RD0 Billet Faceplate Upgrade

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  • xschop
    xschop Posts: 4,707
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    Aesthetics is one thing. I prefer the black and billet look. But if you're worried about oxidation, don't. I built these 6061 billet baffle plates a few years ago and they're untreated and unwaxed/polished even....

    5nn2w1gb8y4x.jpg

    Don't take experimental gene therapies from known eugenicists.
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  • pitdogg2
    pitdogg2 Posts: 24,585
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    Nice!!^^
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  • F1nut
    F1nut Posts: 49,806
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    Put me on the mailing list, please.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • xschop
    xschop Posts: 4,707
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    Is there an "official" TL mod/addition to the original ported 5Jr x-over? Don't want to go rogue lol.
    Don't take experimental gene therapies from known eugenicists.
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  • Toolfan66
    Toolfan66 Posts: 16,924
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    xschop wrote: »
    Aesthetics is one thing. I prefer the black and billet look. But if you're worried about oxidation, don't. I built these 6061 billet baffle plates a few years ago and they're untreated and unwaxed/polished even....

    5nn2w1gb8y4x.jpg

    I always wanted to build a set of monitor 7's out of billet aluminum..
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  • F1nut
    F1nut Posts: 49,806
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    xschop wrote: »
    Is there an "official" TL mod/addition to the original ported 5Jr x-over? Don't want to go rogue lol.

    Not that I'm aware of.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • xschop
    xschop Posts: 4,707
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    Toolfan66 wrote: »
    xschop wrote: »
    Aesthetics is one thing. I prefer the black and billet look. But if you're worried about oxidation, don't. I built these 6061 billet baffle plates a few years ago and they're untreated and unwaxed/polished even....

    5nn2w1gb8y4x.jpg

    I always wanted to build a set of monitor 7's out of billet aluminum..

    That'd definitely fix any baffle flex.
    Don't take experimental gene therapies from known eugenicists.
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  • Tony M
    Tony M Posts: 11,017
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    The grills would retire to the closet if I had fronts that looked that darn good. ;)
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • plastic_avatar
    plastic_avatar Posts: 690
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    o.O

    Whoa.
    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: 4,190
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    How thick is that 6061 T6(?) aluminium baffle? What is the Young's Modulus? Just kidding with the 2nd question ;)
    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: 4,707
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    0.625 inch @ 40,000 psi.

    What do you think the particle board modulus is?😂
    Don't take experimental gene therapies from known eugenicists.
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  • xschop
    xschop Posts: 4,707
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    Toolfan66 wrote: »
    xschop wrote: »
    Aesthetics is one thing. I prefer the black and billet look. But if you're worried about oxidation, don't. I built these 6061 billet baffle plates a few years ago and they're untreated and unwaxed/polished even....

    5nn2w1gb8y4x.jpg

    I always wanted to build a set of monitor 7's out of billet aluminum..

    If I were to go that route, I would mount the MW and tweeter on one of the sides and have the passive pointed to either side. Slim, Tall 7's.
    Don't take experimental gene therapies from known eugenicists.
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  • Gardenstater
    Gardenstater Posts: 4,190
    edited March 2022
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    xschop wrote: »
    0.625 inch @ 40,000 psi.

    What do you think the particle board modulus is?😂

    ***Nerd Alert***Nerd Alert***

    MOE (Modulus of Elasticity)

    6061 T6 68.9 GPa = 9.99 x 10^6 psi
    18mm Particle Board = 2.048 GPa = 2.97 x 10^5 psi
    18mm MDF = 3.326 GPa = 4.82 x 10^5 psi
    16mm Particle Board = 3.424 GPa = 4.97 x 10^5
    16mm MDF = 3.010 GPa = 4.37 x 10^5

    This is from a Chinese study (of course) that I found the other day. Pretty weird the difference in MOE for MDF vs Particle Board for 18mm (approx 3/4") thickness.

    ag70wme9v6qa.jpg


    https://asm.matweb.com/search/SpecificMaterial.asp?bassnum=ma6061t6
    https://www.fpl.fs.fed.us/documnts/pdf2019/fpl_2019_guan001.pdf
    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: 4,190
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    The 18mm PB panels they tested were lower density than the 16mm and than the MDF, by far. I wonder if the same holds true everywhere.......

    136e4ws4kcqq.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
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  • xschop
    xschop Posts: 4,707
    edited March 2022
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    If it is MIC, then it's a crapshoot.
    You trusted your melamine baby formula...just sayin'
    Don't take experimental gene therapies from known eugenicists.
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  • pitdogg2
    pitdogg2 Posts: 24,585
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    xschop wrote: »
    If it is MIC, then it's a crapshoot.
    You trusted your melamine baby formula...just sayin'

    Do not forget that was also sold as a dog food ingredient.
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  • Gardenstater
    Gardenstater Posts: 4,190
    edited March 2022
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    For Made in USA Aurauco, standard PB (Duraflake) vs standard MDF:(Trupan)

    MOE (Modulus of Elasticity):

    PB: 350,000 psi = 2.41 GPa
    MDF: 420,000 psi = 2.90 GPa

    So it kind of bears out the Chinese paper, as far as the MDF being quite a bit stiffer.

    https://na.arauco.com/en/resources/download/DURAFLAKE_PB_STANDARD
    https://na.arauco.com/en/resources/download/TRUPAN_spec-Standard
    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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  • Toolfan66
    Toolfan66 Posts: 16,924
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    zhb94d2due44.jpeg
    gqkklwbjuelg.jpeg
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  • pitdogg2
    pitdogg2 Posts: 24,585
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    Sweet!
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  • xschop
    xschop Posts: 4,707
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    1st class.
    Don't take experimental gene therapies from known eugenicists.
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  • Toolfan66
    Toolfan66 Posts: 16,924
    edited March 2022
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    I’m not sure what they use to cut these but they did end up a hair bigger than the template I set him, with a print as well. since it is very thin and very flimsy I’m sure that was part of the issue, not a big deal, and I didn’t want to bother him with it.

    So I am sandwiching them (six at a time) between two templates, and taking a small file to them, and finishing them off with emory cloth. It’s really not that bad, takes a few minutes is all, much better fit.

    3irthwbr6l8e.jpeg
    2abhorka21vr.jpeg
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  • txcoastal1
    txcoastal1 Posts: 13,132
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    This thread is sick!! B)

    2-channel: Modwright KWI-200 Integrated, Dynaudio C1-II Signatures
    Desktop rig: LSi7, Polk 110sub, Dayens Ampino amp, W4S DAC/pre, Sonos, JRiver
    Gear on standby: Melody 101 tube pre, Unison Research Simply Italy Integrated
    Gone to new homes: (Matt Polk's)Threshold Stasis SA12e monoblocks, Pass XA30.5 amp, Usher MD2 speakers, Dynaudio C4 platinum speakers, Modwright LS100 (voltz), Simaudio 780D DAC

    erat interfectorem cesar et **** dictatorem dicere a
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  • xschop
    xschop Posts: 4,707
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    As long as the perimeter of the silk diaphragm interfaces with them and the throat ID of the plate snugly, you're golden.
    Don't take experimental gene therapies from known eugenicists.
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  • Toolfan66
    Toolfan66 Posts: 16,924
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    This one was built for the SL3000/2000 tweeters so the four holes don’t line up, my new ones for the RDO’s is at the platers, but it gives you the idea..

    x9crfopu7u9h.jpeg


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  • VR3
    VR3 Posts: 28,053
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    Delrin?

    I don't know if it is this thread but I saw an aluminum baffle and it looked badddd ****
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • xschop
    xschop Posts: 4,707
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    I don't want you to have any surprises with your new gaskets/insulators, but you may end up having to trim them around the RDO magnet top plate bosses.
    Don't take experimental gene therapies from known eugenicists.
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  • Toolfan66
    Toolfan66 Posts: 16,924
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    xschop wrote: »
    I don't want you to have any surprises with your new gaskets/insulators, but you may end up having to trim them around the RDO magnet top plate bosses.

    Nope, already tried the fit up early this morning, won't be a problem..
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  • Toolfan66
    Toolfan66 Posts: 16,924
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    VR3 wrote: »
    Delrin?

    I don't know if it is this thread but I saw an aluminum baffle and it looked badddd ****

    Yes delrin. yep the work on that baffle is sweet!!!

    q1saa9znlkqo.png
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  • xschop
    xschop Posts: 4,707
    edited March 2022
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    Toolfan66 wrote: »
    xschop wrote: »
    I don't want you to have any surprises with your new gaskets/insulators, but you may end up having to trim them around the RDO magnet top plate bosses.

    Nope, already tried the fit up early this morning, won't be a problem..

    Good deal. Just wanted you to be aware that the factory RDO bosses are designed a few thousands shorter than their diaphragms to ensure compression once magnet screws are tightened down, yet not overtorquing diaphragm plastic.
    Post edited by xschop on
    Don't take experimental gene therapies from known eugenicists.
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  • Toolfan66
    Toolfan66 Posts: 16,924
    edited March 2022
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    xschop wrote: »
    Toolfan66 wrote: »
    xschop wrote: »
    I don't want you to have any surprises with your new gaskets/insulators, but you may end up having to trim them around the RDO magnet top plate bosses.

    Nope, already tried the fit up early this morning, won't be a problem..

    Good deal. Just wanted you to be aware that the RDO bosses are designed a few thousands shorter than their diaphragms to ensure compression once magnet screws are tightened down, yet not overtorquing diaphragm plastic.

    By putting the same thickness across all of the surface you should be getting the same compression with or without it would you not? it is one of the reasons I wanted to cover the surface, yet have something better than electrical tape. Overtorquing? we are going from a plastic bezel to an aluminum billet bezel with four cross screws, well mine will be stainless hex, but that is not relevant. These are tweeters, not heads on a motor...
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