What should I do (or what would you do)?

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  • turkeyaddict
    turkeyaddict Posts: 12
    edited February 2022
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    One of the voice coils in a mw6500 for my 7b is shot - ohms at infinity - any chance you want to sell some of your 'spare parts'?
    Post edited by turkeyaddict on
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  • pitdogg2
    pitdogg2 Posts: 24,635
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    They pop up on eBay. save a search.
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  • wispolkboy
    wispolkboy Posts: 149
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    turkeyaddict wrote: »
    One of the voice coils in a mw6500 for my 7b is shot - ohms at infinity - any chance you want to sell some of your 'spare parts'?

    Well since 4 of my speakers take mw6500 I really don't want to sell my 2. I have one that I replaced with a close match but I don't recall what mw65xx it is, maybe someone knows off hand. It's in one of my m4a.
    I wish you luck in finding one.
    M7's 1982 Peerless tweeters
    M5's X2 (1981 Peerless tweeters, 1988 with upgraded tweeters)
    M4's X2 both with Peerless tweeters
    M5Jr with SL1500 (in the garage, they sound great)
    M4.6 series2 X2 with upgraded tweeters
    SDA 2 with upgraded tweeters
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  • wispolkboy
    wispolkboy Posts: 149
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    turkeyaddict wrote: »
    One of the voice coils in a mw6500 for my 7b is shot - ohms at infinity - any chance you want to sell some of your 'spare parts'?

    Don't know where you are but this single m10 probably has a mw6500
    M7's 1982 Peerless tweeters
    M5's X2 (1981 Peerless tweeters, 1988 with upgraded tweeters)
    M4's X2 both with Peerless tweeters
    M5Jr with SL1500 (in the garage, they sound great)
    M4.6 series2 X2 with upgraded tweeters
    SDA 2 with upgraded tweeters
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  • wispolkboy
    wispolkboy Posts: 149
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    You could probably have the guy part them out and ship the guts to you....
    M7's 1982 Peerless tweeters
    M5's X2 (1981 Peerless tweeters, 1988 with upgraded tweeters)
    M4's X2 both with Peerless tweeters
    M5Jr with SL1500 (in the garage, they sound great)
    M4.6 series2 X2 with upgraded tweeters
    SDA 2 with upgraded tweeters
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  • wispolkboy
    wispolkboy Posts: 149
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    https://chicago.craigslist.org/chc/msg/d/chicago-polk-audio-10-monitor-speakers/7449542117.html
    M7's 1982 Peerless tweeters
    M5's X2 (1981 Peerless tweeters, 1988 with upgraded tweeters)
    M4's X2 both with Peerless tweeters
    M5Jr with SL1500 (in the garage, they sound great)
    M4.6 series2 X2 with upgraded tweeters
    SDA 2 with upgraded tweeters
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  • wispolkboy
    wispolkboy Posts: 149
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    My mistake, it's for a pair. Now you can have spares... With Peerless tweeters...
    M7's 1982 Peerless tweeters
    M5's X2 (1981 Peerless tweeters, 1988 with upgraded tweeters)
    M4's X2 both with Peerless tweeters
    M5Jr with SL1500 (in the garage, they sound great)
    M4.6 series2 X2 with upgraded tweeters
    SDA 2 with upgraded tweeters
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  • DaveHo
    DaveHo Posts: 3,481
    edited February 2022
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    If I owned the Peerless lineup you have, given my current list of projects, I'd stash them away for parts. Unless you are interested in experimenting with the original cabinet design, you have nothing to gain. I don't see a need to build a pair just to compare them to the 7s.
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  • turkeyaddict
    turkeyaddict Posts: 12
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    Thanks for the advice all. I found a local shop willing to sell me a lone mw6502 for $30. I'm simply going to install and have a mismatched pair while I keep looking for another m6500...
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  • Gardenstater
    Gardenstater Posts: 4,207
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    turkeyaddict wrote: »
    Thanks for the advice all. I found a local shop willing to sell me a lone mw6502 for $30. I'm simply going to install and have a mismatched pair while I keep looking for another m6500...

    Not to be negative but that is going to be a horrific mismatch. The 6502 is 4 ohm nom. impedance and 6500 is 8.

    https://forum.polkaudio.com/discussion/133992/thiele-small-parameters-for-mw6500-drivers#latest
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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  • westmassguy
    westmassguy Posts: 6,850
    edited February 2022
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    Gardenstater wrote: »
    turkeyaddict wrote: »
    Thanks for the advice all. I found a local shop willing to sell me a lone mw6502 for $30. I'm simply going to install and have a mismatched pair while I keep looking for another m6500...

    Not to be negative but that is going to be a horrific mismatch. The 6502 is 4 ohm nom. impedance and 6500 is 8.

    https://forum.polkaudio.com/discussion/133992/thiele-small-parameters-for-mw6500-drivers#latest

    You're better off with a 6503 or 6510. Do not install the 6502. That local shop should be ashamed for selling it.
    Home Theater/2 Channel:
    Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
    Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
    Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
    Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
    Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer

    dhsspeakerservice.com/
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  • xschop
    xschop Posts: 4,730
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    Let me know if you want to get rid of the burnt 6500.
    Don't take experimental gene therapies from known eugenicists.
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  • wispolkboy
    wispolkboy Posts: 149
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    xschop wrote: »
    Let me know if you want to get rid of the burnt 6500.

    I have a 6500 that is jb welded. There is a scratching in the voice coil. Is it something that can be repaired?
    M7's 1982 Peerless tweeters
    M5's X2 (1981 Peerless tweeters, 1988 with upgraded tweeters)
    M4's X2 both with Peerless tweeters
    M5Jr with SL1500 (in the garage, they sound great)
    M4.6 series2 X2 with upgraded tweeters
    SDA 2 with upgraded tweeters
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  • xschop
    xschop Posts: 4,730
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    Indeed. We're currently deciphering the 6500 enigma in the magnet jig/repair thread...

    https://forum.polkaudio.com/discussion/195928/forum-member-mw-magnet-repair-tool-set/p3
    Don't take experimental gene therapies from known eugenicists.
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  • wispolkboy
    wispolkboy Posts: 149
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    xschop wrote: »
    Indeed. We're currently deciphering the 6500 enigma in the magnet jig/repair thread..repair-tool-s

    Great, I would be very interested in that
    Please let me know where to send and how much.
    M7's 1982 Peerless tweeters
    M5's X2 (1981 Peerless tweeters, 1988 with upgraded tweeters)
    M4's X2 both with Peerless tweeters
    M5Jr with SL1500 (in the garage, they sound great)
    M4.6 series2 X2 with upgraded tweeters
    SDA 2 with upgraded tweeters
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  • xschop
    xschop Posts: 4,730
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    I will be doing the uber mods to the ones I start collecting and rebuilding, but I will post a how-to thread soon.
    Don't take experimental gene therapies from known eugenicists.
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  • Hansvelton
    Hansvelton Posts: 151
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    westmassguy wrote: »
    Gardenstater wrote: »
    turkeyaddict wrote: »
    Thanks for the advice all. I found a local shop willing to sell me a lone mw6502 for $30. I'm simply going to install and have a mismatched pair while I keep looking for another m6500...

    Not to be negative but that is going to be a horrific mismatch. The 6502 is 4 ohm nom. impedance and 6500 is 8.

    https://forum.polkaudio.com/discussion/133992/thiele-small-parameters-for-mw6500-drivers#latest

    You're better off with a 6503 or 6510. Do not install the 6502. That local shop should be ashamed for selling it.


    I am surprised, as long as the Vintage Polk Mid-woofers have been around, that someone does not have in depth T/S parameters for Every variation made back then.
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  • xschop
    xschop Posts: 4,730
    edited March 2022
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    1 Driver Type Q BL Compliance DC Resistance Fs

    3 MW 6501 1.470 5.96 N 3.250 E - 3N/M 7.750 Ohms 31 Hertz
    4 MW 6502 1.970 5.16 N 1.470 E - 3N/M 3.520 Ohms 44 Hertz
    5 MW 6503 1.820 5.24 N 3.550 E - 3N/M 6.540 Ohms 29 Hertz
    6 MW 6509 2.100 4.57 N 3.540 E - 3N/M 8.970 Ohms 30 Hertz
    7 MW 6510 1.390 6.32 N 3.410 E - 3N/M 6.570 Ohms 31 Hertz
    8 MW 6511 1.405 4.34 N 3.496 E - 3N/M 3.130 Ohms 29 Hertz
    9 MW 6512 1.905 4.99 N 1.588 E - 3N/M 3.466 Ohms 40 Hertz

    6500's and 6516's are unknown.
    Don't take experimental gene therapies from known eugenicists.
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  • Gardenstater
    Gardenstater Posts: 4,207
    edited March 2022
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    That list ^^ doesn't have the 6500, but we have this, which doesn't have BL or Compliance. Very curious where these data come from. If we had access to testing equipment like @DarqueKnight has, we could come up with *some* of the missing TS parameters, and verify some of the others.

    Driver: MW 6500 Driver's model #.
    Brand: Polk Driver's brand name.
    Fs: 31.0000 Hz (Free air resonance)
    Vas: 2.6486 ft^3 (Compliance volume)
    Qts: 0.2190 Total Q
    Qms: 1.3000 Mechanical Q
    Qes: 0.2640 Electrical Q
    Sd: 0.0130 M^2 (Piston area)
    Xmax: 3.1800 mm (Cone excursion, linear)
    Revc: 6.5000 ohms (DC resistance)
    Znom: 8.0000 ohms (Nominal impedance)
    Pmax: 35.0000 watts maximum rated power
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
    · Share on FacebookShare on Twitter