Sda 1b help

Dusty B
Dusty B Posts: 28
edited June 2014 in Vintage Speakers
Polk sda 1b replacement midbass 6509
How are the polk replacement drivers For the 6509? Any body here try the RD 6528-1 replacement. How do they Compared to originals? I have a pair of sda 1b's with a couple of shifted magnets by the way. Do they look the same? Sound the same?
Thanks in advance for any replies. Just want to make sure before I pull the trigger on these. I might try to fix the originals regardless. Yes I've investigated the threads regarding repair. Picked up these sda 1bs at goodwill always wanted to try a pair. The price was right.......$10.00
Sry if I posted this a couple times. Learning
Post edited by Dusty B on
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  • pitdogg2
    pitdogg2 Posts: 25,441
    edited June 2014
    keep an eye on ebay they pop up often. I'd epoxy all the magnets before you lose more.
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  • pitdogg2
    pitdogg2 Posts: 25,441
    edited June 2014
    Current Production Drivers - Vintage Support

    These are the only drivers, aside from the RD tweeters, being manufactured to support vintage products, such as, Monitor, RTA and SDA. You should print this as a reference and keep it handy for the values it contains. There are no grill parts, cables, crossovers, plates or anything else available for the older loudspeakers, unless you know the Polk G O D.

    1 Driver Type Q BL Compliance DC Resistance Fs

    3 MW 6501 1.47 5.96 N 3.25 E - 3N/M 7.75 Ohms 31 Hertz
    4 MW 6502 1.97 5.16 N 1.47 E - 3N/M 3.52 Ohms 44 Hertz
    5 MW 6503 1.82 5.24 N 3.55 E - 3N/M 6.54 Ohms 29 Hertz
    6 MW 6509 2.1 4.57 N 3.54 E - 3N/M 8.97 Ohms 30 Hertz
    7 MW 6510 1.39 6.32 N 3.41 E - 3N/M 6.57 Ohms 31 Hertz
    8 MW 6511 1.405 4.34 N 3.496 E - 3N/M 3.13 Ohms 29 Hertz
    9 MW 6512 1.905 4.99 N 1.588 E - 3N/M 3.466 Ohms 40 Hertz
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  • Dusty B
    Dusty B Posts: 28
    edited June 2014
    Yes already in the plans. I have my eye on eBay too. Nothing on there now though
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  • Dusty B
    Dusty B Posts: 28
    edited June 2014
    Yes I've seen that list question was do they look the same and sound the same... Materials the same? Was hoping somebody had experience with the replacements. Thanks again for the help
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  • pitdogg2
    pitdogg2 Posts: 25,441
    edited June 2014
    Dusty B wrote: »
    Yes I've seen that list question was do they look the same and sound the same... Materials the same? Was hoping somebody had experience with the replacements. Thanks again for the help

    Yes they sound the same. The only difference is you see the voice coil leads on the old by the dust cap. The new will cover those so the dust cover is slightly bigger other than that I have used both 6501 new and old sound the same to my ears. Many have been happy with them. Get a new one and keep eyes open on eBay, BUT you could end up in the same boat IF they get banged around in shipping. I have asked the sellers to pack really well and tape the snot out of the magnet to keep from shifting but in reality its just luck in the end....
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  • PolkieMan
    PolkieMan Posts: 2,446
    edited June 2014
    What kind of Goodwills do you have?
    If I even found a pair and then for $40 I would totally freak.
    They look the same except the voice coil wires don't show.
    Club Polk $48 each free shipping last time I checked
    Dusty B wrote: »
    Polk sda 1b replacement midbass 6509
    How are the polk replacement drivers For the 6509? Any body here try the RD 6528-1 replacement. How do they Compared to originals? I have a pair of sda 1b's with a couple of shifted magnets by the way. Do they look the same? Sound the same?
    Thanks in advance for any replies. Just want to make sure before I pull the trigger on these. I might try to fix the originals regardless. Yes I've investigated the threads regarding repair. Picked up these sda 1bs at goodwill always wanted to try a pair. The price was right.......$10.00
    Sry if I posted this a couple times. Learning
    POLK SDA 2.3 TLS BOUGHT NEW IN 1990, Gimpod/Sonic Caps/Mills RDO-198
    POLK CSI-A6 POLK MONITOR 70'S ONKYO TX NR-808 SONY CDP-333ES
    PIONEER PL-510A SONY BDP S5100
    POLK SDA 1C BOUGHT USED 2011,Gimpod/Sonic Caps/Mills RDO-194
    ONKYO HT RC-360 SONY BDP S590 TECHNICS SL BD-1
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  • pitdogg2
    pitdogg2 Posts: 25,441
    edited June 2014
    PolkieMan wrote: »
    What kind of Goodwills do you have?

    No kidding!!! the only thing I have found in our local GW are tons and tons of Christmas albums by "you name it" most 50yrs old if a day and SMELL like a filthy moldy basement hurts my nose just standing close to them. Only audio stuff I've ever seen was top of the line goldstar VCR's and 35yr old TV's about the size of 9".....ours must totally suck
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  • Dusty B
    Dusty B Posts: 28
    edited June 2014
    The good goodwill I guess. I just got lucky on this one. Usually just crap. That same day I picked up LCR Atlantic technology there as we'll for 20 A grand total of 30 bucks for everything. I thought I was gonna have a heart attack
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  • Dusty B
    Dusty B Posts: 28
    edited June 2014
    Ok thank you, very helpful. I will order the replacements. I still wish I could salvage the original 1987 marked woofers.... Way hard to get the voice coil gap perfect. I commend anybody who has been able to salvage these. If anybody is interested in the old drivers let me know.
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  • Dusty B
    Dusty B Posts: 28
    edited June 2014
    Time to pull out the jb weld ok don't lose any more drivers. Btw the stupid lady at good will insisted on carrying one to the counter and dropped it....... It hurts because I checked and all drivers were working before the mishap.
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  • Dusty B
    Dusty B Posts: 28
    edited June 2014
    Any recommendations other then j b weld?
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  • pitdogg2
    pitdogg2 Posts: 25,441
    edited June 2014
    Dusty B wrote: »
    Ok thank you, very helpful. I will order the replacements. I still wish I could salvage the original 1987 marked woofers.... Way hard to get the voice coil gap perfect. I commend anybody who has been able to salvage these. If anybody is interested in the old drivers let me know.

    yes you can make a jig to re-align. Some here have done it BUT with drivers still available from Polk and with them showing up on eBay often you have to ask if making the jig and your time are worth the effort to still have a driver that might be worse off than new. Your call
    Go out to google and you will get :

    http://www.polkaudio.com/forums/showthread.php?87460-MW6510-shifted-magnet-repair

    http://www.audiokarma.org/forums/showthread.php?t=202963

    http://www.polkaudio.com/forums/showthread.php?147091-My-new-speaker-jig

    http://www.polkaudio.com/forums/showthread.php?109776-Frozen-6511-in-SDA-1C-s


    any strong metal epoxy will work better than nothing some have used the putty that you meld together with your hands then apply to magnet and walla
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  • Dusty B
    Dusty B Posts: 28
    edited June 2014
    Yea I agree with you on that I've seen the jig and how it's done. I just don't think I would do it, the margin for error is very small and time consuming. I might just order the rdo 194 at the same time and do the crossovers while I'm waiting.
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  • pitdogg2
    pitdogg2 Posts: 25,441
    edited June 2014
    Dusty B wrote: »
    Yea I agree with you on that I've seen the jig and how it's done. I just don't think I would do it, the margin for error is very small and time consuming. I might just order the rdo 194 at the same time and do the crossovers while I'm waiting.

    Not to mention when new the magnet is not magnetized until AFTER it is attached to the basket...So I have always wondered if the "flux" of the magnet will now be different when re-attached....Things that make you go HMMMM:) After all you do now have two opposing magnets you need to get right Ever tried to glue two magnets to opposing ends?
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  • Dusty B
    Dusty B Posts: 28
    edited June 2014
    It's not easy almost imposible I fact to get it right. Things shift and change not to mention me banging on it with the hammer to try and get it centered.... Possible to change the magnetic field. New drivers are the way to go it seems 48 bucks just gotta break them in slow. I'll keep my eye out for the vintage ones on the bay though. I like to keep the grills off and would like them to look the same.
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