My 2024 Polk SDA 2b Modification Progress Thread (Drop1)
Comments
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So flashing tape comes in bitumen and butyl versions.
Dynamat is also privately owned so hard to find connections
Either way dynamat is a great product
I can actually tell the difference between the two types of flashing tape, the butyl tape still sticks a little in cold weather, the bitumen does not. -
Obligatory post:
Glued the driver magnets with JB Weld. Dynamat Xtreme to the woofer baskets. inb4 a little goes a long way.
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Re-sealed the cabinet seams with Loctite Power Grab Ultimate. Used up nearly an entire 9oz cartridge.
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To anyone who's re-veneered their Polk speakers - does anyone know how this trim piece on the front of my 2b is secured?
A brief update. I was able to remove the aforementioned piece of trim. Hopefully this makes my veneer job a bit easier and I can finally get on with the project.
I removed it by applying some heat via an electric hot pad. I let that sit for a few hours with the intent of softening the glue. I was able to pry it off fairly easily. Notice the old glue and 2 staples which secured it on.
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For reference, here is about how much glue came out of one SDA 2b cabinet. The glue softens up with heat and I was able to scrape it out with small plastic scraper tool. I don't regret doing it as a matter of being thorough however I don't know that it was entirely necessary. Certain spots within the cabinet were overly difficult to reach.
I like your attention to detail 👍
I actually thought about trying to remove the original joint sealer but found it to be a herculean effort.
Wish I’d known about the heat thing making that possible.
I have anal-retentive tendencies and it sucks, a friggin curse.
Carry on mit your bad self….
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I'm getting there... But this crossover thing is not as easy as it may appear. -
15 configurations later and I think I've settled on this -
For posterity's sake, #6 and #7 are switched in my diagram above.
And... the most difficult part of this project is done.
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Parts list:
Gen I Sonicap 20 uF 200VDC (x6)
Gen I Sonicap 12 uF 200VDC (x2)
Gen I Sonicap 5.8 uF 200VDC (x2)
Path Audio Resistor 0R5 (0.5R) Ohm 10W Thick Film ± 1% (x2)
Path Audio Resistor 2R7 (2.7R) Ohm 10W Thick Film ± 1% (x2)
0.4mH Jantzen Air Core Wire Coil AWG22, 0.63mm diameter wire (000-1489) (x2)
1.25mH Jantzen Air Core Wire Coil AWG20, 0.8mm diameter wire (000-1137) (x2)
2.5mH Jantzen Air Core Wire coil AWG20, 0.8mm diameter wire (000-1695) (x2)
Jantzen Audio 16mH 14 AWG C-Coil Toroidal Inductor (000-6577) (x2)
The connectors are Deutsch DT Series Connectors . I'm using Neotech Solid UPOCC Copper in PVC 16 AWG Yellow for wiring.
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Your Mar 19th post is awesome!
That goes a very long way to help others follow in your footsteps while avoiding re-“invention of the wheel!” Don’t be surprised if others use something similar for other models😊Samsung 60" UN60ES6100 LED, Outlaw Audio 976 Pre/Pro, Samsung BDP, Amazon Firestick, Phillips CD Changer
Canare 14 ga - LCR tweeters inside*; Ctr Ch outside
BJC 10 ga - LCR mids “Foamed & Plugged**”, inside* & out
8 ga Powerline: LR woofers, inside* & out
*soldered **Rob the Man (Xschop)
LR: Tri-amped RTi A7 w/Rotels*. Woofers - 980BX; Tweets & Mids - RB981*
Ctr Ch: Rotel RB981* -> Bi-amped CSi A6
Surrounds: Rotel 981* -> AR 12 ga -> RTi A3
*all connected w/Premiere ICs
5 Subs: Sunfire True SW Signature -> LFE & Ctr Ch; 4 Audio Pro Evidence @ the “Corners”
Power Conditioning & Distribution:
4 dedicated 20A feeds; APC H15; 5 Furman Miniport 20s -
That was simply my way of plotting out the circuit to make it easier for me to follow. I've swapped caps in a number of speakers before but this was my first full XO assembly. And I was only able to confidently do-so following in the footsteps of many forum posters here. I do not want to take any undue credit. Although I now understand why some people prefer to contract this out to others. It took a fairly substantial amount of time in planning and assembly.Your Mar 19th post is awesome!Post edited by drop1 on -
Looking good!- Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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