Sean please don't hate me..my SDA's

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  • gshisme
    gshisme Posts: 1,038
    edited March 2004
    Originally posted by madmax
    He could always buy magnets and glue them on the back of the existing ones in the opposite polarity.

    madmax and Jstas, interesting argument going on here. Me being the dumb-**** that I am will just sit this one out and wait for the results. madmax, are you sure about the reverse polarity thing?
    suds, suds and more suds!
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited March 2004
    Absolutely... they're called bucking magnets...

    From the Polk parts lists
    http://clubpolk.polkaudio.com/service/parts/partslist.php3?item=misc

    Shielding magnet (tw) ea RD0260-2 $6.00 $4.80
    Shielding magnet (dr) ea RD0108-1 $7.00 $5.60
    More later,
    Tour...
    Vox Copuli
    Better to remain silent and be thought a fool, than to open your mouth and remove all doubt. - Old English Proverb

    "Death doesn't come with a Uhaul." - Dennis Gardner
    "It's easy to get lost in price vs performance vs ego vs illusion." - doro
    "There is a certain entertainment value in ripping the occaisonal (sic) buttmunch..." - TroyD
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  • Jstas
    Jstas Posts: 14,842
    edited March 2004
    Who's arguing? I'm not arguing! Just tryin' to help! I thought madmax had a good idea! I wish I had thought of it! ;)
    Expert Moron Extraordinaire

    You're just jealous 'cause the voices don't talk to you!
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited March 2004
    Ditto...

    Greg,

    Just allerting you to a potential issue and you're trying to stir up trouble... :D

    Seriously, just trading thoughts on the nature of the issue.

    And the impact on your CRT, whatever the cause, is two-fold: acute and chronic. The slight move you made got you out of the field for acute impact, but in time that lower right corner may still turn blue-ish. Modern TV's do a modest degaussing at power up. May be enough to hold the problem at bay.

    BTW, bucking magnets reduce speaker sensitivity by about 0.5 dB.

    max,
    Old old Stereo Review discussed making magnetic shields and grounding was integral to the design.
    More later,
    Tour...
    Vox Copuli
    Better to remain silent and be thought a fool, than to open your mouth and remove all doubt. - Old English Proverb

    "Death doesn't come with a Uhaul." - Dennis Gardner
    "It's easy to get lost in price vs performance vs ego vs illusion." - doro
    "There is a certain entertainment value in ripping the occaisonal (sic) buttmunch..." - TroyD
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  • F1nut
    F1nut Posts: 50,746
    edited March 2004
    I'm adding my .02, I agree with Madmax and Tour. Forget steel plates and all that crap, get the bucking magnets for the mids and the tweeters. You want to install them in reverse polarity and use 5 minute epoxy for glue. All problems solved.
    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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  • madmax
    madmax Posts: 12,434
    edited March 2004
    Originally posted by Tour2ma

    max,
    Old old Stereo Review discussed making magnetic shields and grounding was integral to the design.

    I don't know why but I just like arguing with you Tour. I'm sure the grounding is just to drain the RF to ground. It will make no difference how much of the perm mag magnetic field will flow through the metal.

    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • madmax
    madmax Posts: 12,434
    edited March 2004
    Originally posted by gshisme
    Had a buddy of mine over tonight who plays in a band to put a listen on the SDA's. He was unimpressed. Guess his Realistics sound better....Jeez

    My SDA's feel so unappreciated right now.

    It takes real work to know how to listen and what to listen for. Although most "band" people like the SDA's because of their "real" sound it is understandable why your friend may not care for them. Many musicians have a problem with listening because they are listening for their particular instrument. If he is a guitar player he is listening mainly to the guitar and the rest of the sound is being ignored. Have you ever noticed how you can listen to a song for years and all of a sudden you hear something new? It is because for whatever reason you started paying attention to it. Musicians are far worse than you. I would go so far as to say that some musicians subconciously consider all the other sounds a simple backdrop and unimportant and therefore ignore most of the sound. (They have to be that way to play their unique lines in the middle of all the other commotion going on in the song).
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • gshisme
    gshisme Posts: 1,038
    edited March 2004
    Woops, my way with words eluded me last night after 8 too many. Damn there seems to be a remedy for just about anything audio\video related on this forum. Super!
    suds, suds and more suds!
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  • Jstas
    Jstas Posts: 14,842
    edited March 2004
    You have to ground the sheilding plates because, if you don't, over time, the sheilding plates themselves can become magnetized. Grounding the sheild plates prevents that because it has a place for any electrical charge that is built up due to magnetization to dissapate or at least balance out. I forgot to mention the grounding. The sheilding would still work ungrounded but it will work much better when grounded.

    The bucking magnets is a much better idea both functionally and asthetically.
    Expert Moron Extraordinaire

    You're just jealous 'cause the voices don't talk to you!
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited March 2004
    Ed Zachery, J...

    And max, that was an interesting observation on musicians and their listening patterns... Of course it was dead wrong.. :D
    More later,
    Tour...
    Vox Copuli
    Better to remain silent and be thought a fool, than to open your mouth and remove all doubt. - Old English Proverb

    "Death doesn't come with a Uhaul." - Dennis Gardner
    "It's easy to get lost in price vs performance vs ego vs illusion." - doro
    "There is a certain entertainment value in ripping the occaisonal (sic) buttmunch..." - TroyD
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  • madmax
    madmax Posts: 12,434
    edited March 2004
    :D
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • gshisme
    gshisme Posts: 1,038
    edited March 2004
    Originally posted by Tour2ma
    Ed Zachery, J...

    And max, that was an interesting observation on musicians and their listening patterns... Of course it was dead wrong.. :D

    I think we have an argument here
    suds, suds and more suds!
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  • madmax
    madmax Posts: 12,434
    edited March 2004
    Originally posted by gshisme
    I think we have an argument here

    I would never argue over an opinion. (unless it was Tours opinion).

    I'm still considering an argument over the magnetism draining to ground though. Is the magnetism with respect to ground? If it is then it could be debated that you could drain it off as said but if it is not, it could not be. I'm still thinking there may be a different reasoning behind the ground.
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • gshisme
    gshisme Posts: 1,038
    edited March 2004
    I failed to mention..after Sean's recommendation of moving the speakers forward a little, I did just that in addition to moving them sideways away from the TV. No more "gaussing". Wondering which had more impact. Right now don't really care to move em around any more to find out. Those suckas are heavy. One other thing bothering me. For crossover maint. Polk recommends shipping the SDA2's to their facility while other SDA's can be replaced in house. ??? Questions..man I got a million of em.
    suds, suds and more suds!
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  • Jstas
    Jstas Posts: 14,842
    edited March 2004
    Fine, don't believe me. It's physics. The shield gains an electrical charge when it is magnetized. The ground dissapates that electrical charge. It doesn't allow a charge to build up so the shield never gets magnetized and therefore always works as a shield.
    Expert Moron Extraordinaire

    You're just jealous 'cause the voices don't talk to you!
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  • LVB
    LVB Posts: 7
    edited March 2004
    Hi, I have been lurking for a while here but I can't any more. I have a pair of sda 2's that I just love. I got these in Nov. 2003 and I can not seem to listen to any other speakers for more than an 30 min. Its been a long time since I have been so happy with a speaker, and I can't stop the SDA grin.
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  • madmax
    madmax Posts: 12,434
    edited March 2004
    Originally posted by Jstas
    Fine, don't believe me. It's physics. The shield gains an electrical charge when it is magnetized. The ground dissapates that electrical charge. It doesn't allow a charge to build up so the shield never gets magnetized and therefore always works as a shield.

    Don't get excited. I am just saying I don't understand it. That is why I said I was "CONSIDERING" and argument. If I took all the BS I read on forums as truth without question I would probably be busy Armour-All'ing my drivers right now :D


    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • Tour2ma
    Tour2ma Posts: 10,177
    edited March 2004
    LOL... So true max...
    Originally posted by LVB
    Hi, I have been lurking for a while here...
    Don't think we didn't see you... been watching you for awhile... :D

    Welcome to the Club. Which series do you have?
    More later,
    Tour...
    Vox Copuli
    Better to remain silent and be thought a fool, than to open your mouth and remove all doubt. - Old English Proverb

    "Death doesn't come with a Uhaul." - Dennis Gardner
    "It's easy to get lost in price vs performance vs ego vs illusion." - doro
    "There is a certain entertainment value in ripping the occaisonal (sic) buttmunch..." - TroyD
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  • LVB
    LVB Posts: 7
    edited March 2004
    Welcome to the Club. Which series do you have?
    I have the original SDA-2's with three mid-woofers and two tweeters and blade-blade interconnect.
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  • gshisme
    gshisme Posts: 1,038
    edited March 2004
    Originally posted by LVB
    I have the original SDA-2's with three mid-woofers and two tweeters and blade-blade interconnect.

    LVB, club rule...must post pics!;) and welcome. Just kidding about the club rule but sure would be nice to see 'em.
    suds, suds and more suds!
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