Picked up a mint pair of SDA CRS +'s...I'd like to bring them back to their former glory, or better.

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  • 91rtstealth
    91rtstealth Posts: 102
    once I get those other crossovers I posted above, do I NOW have all the correct schematics below? If so, I'm going to try to learn how to read them properly.

    1. stock


    2. upgrade


    3. the step by step process of doing the upgrade

    u1ef9lv3d846.jpg


    are these all correct?

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  • billbillw
    billbillw Posts: 7,660
    Do you have soldering supplies? If you have never soldered before, there is a bit of learning that should be done before you ever take an iron to the crossovers.
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  • 91rtstealth
    91rtstealth Posts: 102
    that's the one thing I actually do know how to do..haha...I'm not the best, but I have a fair amount of experience....I used to install remote starts/alarms/keyless entry and stuff like that in cars for a living..so i've soldered a TON of wires...and I've rebuilt a few modules for my Dodge Stealths/Mitsubishi 3000GT's over the last 20 years....I built a Dynaco ST70 and a Bottlehead Tube Amp....I recapped some things before...so I do know how to solder and desolder enough to get by...so far, the ECU that I recapped in my 1991 Stealth has been working since 2001...haha...

    I just have no experience with working on the crossovers of these speakers...I've only ever did small stuff like replace tweeters and drivers, binding posts, dynamatting the baskets, etc...I never did any major work to their crossovers before...

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  • JayMX
    JayMX Posts: 457
    edited February 3
    91rtstealth wrote: »


    3. the step by step process of doing the upgrade

    u1ef9lv3d846.jpg


    The circuit diagram I marked up is ONLY applicable to modifying the 1986 version. If you acquire the newer pin/blade, single-board crossovers, then you should use the 4.1TL schematic as your reference to update to RD0198’s and 6510/6511 midwoofers. Forget the marked up diagram. It does not apply to the single-board crossovers.

    Current Collection: Monitor 4a (Peerless), Modified Monitor 7b (Peerless), RTA15TL (SL3000), Full mod SDA CRS 4.1TL (198’s), SDA SRS 2.3TL, R100's, R200’s, R300 🤩
    Pairs that have passed through: Monitor 4b (Peerless), Monitor 5a (Peerless), Monitor 5B (Peerless), Monitor 5b (SL1000), Monitor 5b (SL2000) (4x pair), Monitor 7b (Peerless), Modified Monitor 7c’s (194’s), Monitor 10a (Peerless), Monitor 10b (5x pair), RTA8, RTA8TL, RTA 11T, RTA12c (194's), SDA1(mod to “a” & SL1000 Wuhan mod), SDA CRS, SDA 2 (2x pair), SDA 2a, SDA 2b, SDA 1b, SDA 1c, SDA SRS 2 (2x pair), SDA SRS 3.1TL (198’s) (2x pair)...and more to come, it’s a sickness.
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  • 91rtstealth
    91rtstealth Posts: 102
    JayMX wrote: »
    91rtstealth wrote: »


    3. the step by step process of doing the upgrade

    u1ef9lv3d846.jpg


    The circuit diagram I marked up is ONLY applicable to modifying the 1986 version. If you acquire the newer pin/blade, single-board crossovers, then you should use the 4.1TL schematic as your reference to update to RD0198’s and 6510/6511 midwoofers. Forget the marked up diagram. It does not apply to the single-board crossovers.

    got it..thanks...seems like a done deal on getting those single board crossovers..I just gotta work out the shipping and payment with the guy, but you never know...i'll let ya'll know on here when or if I definitely get them...and on facebook...I'm sure i'll need help navigating that TL mod...I still need to get the tweeters and other components anyways..I gotta do it slowly...my work schedule is slow and I have entirely too many hobbies that cost money..I'd love to bang this out asap, but I gotta watch my spending right now...
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  • audioluvr
    audioluvr Posts: 5,965
    91rtstealth wrote: »
    alright...interesting turn of events...

    so this guy on Facebook has the following...he said I could have any of it for almost nothing...just shipping and a minimal fee...

    bw4qp7t6b0v9.jpg

    Those are the droids you are looking for.
    Gustard X26 Pro DAC
    Belles 21A Pre Upgraded with Mundorf Supremes
    B&K M200 Sonata monoblocks refreshed and upgraded
    Polk SDA 1C's modded / 1000Va Dreadnaught
    Wireworld Silver Eclipse IC's and speaker cables
    Harman Kardon T65C w/Grado Gold. (Don't laugh. It sounds great!)

    There is about a 5% genetic difference between apes and men …but that difference is the difference between throwing your own poo when you are annoyed …and Einstein, Shakespeare and Miss January. by Dr. Sardonicus
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  • audioluvr
    audioluvr Posts: 5,965
    Also see if the guy can glue the magnets for you so they don't arrive shifted or at the very least pack them extremely well (no bubble wrap). I use old paper bags crumpled up.
    Gustard X26 Pro DAC
    Belles 21A Pre Upgraded with Mundorf Supremes
    B&K M200 Sonata monoblocks refreshed and upgraded
    Polk SDA 1C's modded / 1000Va Dreadnaught
    Wireworld Silver Eclipse IC's and speaker cables
    Harman Kardon T65C w/Grado Gold. (Don't laugh. It sounds great!)

    There is about a 5% genetic difference between apes and men …but that difference is the difference between throwing your own poo when you are annoyed …and Einstein, Shakespeare and Miss January. by Dr. Sardonicus
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  • 91rtstealth
    91rtstealth Posts: 102
    Ahhh man. Bad news.

    The guy was mistaken. He sold the 6511’s and it’s the 6510’s that he has in storage. He just went to his storage unit and verified that he has 6510’s, NOT 6511’s. :(.

    I think I’m still going to take the crossovers and just run my 6510’s for now and see what it sounds like. I can’t imagine it’s going to be a HUGE difference. If so, I’ll try to get some 6511’s down the line.

    What do yall think?
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  • aprazer402
    aprazer402 Posts: 3,400
    edited February 4
    Not trying to confuse you even more, I also have the CRS+ 1986 blade/blade version w/stands.

    I bookmarked the following thread of Neil's 4.1TL conversion of his 1989 CRS+ PIN/blade.
    https://forum.polkaudio.com/discussion/137026/my-new-4-1tl-039-s-are-complete/p1

    Lots of great info. on it.

    I also have a pair of SDA 2A's blade/blade, with the same crossover as our 1986 CRS+.

    The cost to even recap these with two boards in each is a lot. Which is why I haven't considered it.
    I need to practice recapping on a smaller Polk, maybe a 7B, first to get it down better. It's been years.

    I'm thinking, when I get my 14' x 12' main floor den room ready, the CRS's might work well in there.
    I may just put new tweeters in them and see how that sounds.

    Great people here, get your learn on!

    Good luck and welcome to the forum!

    Edit: Sorry, I thought you were new here for some reason. ;)

    Post edited by aprazer402 on
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  • xschop
    xschop Posts: 5,224
    You can substitute the 6511’s with 6502’s. The trade off is a little less bass output, but better midrange. I’ve done it a few times myself.
    Don't take experimental gene therapies from known eugenicists.
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  • 91rtstealth
    91rtstealth Posts: 102
    edited February 4
    ok cool..i'm gonna get those crossovers from him and just run my 6510's for a while...i'll keep my eyes open for the correct 6511's...or the 6502's...

    anyone know anything about this "replacement" for the 6511?

    https://reconingspeakers.com/product/6-5-woofer-with-butyl-surround-4-ohm-6024/
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  • xschop
    xschop Posts: 5,224
    edited February 4
    I'd refrain. They have a 1.5" dia VC, and that dust cap is hideous.

    Contact @F1nut for some spare 6502's
    Don't take experimental gene therapies from known eugenicists.
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  • Conradicles
    Conradicles Posts: 6,350
    I may have something, I'll check...
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  • 91rtstealth
    91rtstealth Posts: 102
    Conradicles wrote: »
    I may have something, I'll check...

    sweet..thanks..

    also, Nice Z....I love those...not to work on, but everything else about them is great..haha..
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  • 91rtstealth
    91rtstealth Posts: 102
    crossovers are in the mail..should arrive later this week....

    what are ya'll's thoughts on these? is installing a phase plug in these a popular mod? i've never seen this, ever..

    https://ebay.com/itm/116818072269?chn=ps&mkevt=1&mkcid=28&google_free_listing_action=view_item
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  • plastic_avatar
    plastic_avatar Posts: 743
    You just activated the Shatstorm Response Network.

    [grabs galoshes and raincoat]

    [stares at horizon from under the brim of a giant, whale-blubber-treated sailor's hat]
    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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  • plastic_avatar
    plastic_avatar Posts: 743
    edited February 8
    I do like mine...

    ocp64l9pccvx.jpeg
    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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  • 91rtstealth
    91rtstealth Posts: 102
    plastic_avatar wrote: »
    You just activated the Shatstorm Response Network.

    [grabs galoshes and raincoat]

    [stares at horizon from under the brim of a giant, whale-blubber-treated sailor's hat]

    Looks cool, and generally phase plugs can be pretty helpful...

    is this something you did yourself, or is there someone specific out there online that makes them? I"m just curious since I never saw them before.
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  • plastic_avatar
    plastic_avatar Posts: 743
    Mine are @xschop beauties.

    The ones in the picture are from my 1C. I wanted to see how the sounded in the stereo slots of the CRS+.

    There's a bit of a hubbub because the people using them in stereo models have, to the best of my knowledge, loved them, but! Only 2 of us, to the best of my knowledge, tried them on SDA models; I liked them in my 1C, but Polk legend DarqueKnight did not like them in his CRS+.

    I'm up to mod any and all of these old Polks. I enjoy it. I've lucked out on my mods, so far, but am always prepared for failure.

    As some have said elsewhere, these parts are getting hard(er) to find. If you mod your own, be sure you want to do it =)

    If you're buying the mids already modded (to replace what's busted on yours, for a good price), go for it. I will say, I'm glad I have a set of modded and unmodded mids that fit both the 1C and the CRS+. I can compare how they sound. I'm still testing the arrangement to see what combo of plugged/unplugged I have in the 1C, but I do know at the very least) me-and-mine prefer the plugged mids on the stereo side.
    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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  • 91rtstealth
    91rtstealth Posts: 102
    cool..well thanks for the info. I didn't even know that was a thing people did to these speakers.

    I think for now I'm just going to run the 6510's that are currently in my CRS+'s, and keep my eyes out for some stock 6511's so I can A and B them with the 6510's to see what kind of differences I notice. First I need to get these crossovers, rdo198's, caps, and resistors get this project underway. If I find some 6511's at some point..cool..if not, i'll live.
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  • xschop
    xschop Posts: 5,224
    If that ebay ad was Ray Smith's 6511, then it is junk because the suspension is fubar.
    Don't take experimental gene therapies from known eugenicists.
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  • plastic_avatar
    plastic_avatar Posts: 743
    I wondered about that...
    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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  • Toolfan66
    Toolfan66 Posts: 18,117
    xschop wrote: »
    If that ebay ad was Ray Smith's 6511, then it is junk because the suspension is fubar.

    It is from his stash..
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  • xschop
    xschop Posts: 5,224
    plastic_avatar wrote: »
    Mine are @xschop beauties.

    The ones in the picture are from my 1C. I wanted to see how the sounded in the stereo slots of the CRS+.

    There's a bit of a hubbub because the people using them in stereo models have, to the best of my knowledge, loved them, but! Only 2 of us, to the best of my knowledge, tried them on SDA models; I liked them in my 1C, but Polk legend DarqueKnight did not like them in his CRS+.

    I'm up to mod any and all of these old Polks. I enjoy it. I've lucked out on my mods, so far, but am always prepared for failure.

    As some have said elsewhere, these parts are getting hard(er) to find. If you mod your own, be sure you want to do it =)

    If you're buying the mids already modded (to replace what's busted on yours, for a good price), go for it. I will say, I'm glad I have a set of modded and unmodded mids that fit both the 1C and the CRS+. I can compare how they sound. I'm still testing the arrangement to see what combo of plugged/unplugged I have in the 1C, but I do know at the very least) me-and-mine prefer the plugged mids on the stereo side.

    There are other plugged SDA's out there. A set of SRS-2's and a set of 2B's that I know of. I had my RTA-8TL's sideways, plugged, and SDA'd with CRS x-overs all year. I will be building another WAF-friendly tower set this summer with MTM configuration (think mini 3.1tl's).

    Hey Steven, you should try a plugged 6502 in the SDA slot as well and tell us what you think.

    Don't take experimental gene therapies from known eugenicists.
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  • plastic_avatar
    plastic_avatar Posts: 743
    I was tired. I always forget about your awesome customs and the unknown-to-me others!

    6502... [thinking]... I'm flush with 6503 in my M12...

    If I get the 5B back from Dad, I'll swap and listen. I do have one 6502 with the 3D-printed test plug copy...
    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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