Replacing frozen vintage MW 6503

After great Input and help from Gardenstater and Boston 1450 decided to replace with aftermarket replacements, the originals have been discontinued for quite sometime . Spoke to Polk tech this morning, very helpful and confirmed not aware of any possible repair of old units,recommended parts express and Mid West speaker.Per Gardenstater’s suggestion looked at EBay but not comfortable with used given age and no returns too risky and too expensive for me.
Found Dayton DCA -160-8 on parts express their p/n 295-305 . Does anyone have an opinion on these?
Thanks

Comments

  • pitdogg2pitdogg2 Posts: 15,287
    edited January 13
    Yes the opinion is going to be buy used. We all have many times. Ask the seller to pack very well and you should be ok. I've bought about 10 mw drivers off ebay and have never had one show up seized. I'm not saying it can't happen but ebay will refund if it is no matter what the seller states.
  • And if you decide to go used, which is what I'd do as well, definitely pm the seller to confirm no voice coil rubbing sounds when dust cover/cone is depressed manually. In my experience they will usually respond and if they don't you can decide whether to take a chance anyway and rely on eBay return policies.
    George / NJ

    Polk 7B main speakers (1979, orig owner)
    Martin Logan Dynamo sub
    Crown D150 amp
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14 gauge, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
  • boston1450boston1450 Posts: 6,595
    I also have bought off Ebay with good results. Always ask ?'s about item & that it be packaged well for magnet shifting issues.... Charlie you messaged me pictures of your SL 2000 tweeter with a pushed in dome. You also stated there was some issue with the back of it & something fell off. Correct ? You also mentioned it was working now. Good.... You can probably use a tweeter with it pushed in. SHOULD you ever have to replace that tweeter I would "recommend" that you upgrade to Polk RD 0194 tweeters ( I think I heard Polk has those ? ) They are far better than the sl 2000 tweeters. If for some reason you have to replace 1 why not upgrade both to a far better sounding tweeters. Just some friendly advice.... You stated you bought these in the 80's (awesome) & after 30+ years I think you could easily enjoy them for another 20+ years........ Keep in mind the crossovers are old & tired. They may need refreshing soon. That is a whole different ballgame & that can of worms need not be opened now. There is a lot of good advice here. Dont hesitate to ask any question
    ...
    ...
    Randy / Maine
    SDA-CRS+ 198 tweeters. WMG upgraded crossovers.
    Larry's rings. Stands & Spiked nicely
    RTA15TL 198 tweeters. WMG upgraded crossovers.
    Larry's rings. Spiked nicely
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  • FaustinFaustin Posts: 910
    Is Lawdogg still repairing 65xx drivers?? Maybe send him a pm and ask
  • la2vegasla2vegas Posts: 3,943
    Faustin wrote: »
    Is Lawdogg still repairing 65xx drivers?? Maybe send him a pm and ask

    ^^Bingo.
  • ken brydsonken brydson Posts: 7,627
    Faustin wrote: »
    Is Lawdogg still repairing 65xx drivers?? Maybe send him a pm and ask

    He posted in another thread that he was too busy right now.
    HT/Main- Panny 50" G10 Plasma, Pioneer SC-1222k AVR, Panny DMP-BD60 BDP, Polk LS90 mains, CS350LS center, LS/fx side surrounds, LS50 surround backs, SVS 25-31PC+ sub, Harmony One

    Office Rig- Marantz 2252B, Denon 2910, Kenwood KD2070 TT, Polk RTA 12B's/ RTA8t
  • GardenstaterGardenstater Posts: 212
    edited January 13
    The two he is considering are:

    https://www.parts-express.com/dayton-audio-dc160-8-6-1-2-classic-woofer--295-305

    and

    https://www.midwestspeakerrepair.com/shop/home-audio/woofers/polk-audio-1/mw-audio-mw-6503-8-6-5-inch-polk-audio-copy-woofer/

    We would have to compare the Thiele Parameters with the ones for the MW6503, to see if the crossover in the Polks would be compatible and then you would also have to replace them in pairs, in my opinion, because it's highly unlikely that they wouldn't sound a bit different from the original Polk MW6503.
    George / NJ

    Polk 7B main speakers (1979, orig owner)
    Martin Logan Dynamo sub
    Crown D150 amp
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14 gauge, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
  • lawdogglawdogg Posts: 362
    Faustin wrote: »
    Is Lawdogg still repairing 65xx drivers?? Maybe send him a pm and ask

    He posted in another thread that he was too busy right now.

    Sorry I must have been drinking when posting (shocking, I know), I do have bandwidth for anyone in need.
    <3 my 3.1TLs

    I will fix your shifted magnets for free. :)
  • F1nutF1nut Posts: 43,385
    edited January 13
    The two he is considering are:

    https://www.parts-express.com/dayton-audio-dc160-8-6-1-2-classic-woofer--295-305

    and

    https://www.midwestspeakerrepair.com/shop/home-audio/woofers/polk-audio-1/mw-audio-mw-6503-8-6-5-inch-polk-audio-copy-woofer/

    We would have to compare the Thiele Parameters with the ones for the MW6503, to see if the crossover in the Polks would be compatible and then you would also have to replace them in pairs, in my opinion, because it's highly unlikely that they wouldn't sound a bit different from the original Polk MW6503.

    Neither of those are that close to the specs of the MW6503. Most notably the Fs of the MW5603 is 29Hz. The Dayton is 35.7Hz and the other is in the 50Hz range.
    Political Correctness'.........defined

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    President of Club Polk

  • @f1nut yes I noticed that. Definitely a deal breaker said I to self.
    George / NJ

    Polk 7B main speakers (1979, orig owner)
    Martin Logan Dynamo sub
    Crown D150 amp
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14 gauge, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
  • PeteB77PeteB77 Posts: 15
    Do you have the T&S specs for the original MW6503?
    Monitor Series RTA 8T Restored, Technics 1210, Xindak Pre/power amps
  • pitdogg2pitdogg2 Posts: 15,287
    edited January 14
    1 Driver Type Q BL Compliance DC Resistance Fs

    5 MW 6503 1.82 5.24 N 3.55 E - 3N/M 6.54 Ohms 29 Hertz
  • Driver: MW 6503 Driver's model #.
    Brand: Polk Driver's brand name.
    Fs: 29.8600 Hz (Free air resonance)
    Vas: 3.0017 ft^3 (Compliance volume)
    Qts: 0.3100 Total Q
    Qms: 1.7680 Mechanical Q
    Qes: 0.3760 Electrical Q
    Sd: 0.0130 M^2 (Piston area)
    Xmax: 3.1800 mm (Cone excursion, linear)
    Revc: 6.5400 ohms (DC resistance)
    Znom: 8.0000 ohms (Nominal impedance)
    Pmax: 35.0000 watts maximum rated power
    George / NJ

    Polk 7B main speakers (1979, orig owner)
    Martin Logan Dynamo sub
    Crown D150 amp
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14 gauge, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
  • PeteB77PeteB77 Posts: 15
    Thanks, let me think about those numbers.
    Has anyone looked at Misco drivers?
    Monitor Series RTA 8T Restored, Technics 1210, Xindak Pre/power amps
  • PeteB77PeteB77 Posts: 15
    There used to be an 8 ohm version of this driver, might work well if they get more:
    https://www.madisoundspeakerstore.com/approx-6-7-woofers/madisound-6102-4-6-polypropylene-cone-woofer/
    Monitor Series RTA 8T Restored, Technics 1210, Xindak Pre/power amps
  • PeteB77PeteB77 Posts: 15
    Has anyone tried to have Miller Sound repair a woofer?
    Monitor Series RTA 8T Restored, Technics 1210, Xindak Pre/power amps
  • halo71halo71 Posts: 4,420
    I have had some success repositioning shifted magnets in the past. Using a jig made of PVC pipe and thumb screws. Believe I found the plans for it on Audiokarma many years ago.
    --Gary--
  • PeteB77PeteB77 Posts: 15
    That jig is a great idea, I've seen pictures on AK.
    Monitor Series RTA 8T Restored, Technics 1210, Xindak Pre/power amps
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