Summing up SDA SRS mods so far.

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gregmoyers
gregmoyers Posts: 142
in Vintage Speakers
I started poking around with my original sda srs’s that I bought new in 1987 from the audio/photo store on Yakota AFB. When I was….well, very young. The only thing I ever did with them over the past 36 years is enjoy them. I’ve had several different amps and sources put to them all top notch gear but just in the last year I got interested in finding out what could be done to make them better and more up to date. I started with tweeters which I had replaced about 25 years ago. I had 3 blown 2000’s so I called Polk. They sent me 8 SL2500’s. Don’t ask. I don’t know. I listened to them until recently when I started talking to Dave at DHS Speaker and he’s like “WHAT?” I could not order the 0194’s fast enough! I am now hooked into how awesome these things can be with some love , time and money. Thanks to the wealth of knowledge and expertise through this forum I started. I have had some misshaps along the way, starting posting…all over the place🥴 and now after learning a ton from all you folks am all sorted out and moving forward.
So far I have finished the following.
Rebuilt the stock binding cups with new posts and Speakon for sda interconnect.
Replaced tweeters with RD0194’s
Re sealed all drivers
Dynomat all drivers and PR
Replaced SDA inductors with low dcr Jantzen Coils.
Removed polyswitch’s
Results are very positive but the biggest impact is the Jantzen C coils.
I’m so stoked that I retired my Nak Pa7 for a pristine Threshold S500e.
I am going to start building new crossover’s very soon and can’t wait to hear the results!
Cheers and thanks to the many who have helped!
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  • gregmoyers
    gregmoyers Posts: 142
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    Correction
    S550e.
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  • plastic_avatar
    plastic_avatar Posts: 747
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    Got pictures of your build?
    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 * custom 5B on a system for my Dad * Ye Olde college stereo in the garage
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  • gregmoyers
    gregmoyers Posts: 142
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    Haven’t started the crossover’s yet. Here are cups and inductor mounting.ayk6d5ek6rmy.jpeg
    ivn127rh6o84.jpeg
    tdn4aa465xcc.jpeg
    jvo5dmyqldl7.jpeg
    up7oqikgurgx.jpeg
    qxcx2urvjnzb.jpeg
    6a8bqi7soe27.jpeg
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  • gregmoyers
    gregmoyers Posts: 142
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    Update: ordered all crossover parts
    Clarity, solen, Path, Mills. Will start figuring out a direct connect board for the low pass caps.
    While they’re apart I’ll put BH5 in. Stay tuned.
    Film at 11.
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  • Schurkey
    Schurkey Posts: 2,130
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    I'm not wearing any pants.
    gregmoyers wrote: »
    Film at 11.
    https://www.youtube.com/watch?v=-ht_yD2cfO0&ab_channel=TheBarryM8

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  • gregmoyers
    gregmoyers Posts: 142
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    cbl3c8zkxz44.jpeg
    6mz1x4fdazdu.jpeg
    71yzj7i7eivr.jpeg
    pg8mayu5d192.jpeg
    f67m4p2eihn7.jpeg
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  • VR3
    VR3 Posts: 29,751
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    I would highly recommend changing the tweeter internal wiring at. A minimum
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • skipshot12
    skipshot12 Posts: 2,156
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    Damn nice job.

    Trey, why the recommend on the tweeter wiring?
    That’s something I did not do, curiosity.
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  • VR3
    VR3 Posts: 29,751
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    The tweeter wiring on the original sda srs is beyond life expectancy. The insulation is even turning to goo in the ones I have seen. Nasty wire
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • F1nut
    F1nut Posts: 52,406
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    skipshot12 wrote: »
    Damn nice job.

    Trey, why the recommend on the tweeter wiring?
    That’s something I did not do, curiosity.

    All your chassis wire has turned green, replace all of it.
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  • skipshot12
    skipshot12 Posts: 2,156
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    Is there any reason to replace if there’s no oxidation… turning green?
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  • Schurkey
    Schurkey Posts: 2,130
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    skipshot12 wrote: »
    Is there any reason to replace if there’s no oxidation… turning green?
    If copper is green...it's oxidized.

    There was a time--thirty years ago or more--when Monster Cable had problems with this. They claimed it did not affect the sound...but they also replaced all the green stuff with fresh copper-colored wire as a "warranty" item.
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  • F1nut
    F1nut Posts: 52,406
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    skipshot12 wrote: »
    Is there any reason to replace if there’s no oxidation… turning green?

    All I see is oxidized.
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  • skipshot12
    skipshot12 Posts: 2,156
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    Mine look like new, not gonna mess with it.
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  • F1nut
    F1nut Posts: 52,406
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    Yours
    cyzx35rx7zot.png

    What new looks like
    mr5eeiv1nbbx.jpeg


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  • VR3
    VR3 Posts: 29,751
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    To be fair the one pictures belongs to @gregmoyers but I would say out of all the sda srs tweeter wiring I've seen.. Greg's the best looking and well.. There ya go
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • skipshot12
    skipshot12 Posts: 2,156
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    Dang it F1, you went and done it….
    Need to take out some tweets and have a closer look.
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  • F1nut
    F1nut Posts: 52,406
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    skipshot12 wrote: »
    Dang it F1, you went and done it….
    Need to take out some tweets and have a closer look.

    Don't replace any clear jacketed cable with new clear jacketed cable as one never knows the quality of the jacket. Some have a chemical reaction between the plasticiser and the copper causing the copper to corrode/oxidize, while others do not. It's not worth chancing.
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  • skrol
    skrol Posts: 3,493
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    Example of the big green monster cable.
    fdftjybzgptx.jpeg
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade), Parasound: P/LD-1100, HCA-1000A; Denon: DVD-2910, DRM-800A; Benchmark DAC1, Monster HTS3600-MKII, Grado SR-225i; Technics SL-J2, Parasound PPH-100.

    HT:
    Marantz SR7010, Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S4, CS250, PSW110 , Marantz UD5005, Pioneer PL-530, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, AVR-888, DCD-660, DRM-700A, DRR-780; Polk: S8, Monitor 5A, 5B, TSi100, RM7, PSW10 (DXi104 upgrade); Pioneer: CT-6R; Onkyo CP-1046F; Ortofon OM5E, Marantz: PM5004, CD5004, CDR-615; Parasound C/PT-600, HCA-800ii, Sony CDP-650ESD, Technics SA 5070, B&W DM601
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  • Unknown
    Unknown
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  • VR3
    VR3 Posts: 29,751
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    thats a unique boutique feature called patina and is highly desirable.

    New York even has a statue featuring this on display for all of the world to see!
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • Unknown
    Unknown
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  • skipshot12
    skipshot12 Posts: 2,156
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    F1nut wrote: »
    skipshot12 wrote: »
    Dang it F1, you went and done it….
    Need to take out some tweets and have a closer look.

    Don't replace any clear jacketed cable with new clear jacketed cable as one never knows the quality of the jacket. Some have a chemical reaction between the plasticiser and the copper causing the copper to corrode/oxidize, while others do not. It's not worth chancing.

    F1, what I’m understanding from the above is…..
    If I end up having to replace the wires I shouldn’t use clear jacketed wire, is that correct?
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  • Unknown
    Unknown
    edited February 2024
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    This content has been removed.
  • F1nut
    F1nut Posts: 52,406
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    Correct
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