Questions on SDA SRS 2 Pin/Blade - crossovers, polyswitch and tweeter upgrades, mono blocks

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jmardy
jmardy Posts: 27
in Vintage Speakers
I picked these up recently and have been quite impressed so far.
I've ordered hurricane nuts, PE gasket tape and am going to dynamat the baskets.

Is that little blue sucker next to the input header and above the yellow cap the polyswitch?

I'm running them with a pair of Kenwood L-05M mono-blocks with their ground terminals on the back of the amps connected. Is that OK?

RD0-194s are still the preferred drop in upgrade?

If I didn't want to go "all in" with crossover upgrades, what would you replace?

Thanks in advance. I know a lot of this is dead horse territory but not a lot of the discussions seem to cover the later pin/blade SRS2's.ogh118cjahtl.jpg

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  • F1nut
    F1nut Posts: 52,407
    edited January 18
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    If the stock gaskets are not damaged leave them alone. You gain nothing but a headache changing them unnecessarily.

    The blue device is the polyswitch. Remove and replace with a 0.5 ohm 10 or 12 watt Vishay-Mills resistor.

    Some mono blocks can be strapped and some cannot. I don't know about yours. Best bet is to build a Dreadnought.

    RD0194-1 tweeters are drop in.

    Either do all the caps and resistors or do nothing.


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  • jmardy
    jmardy Posts: 27
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    Thanks F1.
    Much appreciated.
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  • xschop
    xschop Posts: 5,820
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    What F1nut suggested, but don't forget the PR push test after you've buttoned everything back up. This is the true test of gasket integrity.
    Don't take experimental gene therapies from known eugenicists.
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  • jmardy
    jmardy Posts: 27
    edited January 18
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    This seems kinda interesting, one channel has a 4.4uf 250V, the other has a 4.4uf100V and looks to have had a piggyback added and removed at some point.

    Since they're out now, I might as well replace them.

    So the two yellow caps on each board, I replace with the same value Sonicap?

    And I've found Mills 10w 7.5 resistore and Vishay Mills 5W 2.7 Ohm Vishay Mills MRA-5
    Sound like a plan?

    Oh geez, here I go... :D
    6gy5sbhw4zvf.jpg
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  • F1nut
    F1nut Posts: 52,407
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    If you think replacing only the 4.4uF caps is the way to go you would be sadly mistaken.
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  • xschop
    xschop Posts: 5,820
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    All those caps are fubar.
    Don't take experimental gene therapies from known eugenicists.
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  • jmardy
    jmardy Posts: 27
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    I'm replacing all the caps and resistors (and the polyswitch).
    Thanks for all the help!
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  • F1nut
    F1nut Posts: 52,407
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    Good man. Do not use Solen, Dayton or Bennic caps.
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  • jmardy
    jmardy Posts: 27
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    I can't find any film caps to replace the two electrolytics (20uf and 40uf) that will come anywhere close to fitting. Will sadness ensue if I just replaced them with electrolytics?
    Or does anyone have any suggestions?
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  • F1nut
    F1nut Posts: 52,407
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    You have to get creative. Search here for examples of the countless upgraded crossover examples.
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  • jmardy
    jmardy Posts: 27
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    Got them done finally.

    f4n8fphsu9p0.jpeg

    Did my old 5A's while I was at it:
    ot1tvzs18i3s.jpeg
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  • F1nut
    F1nut Posts: 52,407
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    How's the sound?
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  • jmardy
    jmardy Posts: 27
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    I kind of suck at describing sound, it’s like trying to describe wine for me but the whole “veil lifted “ cliché seems to fit. They sound… silkier?

    I’m still working on Dynamatting the PR‘s and installing hurricane nut so I haven’t really pushed them yet.

    The 5a’s were a similar improvement.
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  • F1nut
    F1nut Posts: 52,407
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    There ya go B)
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  • skipshot12
    skipshot12 Posts: 2,155
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    Nice
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  • jmardy
    jmardy Posts: 27
    edited January 30
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    Got them back together and played Paul Simon Graceland.
    The female vocals on "I know what I know" don't make me want to turn it down anymore.
    Same with the horns (woodwinds?) on "Crazy Love II" and "Gumboots"

    My watch told me it was too loud. I disagree.
    What?
    I SAID MY WATCH...

    My drum test tracks "Posters" by Dada and "Fool in the Rain" by Led Zeppelin sound fantastic. So tight and clean.

    I can't imagine them sounding better but tempted to drop another $250 on RD0-194's because that what all the cool kids have. :D
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  • jmardy
    jmardy Posts: 27
    edited January 30
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    Thanks @pitdogg2
    I'm confused that some vendors call them SL2000:
    (and are those the ones to get?)
    https://www.midwestspeakerrepair.com/product/polk-audio-sl2000-1-inch-dome-tweeter/

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  • skipshot12
    skipshot12 Posts: 2,155
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    ^Yep, that’s the one’s you want.
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  • jmardy
    jmardy Posts: 27
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    Thanks again @pitdogg2!
    Ordered from Polk. Set of four $192 plus tax, free shipping.
    SWEET!
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