Remember to epoxy your woofer magnets!
Comments
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Epoxying magnets is FUN!
my 3.1TLs
I will fix your shifted magnets for free.
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Don't take experimental gene therapies from known eugenicists. -
The 5.75" dimension needs to match the hand tool guide OD as a slip-fit tolerance. The extra length I put on the cylinder allows the guide tool to seat fully and center before magnet sets. The 1/2" diameter thru-hole needs to be there to relieve the internal pressure or the cone will blow-out.
Don't take experimental gene therapies from known eugenicists. -
I think you are on the right track with this, question what part will center the pole piece?Yamaha RXA1030, Yamaha CD-S2100, Yamaha AS-2200, Bluesound node 2i
Polk SDA2btl highly modded
Polk SDA 1C modded
Polk CS350 LS x2
Kimber 8TC
Sony 55" Bravia
Wish list SVS sub -
Be sure to observe proper magnet polarity when re-assembling, otherwise the woofer will be out of phase.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/ -
Randy, I believe the small hole in the back plate is the factory lathe turn center which would be concentric to the guidepost. It's 0.375 diameter on all ones I measured. It tapers at @ 0.200 depth so 0.175" length is the guide pin on above hand tool drawing. I would make the hand tool out of 4130 or 1018 steel so the magnet and back plate self stick to it after they are glued in first step.Don't take experimental gene therapies from known eugenicists.
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Ok I see what you mean, that should work.Yamaha RXA1030, Yamaha CD-S2100, Yamaha AS-2200, Bluesound node 2i
Polk SDA2btl highly modded
Polk SDA 1C modded
Polk CS350 LS x2
Kimber 8TC
Sony 55" Bravia
Wish list SVS sub -
WMG, which way is N & S in relation to front and back plates?
Is it not also imperative that the magnet ID be set 100% concentric to the guide post OD or the voice coil will have an off-axis pull when current is run?Don't take experimental gene therapies from known eugenicists. -
I doubt there are markings on the magnets, just hold one over an unmolested Polk woofer. If it attracts, its positioned right, if it repels, it's reversed.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/ -
Dave is there anything you don't know!!Yamaha RXA1030, Yamaha CD-S2100, Yamaha AS-2200, Bluesound node 2i
Polk SDA2btl highly modded
Polk SDA 1C modded
Polk CS350 LS x2
Kimber 8TC
Sony 55" Bravia
Wish list SVS sub -
afterburnt wrote: »They didn't speak a word of English, they were from South Carolina.
Village Idiot of Club Polk -
RandyCroissant wrote: »Dave is there anything you don't know!!RandyCroissant wrote: »Dave is there anything you don't know!!
Women? -
Once you fully understand them, you're on the wrong side of the lawn.ken brydson wrote: »RandyCroissant wrote: »Dave is there anything you don't know!!RandyCroissant wrote: »Dave is there anything you don't know!!
Women?
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/ -
thats easy its 42.2 ch- Polk CRS+ * Vincent SA-31MK Preamp * Vincent Sp-331 Amp * Marantz SA8005 SACD * Project Xperience Classic TT * Sumiko Blue Point #2 MC cartridge
HT - Polk 703's * NAD T-758 * Adcom 5503 * Oppo 103 * Samsung 60" series 8 LCD -
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Dave is the speaker god, all seeing, all knowing. LOL
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Thanks for having me my first post hear
I had been putting this off for some time now but after reading about others nightmares i decided to take on the task
I just got through with applying the power grab to my MW6502 buy the time i got good at spreading the power grab it was all over with lol
I used this pushed inside to power grab tube to do the magnet base to the speaker basket it's simply one of the brushes you get with a re-foam kit with the bristles removed it worked perfect ! Ijust went ahead and used it for all the mating surfaces.
she may not be the prettiest girl in the room but she will do lol
Next up is to buy the new tweeter upgrades
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Nice work! Welcome to Club Polk.Gustard X26 Pro DAC
Belles 21A Pre modded with Mundorf Supreme caps
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 -
Yes nice job and that will give you some peace of mind. For future reference, you don't need to glue between the basket and the pole piece plate nearest the cone. That must be spotwelded or swaged and not glued.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 -
Thanks' Guys i appreciate your feedback and kind words
Ok Thank you Gardenstater thats great informationGardenstater wrote: »For future reference, you don't need to glue between the basket and the pole piece plate nearest the cone. That must be spot welded or swaged and not glued.
Thought i would throw this little tib bit in for laughs the magnets didn't come lose but the speaker sticker that is usually on the back of the drivers was lying in the bottom of the Monitor 7 cabs i glued them back on also
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That's good. Just like the tags on pillows and so forth, you can go to prison for having one of those labels off.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 -
I use a 30hz signal while re-foaming woofers to absolutely center the voice coil without removing the dust cap.
Would that help in centering the magnet to prevent rub?
If you were off a little, you'd hear it! -
No, it does not help to actually center the magnet. It will let you know that things aren't right, though, so you can take action to correct what's wrong.I use a 30hz signal while re-foaming woofers to absolutely center the voice coil without removing the dust cap.
Would that help in centering the magnet to prevent rub?
If you were off a little, you'd hear it!
Realistically, the MAGNET does not have to be perfectly centered, but the pole piece does.
If you're applying epoxy on a speaker driver that hasn't already come apart, this isn't a concern. The factory alignment hasn't changed. If the pole piece or magnet has already shifted, though, you're going to have to "fix" the alignment and secure the pieces with some other adhesive BEFORE you apply the epoxy.
When it was me, I cleaned the magnet and pole piece, secured the magnet to the basket with a generic equivalent to Loctite 271 high-strength anaerobic thread locker, then aligned the pole piece and secured it to the magnet with the same stuff. THEN the epoxy after the Loctite has cured. And yes, I was playing music through the speaker as I centered the pole piece as an indicator of alignment. There is not a lot of time to get the pole piece aligned before the anaerobic adhesive sets up. Work fast.
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I'd center the magnet and pole piece to the voice coil. No good reason to not do it...
Playing music is the same as using a 30hz signal. So, you do agree with my method! -
No. I would absolutely not play a test tone while re-centering the pole piece. Re-centering the pole piece is much different than re-foaming. While re-centering the pole piece, it will have a tendency to initially snap to one side and lock the voice coil in place as you get it started. I would NOT want the voice coil trying to move as I'm doing this. my 3.1TLs
I will fix your shifted magnets for free. -
That's why I used a fixture. Pole piece does not "snap" anywhere because it's stabilized by the fixture.No. I would absolutely not play a test tone while re-centering the pole piece. Re-centering the pole piece is much different than re-foaming. While re-centering the pole piece, it will have a tendency to initially snap to one side and lock the voice coil in place as you get it started. I would NOT want the voice coil trying to move as I'm doing this.
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That's why I used a fixture. Pole piece does not "snap" anywhere because it's stabilized by the fixture.
That's great - how did you make it? How does it work? my 3.1TLs
I will fix your shifted magnets for free. -
I shamelessly stole the idea from Saftgeek.
https://forum.polkaudio.com/discussion/135716/lets-try-to-fix-a-mw6511-damaged-in-shipping/p1
I can't post photos. Here's links.
http://hbassociates.us/Polk_Magnet_01.jpg
http://hbassociates.us/Polk_Magnet_02.jpg
http://hbassociates.us/Polk_Magnet_03.jpg
http://hbassociates.us/Polk_Magnet_04.jpg
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I shamelessly stole the idea from Saftgeek.
https://forum.polkaudio.com/discussion/135716/lets-try-to-fix-a-mw6511-damaged-in-shipping/p1
I can't post photos. Here's links.
http://hbassociates.us/Polk_Magnet_01.jpg
http://hbassociates.us/Polk_Magnet_02.jpg
http://hbassociates.us/Polk_Magnet_03.jpg
http://hbassociates.us/Polk_Magnet_04.jpg
Gosh that was a good link !! Fun time we had back then. So many folks who no longer stop and say Hi.
