Phase Plug design for MW65xx

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  • xschop
    xschop Posts: 5,000
    Be patient, I've got more modding to do. Mine and yours.
    Looks like a 4th set of M7's are about complete.

    It's now clear why there are so many closet-modders here.
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  • xschop
    xschop Posts: 5,000
    edited March 2023
    pitdogg2 wrote: »
    So curious, were the voice coils burnt or bad in any way?

    Another set of 6510's showed up with magnet shift. One so bad it severed the coil lead wire (on left). I was able to scrape the dust cap glue away, lift the wire up and over enough to get it repaired with fine tip soldering iron and Cardas Quad...
    Saved from the heap or trash-Bay...

    9y7j0goaypnq.jpg

    Back 100% Concentric...

    gwv4zj3vazab.jpg

    Post edited by xschop on
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  • xschop
    xschop Posts: 5,000
    edited March 2023
    ;)
    ufnimmxlqcvt.png
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  • xschop
    xschop Posts: 5,000
    edited March 2023
    Never posted this. Here's a fast way to remove a factory glued magnet without breaking it. Use exactly 0.500" alloy bar and gently wedge for pressure. Takes only 1 to 1.5min heating and you'll hear a distinct snap (Loc-Tite release). Let cool and pull magnet off by hand....

    l263xahygbd8.jpg

    zbtjw0r8t0x1.jpg

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  • gp4jesus
    gp4jesus Posts: 1,987
    W/all the skill of a brain surgeon… you’re the man Rob😊
    Samsung 60" UN60ES6100 LED Outlaw Audio 976 Pre/Pro Samsung BDP, Amazon Firestick, Phillips CD Changer Canare 14 ga - LCR tweeters inside*; Ctr Ch outside BJC 10 ga - LCR mids, inside* & out 8 ga Powerline: LR woofers, inside* & out *soldered LR: Tri-amped RTi A7 w/Rotels. Woofers - 980BX; Tweets & “Plugged*” Mids - 981, connected w/MP Premiere ICs Ctr Ch: Rotel RB981 -> Bi-amped CSi A6 Surrounds: Premiere ICs ->Rotel 981 -> AR 12 ga -> RTi A3. 5 Subs: Sunfire True SW Signature -> LFE & Ctr Ch; 4 Audio Pro Evidence @ the “Corners”. Power Conditioning & Distribution: 4 dedicated 20A feeds; APC H15; 5 Furman Miniport 20s *Xschop's handy work
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  • xschop
    xschop Posts: 5,000
    Cant remember the thread but someone just recently asked how to accomplish this exact problem.

    This particular driver was not mag- shifted but was too far out of concentricty for my taste. So set up on mag jig and punched pole-piece out and magnet stayed attached to base plate.
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  • skipshot12
    skipshot12 Posts: 1,157
    Ever since I jb welded the magnets on my SDA’s there’s something that has bothered my ocd grey matter…….

    I keep pondering whether I should have centered the magnets, of my MW’s, then do the jb weld gig!
    Would there be a noticeable difference in performance?
    Is there a negative to jb welding the magnets in place if they’ve shifted a tad but haven’t gotten to the point of the voice coil scraping.

    May be over thinking things but this is the stupid things a very anal/perfectionist deals with!
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  • bcwsrt
    bcwsrt Posts: 1,876
    What I've gathered on here is if you do the "push test" and things check out, you are good-to-go. Mine all checked out, so they are now set for eternity where they were at the time I J-B Weld-ed them (hopefully).

    Brian

    One-owner Polk Audio RTA 15TL speakers refreshed w/ Sonicap, Vishay/Mills and Cardas components by "pitdogg2," "xschop" billet tweeter plates and BH5 | Stereo REL Acoustics T/5x subwoofers w/ Bassline Blue cables | Rogue Audio Cronus Magnum III integrated tube amp | Technics SL-1210G turntable w/ Ortofon 2M Black LVB 250 MM cart | Sony CDP-508ESD CD player (as a transport) | LampizatOr Baltic 4 tube DAC | Nordost & DH Labs cables/interconnects | APC H15 Power Conditioner | GIK Acoustics room treatments | Degritter RCM
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  • xschop
    xschop Posts: 5,000
    edited March 2023
    Until your coils start rubbing on the baseplates due to the off-kilter pull of the mag flux gap. Your 6510's
    and 6511's are critical.

    See the 0.020" plastic shim wedged between the coil spud/jig and baseplate above? I have not found an out-of-concentric driver yet where the coil was not also relaxed/set too close to the base-plate, sometimes lightly rubbing. I use a hot air gun or blow dryer to heat and relax the coil away from the base plate ID to fix.
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  • skipshot12
    skipshot12 Posts: 1,157
    Aaaah, I see.
    Will sleep better tonight that I did good.
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  • xschop
    xschop Posts: 5,000
    7075 material finally showed up for the next phase of the phase-plug journey... Focus rings... 1.375 OD x 1.125 ID

    tigm128l18r3.jpg
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  • xschop
    xschop Posts: 5,000
    MW-6516 focus rings...

    hsyq3mfovewc.jpg


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  • Gardenstater
    Gardenstater Posts: 4,455
    I was reading this yesterday and found it interesting:

    https://speakerwizard.co.uk/driver-ts-parameters-xmax/

    pxua5siztyph.jpg


    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
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  • xschop
    xschop Posts: 5,000
    edited April 2023
    Very interesting phenomenon I observed. When I dropped the ring down into the VC gap, it went at about 1/3 speed of gravity.

    k67jlc0rv42a.jpg

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  • Gardenstater
    Gardenstater Posts: 4,455
    Very cool. The same thing happens if you drop a magnet down a copper pipe (or aluminum).
    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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  • Gardenstater
    Gardenstater Posts: 4,455
    It is discussed in this quora chat:

    https://www.quora.com/Are-copper-and-aluminum-though-not-magnetic-affected-by-magnetic-fields
    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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  • xschop
    xschop Posts: 5,000
    edited April 2023
    After lower area of Red Loc-Tite dries, I'll seep more Loc-Tite into the top between interstitial area of alloy ring and magnet,. I left @ .007 clearance for glue.

    cytv24dnnmyz.jpg

    BTW I confirmed on this extra set of 6516's that their magnets are different from all other MWs....
    1.30" ID
    3.425"OD
    0.540" thick

    xa4vctsopvwt.jpg
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  • xschop
    xschop Posts: 5,000
    edited April 2023
    Today I've been listening to a set of bone-stock 6516's in the right channel and this set with focus-rings only before I cut the caps off and phase plug.
    So far by ear I can say that the rings improve bass and mid-base speed/transition.

    s0zd6dk65d60.jpg

    updlu2zczn2c.jpg

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  • xschop
    xschop Posts: 5,000
    I've been moving the balance knob from left to right and they certainly are cleaner sounding all around.
    I switched speakers L-R and listened carefully to same tracks.
    I also did a blind test and wife picked out the ringed set as "better sounding voices"

    I don't hear any diminished output on the ringed set either compared to the un-ringed set.
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  • xschop
    xschop Posts: 5,000
    Now to phase-plug the ringed set...

    nociuzbeipag.jpg


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  • xschop
    xschop Posts: 5,000
    Ready for some fresh gaskets...

    c4my5i8e69me.jpg
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  • xschop
    xschop Posts: 5,000
    Already have some bass-heavy tracks that cannot bottom out or distort these at even the highest volumes.
    The bone-stock drivers are bottoming out and distorting voices at accompanying bass notes.

    Ironic that E-40's track Sideways, makes the stock MWs oscillate off axis at high SPL. The ringed, now ring/plugged drivers stay straight as an arrow on axis and the voices don't distort at all.

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  • Jazzhead
    Jazzhead Posts: 533
    xschop wrote: »
    I've been moving the balance knob from left to right and they certainly are cleaner sounding all around.
    I switched speakers L-R and listened carefully to same tracks.
    I also did a blind test and wife picked out the ringed set as "better sounding voices"

    I don't hear any diminished output on the ringed set either compared to the un-ringed set.

    Interesting how women can hear changes in the rig (supposedly women have greater hearing sensitivity, particularly high frequency). I was trying out a silver interconnect once, and had not mentioned it to my wife. She casually passed through the room, made a face and said "what did you do to it"?
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  • xschop
    xschop Posts: 5,000
    edited April 2023
    But she doesn't understand why I'm always listening to the same tracks/songs when tinkering with them.🤔
    She's just happy I don't build 500hp deathtraps anymore.
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  • Jazzhead
    Jazzhead Posts: 533
    hohd0o3j56ti.png
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  • plastic_avatar
    plastic_avatar Posts: 708
    I knew heavy steering when I got to drive a 79 whale tail and a fully-manual, base model beater Chevy S-10.

    Not much difference in ride nor feel on either below 25mph =P
    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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  • xschop
    xschop Posts: 5,000
    xschop wrote: »
    ;)
    ufnimmxlqcvt.png

    I made the ID's of the rings 1.16" final.
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  • xschop
    xschop Posts: 5,000
    edited April 2023
    Getting a jump on the right channel conversion.
    Found a very fast a thorough way of butyl mating the drivers whilst the magnets are off for realignment and ring insertion...
    More factory offset magnets I wouldn't trust anyway...


    gzkt87xu4wnd.jpg

    rks49a5ulvou.jpg

    as5czcm6ydfr.jpg

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  • plastic_avatar
    plastic_avatar Posts: 708
    Ohhhhhhh. Nice.
    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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  • xschop
    xschop Posts: 5,000
    jbo6h9a2itf0.jpg
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