A Real SL 2000 Hack. Replace stock (burnt voice coils) with "silk diaphragm dome ".

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  • xschop
    xschop Posts: 4,722
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    Another closet tweaker. They creep here stealthily.
    Don't take experimental gene therapies from known eugenicists.
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  • xschop
    xschop Posts: 4,722
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    VSAT, my 2nd set of Wuhan silks are broken in. Wonderful SQ improvement over non-drilled pole-pieces and bare silks. I doped them again using Vit. A oil.
    Don't take experimental gene therapies from known eugenicists.
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  • VSAT88
    VSAT88 Posts: 1,227
    edited August 2022
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    Careful with the dope. Just saying, lol.... Tried any ferrofluid yet? I actually took the time to complete a very quick job tonight. A set of Tangent 400 xovers I wanted to put two new electrolytes in. 68uF for the woof section. Ordered the wrong parts. I did not get non polarized. Sad man. Had to put in another order and wasted the time I had..
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  • xschop
    xschop Posts: 4,722
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    Oops. 68uf is a big size. What speaks you putting them in?

    No ferrofluid in these. Both chambers are stuffed with lamb's wool.
    Don't take experimental gene therapies from known eugenicists.
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  • VSAT88
    VSAT88 Posts: 1,227
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    "Silence of the Lambs"
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  • VSAT88
    VSAT88 Posts: 1,227
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    Klipsch Tangent 400.
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  • MrGeology
    MrGeology Posts: 83
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    This thread is awesome.
    "They’re not after me, they’re after you… I’m just standing in the way!” -Donald J. Trump, 45th President of the United States
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  • VSAT88
    VSAT88 Posts: 1,227
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    Thanks from all. We gotta have something to do right?
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  • lawdogg
    lawdogg Posts: 450
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    Anyone want these SL2500 guts? I lost the dang diaphragm. Just lmk where to ship it.

    ekuqymtg1lsk.jpg
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    <3 my 3.1TLs

    I will fix your shifted magnets for free. :)
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  • VSAT88
    VSAT88 Posts: 1,227
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    1st time for everything.. 1st time I ever saw a 2500 torn down.
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  • xschop
    xschop Posts: 4,722
    edited September 2022
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    Is it just the one?
    Don't take experimental gene therapies from known eugenicists.
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  • lawdogg
    lawdogg Posts: 450
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    Yeah just one unfortunately.
    <3 my 3.1TLs

    I will fix your shifted magnets for free. :)
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  • xschop
    xschop Posts: 4,722
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    Is the pole-piece drilled/hollowed out under the felt?
    Don't take experimental gene therapies from known eugenicists.
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  • lawdogg
    lawdogg Posts: 450
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    xschop wrote: »
    Is the pole-piece drilled/hollowed out under the felt?

    Yes, it has a bit of a cup cut into it. It tapers inward on a curve and is flat at the bottom.

    wv91cjlvwhgz.jpg
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    <3 my 3.1TLs

    I will fix your shifted magnets for free. :)
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  • Gardenstater
    Gardenstater Posts: 4,199
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    Is there an airspace behind the plus sign shaped felt piece, due to that recess? If so, that would actually increase the sound absorption of the felt.
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Crown D150 amp
    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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  • lawdogg
    lawdogg Posts: 450
    edited September 2022
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    The felt "+" is convex, and the recess in the pole piece is concave, so yes there is a roughly spherical (call it spheroid) air space underneath the felt, truncated by a plane normal to the spheroid's radius at the bottom by the flat base of the pole piece recess.
    <3 my 3.1TLs

    I will fix your shifted magnets for free. :)
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  • xschop
    xschop Posts: 4,722
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    Those would be interesting to hear what a set of RD0194's vs a set of "wuhan" domes sound like, without having to change the crossover.
    Don't take experimental gene therapies from known eugenicists.
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  • VSAT88
    VSAT88 Posts: 1,227
    edited September 2022
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    honynuniyax9.jpg
    Another interesting note. I have found another source @xschop. A few things sent for you to review. May well be competition for Black Dragons. We shall see. Made in Taiwan too, not Red China...
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  • xschop
    xschop Posts: 4,722
    edited September 2022
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    Well well, the yellow dragons landed today.
    Bold move posting that flag on the Club CCP, Grasshopper.
    Even Maverick cucked to them and removed it from his flight jacket lol.
    Don't take experimental gene therapies from known eugenicists.
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  • plastic_avatar
    plastic_avatar Posts: 690
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    - Yellow Dragons?! Give us a link!
    - 2 of my tweeters on the 1C had flat, dense felt discs, and the magnets were roughly symmetrical.

    ab8fgcyh2rmx.jpeg

    - The other 2 had hard felt domes, and the magnets were waaaaay oblong to one third of the circle.

    lveqzqyabb7u.jpeg

    - I had to clip the plastic around the screw holes of the Wuhans so they could be mounted.

    9016syefnk96.jpeg

    - I decided to experiment with a printed diffuser with wool inserts, rather than just do something normal... but I might change the design so I can put the wool+wool plug in the center... Having fun playing with it =)

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    The Thrifty Setups in Mah House Big thrifty stereo in the basement w/ my custom SDA-1C (built with help from kind forum members) * Beautiful 1966 MCM GE console upgraded w/ Bluetooth, Dual turntable, and Paradigm speakers in family room * Swanky 1980 Realistic system and great TEAC eq with dancing colored lights in the living room * Ye Olde college stereo in the garage
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  • VSAT88
    VSAT88 Posts: 1,227
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    Hot dang there is some kinda smooth manufacturing going on round here.

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  • pitdogg2
    pitdogg2 Posts: 24,624
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    You do not want the felt touching the dome itself. The dome needs room to reasonate or it will sound muffled. FWIW
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  • xschop
    xschop Posts: 4,722
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    Nice tinkering. If you don't like the sound, then try actual Lamb's wool. Just make sure your platform does not touch the back of the dome.
    Don't take experimental gene therapies from known eugenicists.
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  • plastic_avatar
    plastic_avatar Posts: 690
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    Same vertical dimensions as the original felt dome, but a little wider.

    Printing a revision with an extra diffusion ring (and room for the lamb's-wool-filled dense wool ring in the middle), plus a hair smaller on the horizontal... Seems like a better design...

    [waits 10 minutes for the print...]
    The Thrifty Setups in Mah House Big thrifty stereo in the basement w/ my custom SDA-1C (built with help from kind forum members) * Beautiful 1966 MCM GE console upgraded w/ Bluetooth, Dual turntable, and Paradigm speakers in family room * Swanky 1980 Realistic system and great TEAC eq with dancing colored lights in the living room * Ye Olde college stereo in the garage
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  • xschop
    xschop Posts: 4,722
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    However you go about it, the idea is to best remove the backwave reflections from making back to the dome. Kinda like the @Gardenstater foam-frame mod for your tweets.
    Don't take experimental gene therapies from known eugenicists.
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  • plastic_avatar
    plastic_avatar Posts: 690
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    Gotta trim the felt just a little bit, but there is an even, symmetrical gap between the dome and the diffuser.

    Will it work????

    No idea, yet!

    Wools courtesy xschop and VR3.
    xb46o8a1puu5.jpeg
    The Thrifty Setups in Mah House Big thrifty stereo in the basement w/ my custom SDA-1C (built with help from kind forum members) * Beautiful 1966 MCM GE console upgraded w/ Bluetooth, Dual turntable, and Paradigm speakers in family room * Swanky 1980 Realistic system and great TEAC eq with dancing colored lights in the living room * Ye Olde college stereo in the garage
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  • plastic_avatar
    plastic_avatar Posts: 690
    edited September 2022
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    Well, it works =)

    I know, not the right crossover, but wanted to see!

    Damn YouTube and copyright trolls! Can't even share an unlisted link to a partial song for testing =[
    The Thrifty Setups in Mah House Big thrifty stereo in the basement w/ my custom SDA-1C (built with help from kind forum members) * Beautiful 1966 MCM GE console upgraded w/ Bluetooth, Dual turntable, and Paradigm speakers in family room * Swanky 1980 Realistic system and great TEAC eq with dancing colored lights in the living room * Ye Olde college stereo in the garage
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  • Gardenstater
    Gardenstater Posts: 4,199
    edited September 2022
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    Taken a little further and you could have the first MAT (Metamaterial Absorption Technology) tweeter like KEF has done with their fullrange drivers. I don't know if miniaturizing if for a tweeter would work and it is unknown if having it so close to the dome would minimize the "absorption" you would get. Theirs must be further from the back of the cone but the wavelengths are smaller in a tweeter.

    95rok1c86cga.jpg

    https://international.kef.com/pages/metamaterial
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Crown D150 amp
    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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  • Gardenstater
    Gardenstater Posts: 4,199
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    OK it turns out that it is functional for the tweeter part of their driver (I think) and there is a fairly long tube leading through the magnet assembly to the labyrinth of 15 x 2 = 30 tubes at the back of the driver.

    https://www.youtube.com/watch?v=O_US3Kml0Cg

    jm4mohuv83ct.jpg

    m8kdrxwtyfx1.jpg

    c4y5mvqglaf5.jpg

    xttmnzi87seh.jpg

    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Crown D150 amp
    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
    · Share on FacebookShare on Twitter
  • plastic_avatar
    plastic_avatar Posts: 690
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    Wow o.O
    The Thrifty Setups in Mah House Big thrifty stereo in the basement w/ my custom SDA-1C (built with help from kind forum members) * Beautiful 1966 MCM GE console upgraded w/ Bluetooth, Dual turntable, and Paradigm speakers in family room * Swanky 1980 Realistic system and great TEAC eq with dancing colored lights in the living room * Ye Olde college stereo in the garage
    · Share on FacebookShare on Twitter