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

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  • xschop
    xschop Posts: 4,684
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    Now to drill pole pieces, hopefully without having to remove magnets....


    ntpmt44xv4zs.jpg
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  • xschop
    xschop Posts: 4,684
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    Got so hot from drilling, that the top plate glue let go and it shifted on the other one....

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  • xschop
    xschop Posts: 4,684
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    Billet rear chambers are the perfect tweeter mag removal tool.....

    noke6ygl13wm.jpg
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  • Tony M
    Tony M Posts: 11,015
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    That's a bummer. :#

    R&D has it's ups and downs for sure.
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • Tony M
    Tony M Posts: 11,015
    edited October 2020
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    Are you going to use the same glue / adhesive again?
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • VSAT88
    VSAT88 Posts: 1,227
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    Locktite red.
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  • xschop
    xschop Posts: 4,684
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    MUCH easier to drill and chamfer without the pesky magnet attached. Think I'll go make a tweeter mag centering dowel...Now to find some new felt pads and lambs wool...

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  • VSAT88
    VSAT88 Posts: 1,227
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    Looking some type of good !!
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  • xschop
    xschop Posts: 4,684
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    Tony M wrote: »
    Are you going to use the same glue / adhesive again?

    I'm going with Loctite Blue like I did on the MWs.
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  • xschop
    xschop Posts: 4,684
    edited October 2020
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    I used non-magnetic high impact brass for the removal and locating dowel and 7075 aluminum for the magnet removal base....
    Dowel ID.... 0.995
    Dowel OD..... 1.210
    Mag base ID..... 2.650
    Mag base OD....3.00"
    Mag base length needs to be at least 2.00" in order to prevent the magnet from inadvertently pulling the pole piece back.

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  • Gardenstater
    Gardenstater Posts: 4,183
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    Nice! Another set of rebuild tools in the making.
    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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  • xschop
    xschop Posts: 4,684
    edited October 2020
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    This mod is for TonyM. Fair warning, use a 45° max chamfering tool and don't go wider than 1.325" Total ID and ALL domes including the Wuhans will still seal/seat properly.

    These are my testing frames/bezels for a few more mods I'll be doing. Heck, the new inset domes have better side clearance than the factory....

    kh11zrqv160x.jpg

    nkschds6wazz.jpg

    7n0rhzzcx41h.jpg


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  • Tony M
    Tony M Posts: 11,015
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    Perfect! ;)

    I didn't even think of using a chamfering tool / bit.

    I wonder if my woodworking bits would work in my little drill press. Or should I just break out one of my routers or my router and table combo?

    You've got my brain working again. B)

    Maybe with a 45 degree router bit with a bearing attached...

    I don't own or know of anybody with a milling machine or lathe BUT I do own a lot of router bits and routers... :p
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • VSAT88
    VSAT88 Posts: 1,227
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    Wuhan, wonder if they would be willing to spin off a few hundred with the same voice coil depth. Best I remember the voicemail itself was not as tall as the original.
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  • xschop
    xschop Posts: 4,684
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    Do you guys' SL2000s come with the paper spacers between faceplate and diaphragm?

    I'm thinking of using 1mm thick PVA foam to ensure the backsides are truly seated and padded correctly.

    The Wuhan domes sit rear of the faceplate, whereas factory set on the forward lip. Measuring mine, they engage the pole piece correctly.
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  • VSAT88
    VSAT88 Posts: 1,227
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    Best I recall yes. My SL 2000's did have the papers.
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  • xschop
    xschop Posts: 4,684
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    I stopped by Wally World. Found the correct size felt pads, but no Lambs wool.
    How close is Dacron to Lambs wool?
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  • Tony M
    Tony M Posts: 11,015
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    VSAT88 wrote: »
    Best I recall yes. My SL 2000's did have the papers.

    All but one had it. I might've lost it over the years... :#
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • Gardenstater
    Gardenstater Posts: 4,183
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    The higher the density, the better the sound absorption for a given thickness, and the lower frequencies will be absorbed better (so less of an issue here?). Anyway, the thicker the better, which is why in my Danish Peerless the wadding goes right up to the hole in the dome, I'm sure.
    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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  • xschop
    xschop Posts: 4,684
    edited October 2020
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    You technically don't want the felt ring touching the back-side of the dome correct? I'll have to machine a 7/16" hole punch so they end up like the ones modified in the How-to link.

    And scratch the PVA foam as a backer. It causes too much gap between dome and bezel when 4 screws are snugged down.

    I was listening to the Wuhans last night for awhile in my 5bs. One in plastic frame and one in the new billet frame with the new un-punched felts on pole-pieces and just the rear ports taped-off.... Upper mids cleaned up somewhat just from the new felts.
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  • BlueBirdMusic
    BlueBirdMusic Posts: 2,076
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    xschop wrote: »
    I'm lost on Joe's clamp?


    Here is one thread from 2010.

    https://forum.polkaudio.com/discussion/100092/joes-the-clamp/p1

    The links to pictures are broken. Some people on the Forum have one. I seem to remember Toolfan66 made a few several years ago, and I remember "intellectual property" involved.

    Anyone out there have a picture to post?
    "Sometimes you have to look to the past to understand where you are going in the future"


    Harry / Marietta GA
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  • xschop
    xschop Posts: 4,684
    edited October 2020
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    Ive made quite a few things over the years that people have sent me....looks quite familiar.... All I'm saying
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  • Gardenstater
    Gardenstater Posts: 4,183
    edited October 2020
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    When I read that link it was not clear to me whether he kept the open cell foam *plug* in the pole vent and just added the wool ring or whether he got rid of the foam. The photos seem to indicate he got rid of it.

    I would think that in tweeters without the pole piece vent mod, with only the hole in the dome (aperture tuning), that it would be ideal to shape the felt or wool with some fly tying scissors so that it is a dome shape but with some clearance. No touching, just like in the strip clubs lol.

    PS - why can't the genius vanilla programmers fix all the links that they broke?
    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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  • xschop
    xschop Posts: 4,684
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    Gardenstater wrote: »
    When I read that link it was not clear to me whether he kept the open cell foam *plug* in the pole vent and just added the wool ring or whether he got rid of the foam. The photos seem to indicate he got rid of it.

    I would think that in tweeters without the pole piece vent mod, with only the hole in the dome (aperture tuning), that it would be ideal to shape the felt or wool with some fly tying scissors so that it is a dome shape but with some clearance. No touching, just like in the strip clubs lol.

    PS - why can't the genius vanilla programmers fix all the links that they broke?

    These innernets get twisted...

    I can't find your PM about the specialized copper used for binding posts now.

    I think the Lambs wool in vent hole and stuffed in chamber would be best.




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  • Gardenstater
    Gardenstater Posts: 4,183
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    Oh that's the Tellurium Copper. Very machinable and has nearly the conductivity of Copper. I believe it is what Cardas uses.
    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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  • xschop
    xschop Posts: 4,684
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    Gardenstater wrote: »
    Oh that's the Tellurium Copper. Very machinable and has nearly the conductivity of Copper. I believe it is what Cardas uses.

    Thought it was tellurium you mentioned.
    It does not oxidize as easily or quickly as solid copper either.

    I believe I have a couple ft. of it in 1" OD....
    Will be perfect for the Eddy mods I'll be doing to these tweeters and some MWs...

    yowyqsffb0y3.jpg


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  • Gardenstater
    Gardenstater Posts: 4,183
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    Eddy mods? I'm sure we'll find out what they are soon :D
    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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  • xschop
    xschop Posts: 4,684
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    One of the old Polk brochures you guys posted (mHardy perhaps) mentioned the early midwoofers' pole pieces were copper-plated to alleviate the Eddy currents. Some of the high end tweeters have the copper sleeves on their pole-pieces. I believe Polks new Legend Mids also have them.
    One thing's for sure, this material machines out to a WAY better surface than the cast pole-pieces that leave the factory.

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  • xschop
    xschop Posts: 4,684
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    DIY felt punches

    tcj8npynfxhd.jpg
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  • VSAT88
    VSAT88 Posts: 1,227
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    Hell yeah ! Glad you figured the felt deal out. Daddy was not much help. He has some dementia and did not remember much about even using felt. All he has was really old and way too small/ wrong size. The Shaff piano repair book was not much help either with the sizes they offered and shapes I am sure you could find it somewhere else much more suitable for less change.
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