Second pair of SDA-2As

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  • Gardenstater
    Gardenstater Posts: 4,879
    edited November 2020
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    This is some interesting info on speaker enclosure construction materials and methods: http://www.resfreq.com/usefulinfoonwood.html

    Here's another interesting article: https://manualzz.com/doc/32045707/panel-damping-studies--reducing-loudspeaker-enclosure-vib...
    Post edited by Gardenstater on
    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: 5,739
    edited November 2020
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    Sorry for my vagueness, I programmed the RDO and SL2000 billet plates at 0.365" radius from center of mount hole to tweeter edge where it meets cabinet.
    Don't take experimental gene therapies from known eugenicists.
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  • spongebobsquarepants
    spongebobsquarepants Posts: 170
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    Thanks! Ive been driving myself nuts with this. I had the radius and diameter mixed up (very new to this). I divided my 19mm measurement by 2 and came up with 9.5mm (.374) but it didn't seem quite right. I was holding a tweeter plate up to the monitor at one point. :D
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  • xschop
    xschop Posts: 5,739
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    I didn't post about it specifically in the Billet RD0 thread either, but the bezel edge also covers up any small imperfections from the factory cabinet router-ing (sic).
    The 0.365r. is a snug fit....No air leaks there.
    Don't take experimental gene therapies from known eugenicists.
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  • xschop
    xschop Posts: 5,739
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    I hit the like button already. Very nice.
    Don't take experimental gene therapies from known eugenicists.
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  • Gardenstater
    Gardenstater Posts: 4,879
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    Looks great so far! A biscuit joiner would probably be helpful for glue-up and assembly (or assembaly as ol' Norm A. used to say).
    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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  • F1nut
    F1nut Posts: 52,294
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    Biscuit joints suck.
    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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  • spongebobsquarepants
    spongebobsquarepants Posts: 170
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    Pretty committed to dados, miters, and titebond 3 at this point. Went with the miters on the corners for looks, so theres no exposed layers of plywood. The miters should be pretty tight, they were cut with a 45 router bit on the cnc.

    Cant wait to put em together!
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  • Gardenstater
    Gardenstater Posts: 4,879
    edited February 2021
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    Even better! Locking miter or plain? I didn't see that in the picture although I think I see some dados on the side panels now that I look again.

    Be sure to account for glue soak when you do that, if plain miters. I think an initial coat brushed on and allowed to soak in after squeegee off excess will work well. Keep us posted!
    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
    · Share on Facebook
  • xschop
    xschop Posts: 5,739
    edited February 2021
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    In classic Polk fashion, you could always add an extra half-gallon of poly glue and let it drip from every seam. :D
    Don't take experimental gene therapies from known eugenicists.
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  • Gardenstater
    Gardenstater Posts: 4,879
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    If you want to be perfectionist, and why not since you're building from scratch, you might reinforce everything with a fillet of thickened epoxy on the inside (like tongue depressor radius). I guess I'd want to calculate how that would affect the volumetric space percentage wise but I'd guess it is minimal.
    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
    · Share on Facebook
  • spongebobsquarepants
    spongebobsquarepants Posts: 170
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    314gpzfzyodn.jpeg
    Got the bracing glued in nice and square! One more glue session and they’ll be complete!
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  • xschop
    xschop Posts: 5,739
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    Nice. The MW backing rings will fit no problem.
    Don't take experimental gene therapies from known eugenicists.
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  • spongebobsquarepants
    spongebobsquarepants Posts: 170
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    ee46lq9d7ixt.jpeg
    Both cabinets are fully glued!
    Stopping by the shop tomorrow for some sanding and finishing.
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  • spongebobsquarepants
    spongebobsquarepants Posts: 170
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    b9xi8ewhzye1.jpeg
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  • spongebobsquarepants
    spongebobsquarepants Posts: 170
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    Also.... thanks @westmassguy for doing a great job with these crossovers! Running them in the stock cabinets now and really enjoying it!
    b49kbyejmwyb.jpeg


    Before and after:

    8scppodygvcw.jpeg

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  • westmassguy
    westmassguy Posts: 6,850
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    My pleasure John.
    Home Theater/2 Channel:
    Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
    Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
    Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
    Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
    Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer

    dhsspeakerservice.com/
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  • pitdogg2
    pitdogg2 Posts: 27,766
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    Man those look nice!!
    What kind of plywood?
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  • spongebobsquarepants
    spongebobsquarepants Posts: 170
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    Thanks!
    I’m pretty sure it’s called B/BB 18mm Baltic Birch.
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