Second pair of SDA-2As
Comments
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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 onGeorge / 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 -
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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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.
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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. -
I haven’t seen them in person yet... hopefully gluing this weekend! Still have to cut the internal braces, tops and bottoms.
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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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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 -
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 -
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! -
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 -
In classic Polk fashion, you could always add an extra half-gallon of poly glue and let it drip from every seam. Don't take experimental gene therapies from known eugenicists.
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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 -
Got the bracing glued in nice and square! One more glue session and they’ll be complete! -
Nice. The MW backing rings will fit no problem.Don't take experimental gene therapies from known eugenicists.
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Both cabinets are fully glued!
Stopping by the shop tomorrow for some sanding and finishing. -
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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!
Before and after:
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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/ -
Man those look nice!!
What kind of plywood? -
Thanks!
I’m pretty sure it’s called B/BB 18mm Baltic Birch.
