2 xlr,power and speaker cables.FTA Sinope SE usb...Working on it!
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  • xschop
    xschop Posts: 5,811
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    The metric sytem finds a constant of mass and volume within pure water.
    Don't take experimental gene therapies from known eugenicists.
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  • agfrost
    agfrost Posts: 2,497
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    Measurements to nearest picometer or go home. ;)



    Seriously, enjoying watching your project come together.
    Jay
    SDA 2BTL * McCormack DNA 0.5 amp * Oppo BDP-93 * Modded Adcom GDA-600 DAC * Rythmik F8 (x2)
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  • Unknown
    Unknown
    edited October 5
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  • Lerjebrink
    Lerjebrink Posts: 35
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    You guys count in feet… 🦶🏼
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  • audioluvr
    audioluvr Posts: 6,076
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    ptrooper wrote: »
    French Scientists / French Academy of Sciences Invented in 1790 during the French Revolution to create a unified, rational system based on the natural world (originally derived from the Earth's circumference)

    Along the equator or the poles? They are different dimensions.
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    There is about a 5% genetic difference between apes and men …but that difference is the difference between throwing your own poo when you are annoyed …and Einstein, Shakespeare and Miss January. by Dr. Sardonicus
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  • audioluvr
    audioluvr Posts: 6,076
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    Lerjebrink wrote: »
    You guys count in feet… 🦶🏼

    Feet fingers and toes
    Gustard X26 Pro DAC
    Belles 21A Pre Upgraded with Mundorf Supremes
    B&K M200 Sonata monoblocks refreshed and upgraded
    Polk SDA 1C's modded / 1000Va Dreadnaught
    Wireworld Silver Eclipse IC's and speaker cables
    Harman Kardon T65C w/Grado Gold. (Don't laugh. It sounds great!)

    There is about a 5% genetic difference between apes and men …but that difference is the difference between throwing your own poo when you are annoyed …and Einstein, Shakespeare and Miss January. by Dr. Sardonicus
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  • ptrooper
    ptrooper Posts: 703
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    audioluvr wrote: »
    ptrooper wrote: »
    French Scientists / French Academy of Sciences Invented in 1790 during the French Revolution to create a unified, rational system based on the natural world (originally derived from the Earth's circumference)

    Along the equator or the poles? They are different dimensions.

    Yep, they used the pole-to-equator distance, which is just one-quarter of the polar circumference. Same math, just a specific slice of the globe.

    Looking forward to a price on the 3d Matthew polk Figurine with flag ship SRS.

    I bet,@Lerjebrink ,will soon be bombing out the big boys in the near future.
    SDA SRS 1.2TL VR3 Duelund Monoliths<3,Lumin u2x,LHYas8 Pro+ Switch,Transparent Reference MM2 xlr,power and speaker cables.FTA Sinope SE usb...Working on it!
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  • Lerjebrink
    Lerjebrink Posts: 35
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    ptrooper wrote: »
    audioluvr wrote: »
    ptrooper wrote: »
    French Scientists / French Academy of Sciences Invented in 1790 during the French Revolution to create a unified, rational system based on the natural world (originally derived from the Earth's circumference)

    Along the equator or the poles? They are different dimensions.

    Yep, they used the pole-to-equator distance, which is just one-quarter of the polar circumference. Same math, just a specific slice of the globe.

    Looking forward to a price on the 3d Matthew polk Figurine with flag ship SRS.

    I bet,@Lerjebrink ,will soon be bombing out the big boys in the near future.

    Yea probably, adult money is very dangerous.
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