Vintage speakers = NON magnetically shielded...

TECHNOKID
TECHNOKID Posts: 4,298
edited May 2010 in Vintage Speakers
Good evening all;
I am relocating my living room electronics. I moved away the large entertainment unit that I used for many years as it really looked pass
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“Your attitude, almost always determine your altitude in life” ;)
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  • ben62670
    ben62670 Posts: 15,969
    edited March 2010
    Get some shielding magnets from parts-express if you have any problems with the tubed TV.
    They are easily glued in place with some epoxy.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • TECHNOKID
    TECHNOKID Posts: 4,298
    edited March 2010
    ben62670 wrote: »
    Get some shielding magnets from parts-express if you have any problems with the tubed TV.
    They are easily glued in place with some epoxy.
    Thanks Ben however, I've search for the above on their site and it doesn't seem to be available any longer. I'll try to google this...

    Cheers!
    TK
    DARE TO SOAR:
    “Your attitude, almost always determine your altitude in life” ;)
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  • ben62670
    ben62670 Posts: 15,969
    edited March 2010
    Try Madisound.
    http://www.madisound.com/catalog/advanced_search_result.php?keywords=bucking+magnets&Submit=Search+store&categories_id=&search_in_description=1&inc_subcat=1
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • HB27
    HB27 Posts: 1,518
    edited March 2010
    Sometimes called "horseshoe" or "Bucking" magnets.
    Try simulating your set up as close as possible and determine IF magnetic interferrence will actually be an issue.
    A matter of an inch may be enough clearance.
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  • concealer404
    concealer404 Posts: 7,440
    edited March 2010
    Get some VS-25s. ;)
    I don't read the newsssspaperssss because dey aaaallllllllll...... have ugly print.

    Living Room: B&K Reference 5 S2 / Parasound HCA-1000A / Emotiva XDA-2 / Pioneer BDP-51FD / Paradigm 11se MKiii

    Desk: Schiit Magni 2 Uber / Schiit Modi 2 Uber / ISK HD9999

    Office: Schiit Magni 2 Uber / Schiit Modi 2 Uber / Dynaco SCA-80Q / Paradigm Legend V.3

    HT: Denon AVR-X3400H / Sony UBP-X700 / RT16 / CS350LS / RT7 / SVS PB1000
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  • heiney9
    heiney9 Posts: 25,217
    edited March 2010
    Get a plasma or led tv
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • thsmith
    thsmith Posts: 6,082
    edited March 2010
    Exactly how close are the speakers going to be to the tube ?

    I really doubt you will have a problem. My 1Cs sit very close to my CRTRP and I have no issues.
    Speakers: SDA-1C (most all the goodies)
    Preamp: Joule Electra LA-150 MKII SE
    Amp: Wright WPA 50-50 EAT KT88s
    Analog: Marantz TT-15S1 MBS Glider SL| Wright WPP100C Amperex BB 6er5 and 7316 & WPM-100 SUT
    Digital: Mac mini 2.3GHz dual-core i5 8g RAM 1.5 TB HDD Music Server Amarra (memory play) - USB - W4S DAC 2
    Cables: Mits S3 IC and Spk cables| PS Audio PCs
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  • TECHNOKID
    TECHNOKID Posts: 4,298
    edited March 2010
    heiney9 wrote: »
    Get a plasma or led tv
    Humm, I sure tought about this, very tempting but;

    1. I use a PJ in the basement HT for movies and...
    2. Both Living room and bedroom TV's are Sony ( Trinitron & Wega) which are in great shape (perfect condition) and it would be a shame to let them go.
    3. The living room is my chosen area to keep alive my vintage gear and Plasma and-or LCD might not cut it with this decor.
    thsmith wrote: »
    Exactly how close are the speakers going to be to the tube ?

    I really doubt you will have a problem. My 1Cs sit very close to my CRTRP and I have no issues.
    I did some checking-testing, I positioned the speaker on the tower furniture as far as possible from the TV side which is aprroximately 6 inches and I can see color and picture distortion both the bottom and top of the CRT. I then proceeded to move the speakers farther away from the TV until the distortion disappeared on the tube and this started to occur at approximately 15 inches. This kind of make sense, ideally I would say between 2 - 3 feet away from a CRT would be safe in the case of NON magnetically shielded speakers.

    I've done some search after Ben's response and another option to shield the magnet(s) was mentioned on many sites. Here is an option, has anyone tried this? Any opinions?

    http://www.lessemf.com/mag-shld.html
    http://andrewrondeau.com/Voight%20Pipes/shielding.html
    http://www.trifield.com/EMF_shielding.htm
    http://stason.org/TULARC/entertainment/audio/general/12-15-Can-I-magnetically-shield-my-speakers-for-use-near-a-T.html

    Cheers!
    TK
    DARE TO SOAR:
    “Your attitude, almost always determine your altitude in life” ;)
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  • heiney9
    heiney9 Posts: 25,217
    edited March 2010
    I hear ya TK, I still have a perfectly nice Mits crt TV, but I took the plunge on a plasma and I didn't know what I was missing-lol

    Polk used to sell "bucking" magnets you can put on the driver magnets. Not sure if they still do. The magnets do alter the drivers a bit. You could call Polk CS and see if they are still avail.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • TECHNOKID
    TECHNOKID Posts: 4,298
    edited March 2010
    heiney9 wrote: »
    I hear ya TK, I still have a perfectly nice Mits crt TV, but I took the plunge on a plasma and I didn't know what I was missing-lol

    Polk used to sell "bucking" magnets you can put on the driver magnets. Not sure if they still do. The magnets do alter the drivers a bit. You could call Polk CS and see if they are still avail.
    Thanks, I'll check if Polk still carries them. You are right about altering the driver, I also read about that after searching for more info on the subject. As far as LCD and-or Plasma, if I were to replace one of the Sony, I would ratter start with the bedroom for space saving. By the way, you would be surprised how good a digital signal interfaced to a CRT looks. Agreed it is not 1080p but still quite an improvement over the usual 480i signal.

    Cheers!
    TK
    DARE TO SOAR:
    “Your attitude, almost always determine your altitude in life” ;)
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  • kcoc321
    kcoc321 Posts: 1,788
    edited March 2010
    TK, I don't what vintage speaker you are trying to use, but the MW6504's are a shielded version of the MW6502. Ben (concealer404) is somewhat right, as the VS-25's have them.
    Polk CS might still have them, if they don't have any bucking magnets available.
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  • TECHNOKID
    TECHNOKID Posts: 4,298
    edited March 2010
    kcoc321 wrote: »
    TK, I don't what vintage speaker you are trying to use, but the MW6504's are a shielded version of the MW6502. Ben (concealer404) is somewhat right, as the VS-25's have them.
    Polk CS might still have them, if they don't have any bucking magnets available.
    I have other speakers (modern, smaller and shielded) which I could use but while those vintage are not high end they are full of memories along with being in mint condition. I always loved the warm sound coming out of them. This small living room (10' x 12' Wide).
    Sorry, I guess I was not clear enough when describing my vintage speakers. We are NOT talking about any of my POLK speakers (which are ALL magnetically shielded) but I am ratter talking about my AKAI SW-177 vintage speakers (http://www.vintage-audio.com.ua/en/cat/232/857.html; http://www.polkaudio.com/forums/showthread.php?t=89352&highlight=akai)

    Cheers!
    TK
    DARE TO SOAR:
    “Your attitude, almost always determine your altitude in life” ;)
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  • kcoc321
    kcoc321 Posts: 1,788
    edited March 2010
    TECHNOKID wrote: »
    Sorry, I guess I was not clear enough when describing my vintage speakers. We are NOT talking about any of my POLK speakers (which are ALL magnetically shielded) but I am ratter talking about my AKAI SW-177 vintage speakers (http://www.vintage-audio.com.ua/en/cat/232/857.html; http://www.polkaudio.com/forums/showthread.php?t=89352&highlight=akai)

    Cheers!
    TK

    AH, alrighty...then you do need the aftermarket bucking magnets
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  • F1nut
    F1nut Posts: 50,756
    edited March 2010
    I'm pretty sure our friends north of the border spell it as we do, rather ;)
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • raybertrand
    raybertrand Posts: 3
    edited March 2010
    TECHNOKID wrote: »
    Good evening all;
    I am relocating my living room electronics. I moved away the large entertainment unit that I used for many years as it really looked pass
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  • F1nut
    F1nut Posts: 50,756
    edited March 2010
    Ummmm, no. Besides messing up cabinet resonance, you're not even canceling the magnetic field created by the driver's magnet doing what you describe.

    Bucking magnets are cheap and very effective.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • comfortablycurt
    comfortablycurt Posts: 6,745
    edited March 2010
    raybertrand wrote: »
    Go to your nearest Sign making outlet or print shop (business cards )......or even a cheap dollar store or china importer, and buy the mag strisp commonly used on refrig reminders.
    Use the strips (2) glued together black side facing ea. other. staple them inside the cabinet nearest the speaker mags.
    do only the side that will be adjacnt to the TV mon.
    for added resist....place a cheap steel (1/64th thickness) plate onto the inner wall surface where the mags allign and mount it so that there is 3 in. below and above the mag. diam....the plates are scrap ...you can even buy plates at home depot....you can even use studd connector pieces holes and all.
    This requires removing usually the large speaker for access to inner surface of spkr. you should be able to approach close to 4 inches before you begin to see distortion.


    .

    What you're describing wouldn't really solve the problem the right way. That also sounds like much more work than is necessary. As Jesse mentioned above, this would also be changing the cabinet resonances, along with not even cancelling the magnetic field.

    Bucking magnets work very well, are very cheap, and take all of 20 seconds to install. I picked up some bucking magnets a while back for a pair of circa-1992 Polk Mini Monitors. I was using one of them as a center channel for a while, and it wasn't magnetically shielded. I put the bucking magnet on, and it solved my problem instantly.

    Others have mentioned that the bucking magnets can affect the sound...but I can't say that I ever noticed any audible differences.
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  • 20hz
    20hz Posts: 636
    edited May 2010
    Great news !
    I wanted to sheild a pair of older S4 , polk still carries the magnet for the mw7000 6.5" driver but not for the tweeter but I found one at madisound ( I know its mentioned above)
    but I got the magnet for 50 cents !!!
    I just tried it and it works great !!
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  • TECHNOKID
    TECHNOKID Posts: 4,298
    edited May 2010
    20hz wrote: »
    Great news !
    I wanted to sheild a pair of older S4 , polk still carries the magnet for the mw7000 6.5" driver but not for the tweeter but I found one at madisound ( I know its mentioned above)
    but I got the magnet for 50 cents !!!
    I just tried it and it works great !!
    Odd, I communicated with Polk and was told they dodn't carry them anymore. Yes madisound carries them but were back order when I first checked. Nice to heaR THAT THEY ARE BACK.

    Cheers!
    TK
    DARE TO SOAR:
    “Your attitude, almost always determine your altitude in life” ;)
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  • 20hz
    20hz Posts: 636
    edited May 2010
    Yes polk no longer has the magnet for the tweeter sl5000 but madisound.com has item # 707517 they are 50 cents each (plus you get a feee catalogue) .
    So I bought polks magnet for the mw7000 and madisounds #707517 for the tweeter .
    This gives me everything for the S4 .
    I got All four magnets this month .
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  • ben62670
    ben62670 Posts: 15,969
    edited May 2010
    Congrats!
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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