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

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  • xschop
    xschop Posts: 5,811
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    Great job. One day there will be a set of Shorty 1.2 TL's with 1-piece faceplates in that same fashion. I'm a fan.
    Don't take experimental gene therapies from known eugenicists.
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  • Lerjebrink
    Lerjebrink Posts: 35
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    g6vl0t0kbxt8.heic
    61opqfuym4oc.jpeg

    Update
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  • Lerjebrink
    Lerjebrink Posts: 35
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    u0ok2mw8g6qy.jpeg
    s329rvrlgzde.jpeg
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  • F1nut
    F1nut Posts: 52,407
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    Sure are putting a lot of work into those. I hope they turn out ok.

    What is all the black stuff inside the cabinets?
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  • heiney9
    heiney9 Posts: 25,693
    edited September 12
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    The cabinets look really narrow (depth). Did you do calculations for frequency response of the box and PR? Where's the bracing? Just wondering.

    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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    F1nut wrote: »
    Sure are putting a lot of work into those. I hope they turn out ok.

    What is all the black stuff inside the cabinets?

    It”s 1 layer of butyl. Sound dampening
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  • Lerjebrink
    Lerjebrink Posts: 35
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    heiney9 wrote: »
    The cabinets look really narrow (depth). Did you do calculations for frequency response of the box and PR? Where's the bracing? Just wondering.

    H9

    Yes the calculations has been done. With ”exact” spare room for filters. If bracing is needed, i Will add some later.

    The plan right now is to use them as a 2.1 system, paired with a 8-10’ sub.

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  • F1nut
    F1nut Posts: 52,407
    edited September 14
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    Lerjebrink wrote: »
    F1nut wrote: »
    Sure are putting a lot of work into those. I hope they turn out ok.

    What is all the black stuff inside the cabinets?

    It”s 1 layer of butyl. Sound dampening

    That's what I thought. Unfortunately, your speakers will sound lifeless with that material in them.

    Rip all of it out and use polyfill.
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  • xschop
    xschop Posts: 5,811
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    Lerjebrink wrote: »
    F1nut wrote: »
    Sure are putting a lot of work into those. I hope they turn out ok.

    What is all the black stuff inside the cabinets?

    It”s 1 layer of butyl. Sound dampening

    If it is a few mils thick butyl rubber, it will help with cabinet vibes/resonance.
    You will probably have to brace a few spots in the middle line to really mitigate cabinet vibes just like the original 1.2's
    Don't take experimental gene therapies from known eugenicists.
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  • F1nut
    F1nut Posts: 52,407
    edited September 14
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    A few mils??? You need to look closer. Heck, he even stated, one inch.
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  • ptrooper
    ptrooper Posts: 703
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    Unless my eyes are painted on, it desn't look like 1"to me,correct me if I'm wrong ,the comment stated ,1 layer of butyl rubber.
    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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  • F1nut
    F1nut Posts: 52,407
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    You are correct, 1 layer. Still a lot thicker than a few mils.
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  • Gardenstater
    Gardenstater Posts: 4,928
    edited September 14
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    So basically Dynamat without the aluminum skin. Just as reflective of airborne sound waves as MDF (probably more) but will help dampen cabinet resonances some.
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • Lerjebrink
    Lerjebrink Posts: 35
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    F1nut wrote: »
    Lerjebrink wrote: »
    F1nut wrote: »
    Sure are putting a lot of work into those. I hope they turn out ok.

    What is all the black stuff inside the cabinets?

    It”s 1 layer of butyl. Sound dampening

    That's what I thought. Unfortunately, your speakers will sound lifeless with that material in them.

    Rip all of it out and use polyfill.

    No. In this case you are wrong. My friend made a pair of JBL minis, where i 3D printed a bunch of parts to him. I heard these speakers with and without this 3mm butyl sheets. It made very much difference, in a really good way. rppj9q0dct5o.jpeg
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  • F1nut
    F1nut Posts: 52,407
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    Maybe, maybe not. Completely different speaker designs.
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  • Lerjebrink
    Lerjebrink Posts: 35
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    6s9d0h973tp8.jpeg
    mi8r6v5s70mq.jpeg
    wxoo3v7qp33e.jpeg
    zys87gm167bi.jpeg
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  • Gardenstater
    Gardenstater Posts: 4,928
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    Looks great! 3D printed boards and cap holders? One thing I noticed is you have 2 inductors that are pretty close to each other without aligning one magnetic field perpendicular to the other one. Those will interact with each other.
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • Lerjebrink
    Lerjebrink Posts: 35
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    Gardenstater wrote: »
    Looks great! 3D printed boards and cap holders? One thing I noticed is you have 2 inductors that are pretty close to each other without aligning one magnetic field perpendicular to the other one. Those will interact with each other.

    x2bwpveeb9tu.jpg
    I think i solved it, thanks man
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  • Lerjebrink
    Lerjebrink Posts: 35
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    audioluvr wrote: »
    You should have posted this on April 1st. It would have made more sense. You should also build a mini Matthew Polk in a white lab coat that you can stand next to them. I have to admit though, you do have good taste in brandy.
    Lerjebrink wrote: »
    dewe2dxhmc0a.jpeg
    You wont believe this dp6x6d7q6aln.jpeg

    Next print will be with white lab coat, this was just a test

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  • xschop
    xschop Posts: 5,811
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    Lerjebrink wrote: »
    audioluvr wrote: »
    You should have posted this on April 1st. It would have made more sense. You should also build a mini Matthew Polk in a white lab coat that you can stand next to them. I have to admit though, you do have good taste in brandy.
    Lerjebrink wrote: »
    dewe2dxhmc0a.jpeg
    You wont believe this dp6x6d7q6aln.jpeg

    Next print will be with white lab coat, this was just a test

    @audioluvr ...The famous colloquial idiom is definitely warranted here....

    Don't take experimental gene therapies from known eugenicists.
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  • Gardenstater
    Gardenstater Posts: 4,928
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    Can you make him loosen up a bit and have him playing air guitar?
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • skipshot12
    skipshot12 Posts: 2,152
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    This is way cool.
    Applaud your vision.

    Can’t wait to hear your impressions of your project.
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  • ptrooper
    ptrooper Posts: 703
    edited October 2
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    Gardenstater wrote: »
    Can you make him loosen up a bit and have him playing air guitar?

    I want one of him sitting in this ...5xtcdtw5wbnx.jpg
    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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    Swear i understand all americans calling us swedes crazy
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  • Unknown
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    This content has been removed.
  • xschop
    xschop Posts: 5,811
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    Lerjebrink wrote: »
    Swear i understand all americans calling us swedes crazy

    Ingenuitive, not crazy. Enjoying the show and skills here.

    The high chair is from Squatty Audio, and only required by the height-challenged members here for the factory 1.2TLs. :D
    Don't take experimental gene therapies from known eugenicists.
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  • F1nut
    F1nut Posts: 52,407
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    The high chair is from Squatty Audio, and only required by the members here for the flawed design of the factory 1.2TLs.
    Fixed it for you and them.
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  • Gardenstater
    Gardenstater Posts: 4,928
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    The 1.2tl model:

    x7m6skqa4hsp.png
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • xschop
    xschop Posts: 5,811
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    The Squatty Deluxe.
    Don't take experimental gene therapies from known eugenicists.
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  • Lerjebrink
    Lerjebrink Posts: 35
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    56ha6vnrqv00.jpeg
    Some progress on the tweeters!
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