Do towers close to a plasma TV need to be shielded?

SomeDude
SomeDude Posts: 3
edited February 2012 in Speakers
I was set on the TSi400, but then realized they're probably not shielded and I'll be putting them up against my plasma TV (due to space constraints). Polk makes it a point to offer shielded center speakers. I'm now thinking of going with the Yamaha NS-555 since they are shielded (and as a bonus, go down to 30Hz and have two 6.5" and one 5" driver, instead of 44Hz with three 5.25" (more size diversity seems good)).

Thoughts? :cheesygrin:
Post edited by SomeDude on
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  • tonyb
    tonyb Posts: 33,011
    edited February 2012
    I believe all of Polks speakers are shielded, something that has become an industry standard years ago from major brands. Exceptions exist of coarse, but Polk speakers should have no problem.
    HT SYSTEM-
    Sony 850c 4k
    Pioneer elite vhx 21
    Sony 4k BRP
    SVS SB-2000
    Polk Sig. 20's
    Polk FX500 surrounds

    Cables-
    Acoustic zen Satori speaker cables
    Acoustic zen Matrix 2 IC's
    Wireworld eclipse 7 ic's
    Audio metallurgy ga-o digital cable

    Kitchen

    Sonos zp90
    Grant Fidelity tube dac
    B&k 1420
    lsi 9's
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  • mdaudioguy
    mdaudioguy Posts: 5,165
    edited February 2012
    Plasma TVs are not affected by a non-shielded speaker.
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  • mdaudioguy
    mdaudioguy Posts: 5,165
    edited February 2012
    tonyb wrote: »
    I believe all of Polks speakers are shielded, something that has become an industry standard years ago from major brands. Exceptions exist of coarse, but Polk speakers should have no problem.
    Interestingly, the TSi manual only specifically mentions that the center speakers are shielded. However, this was only an issue with CRT TVs.

    And, if it was a real problem, we'd probably have seen many posts about it on here by now...
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  • SomeDude
    SomeDude Posts: 3
    edited February 2012
    Wow fast replies.

    Check out the last 2 pages of: http://www.polkaudio.com/downloads/catalogs/2008/TSi_Series.pdf It has a "Magnetic Shielding" row for center speakers, powered subs, and surrounds, and they're listed "yes, no, no" respectively. The row isn't there for the floorstanding or bookshelf :sad:
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  • Conradicles
    Conradicles Posts: 6,134
    edited February 2012
    mdaudioguy wrote: »
    Plasma TVs are not affected by a non-shielded speaker.

    Bingo.
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  • SomeDude
    SomeDude Posts: 3
    edited February 2012
    The LSi, VM, and RTi series brochures all make it a point to say that the towers are shielded. So it appears that the TSi isn't shielded.

    I'm glad to hear you say plasmas aren't affected. However, EMR, depending how strong it is, can affect all electronics, causing current to flow from changing magnetic waves. 100W through 8ohms means 3.5A, comparable to a vacuum cleaner, and that's probably sizable EMR. As to whether it would affect a plasma or any other electronics next to it isn't obvious to me.
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  • jbooker82
    jbooker82 Posts: 1,627
    edited February 2012
    I know for a fact my RTI A7's are sheled. I took all the drivers out dynomat the sheilds / driver baskets.
    AVR: Onkyo Tx-NR808
    Amplifier: Carver A-753x 250 watts x 3
    Fronts: Polk RTI A7 (modded by Trey VR3)
    Center: CSI A4 (modded by Trey VR3)
    Rear: FXI A4
    Sub: Polk DSW Pro 660wi
    TV: LG Infinia 50PX950 3D
    Speaker Cable: AudioQuest Type 8
    IC: AudioQuest Black Mamba II
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  • pyrocyborg
    pyrocyborg Posts: 524
    edited February 2012
    No problem with LCD/Plasma TV, as long as they're not close (few inches). Sure, it won't do any visible damage in the short run if they're close, but it might not help their long term durability. But if and how it will affect them is unknown to me. I mean, your high current wires may already be doing some kind of EMI to nearby electronics...
    Speakers: Polk Audio LSiM 705, LSiM 703, LSiM 704c
    Receiver: Denon X3500H
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  • cnh
    cnh Posts: 13,284
    edited February 2012
    The boys pretty much have this. Shielding is only necessary if you have electron guns firing to phosphors on the TV screen which you do not have in a plasma (that's not how the picture is formed). The magnetic fields affect the direction of the beams distorting the field, exciting phosphors, causing localized discoloration, and so forth.

    You're good!

    cnh
    Currently orbiting Bowie's Blackstar.!

    Polk Lsi-7s, Def Tech 8" sub, HK 3490, HK HD 990 (CDP/DAC), AKG Q701s
    [sig. changed on a monthly basis as I rotate in and out of my stash]
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  • Soverign
    Soverign Posts: 11
    edited February 2012
    :mrgreen:Hi all, I have my RTA-15tl's about 10 inches from side of crt t.v., and perhaps 3-4 inches in front, so far, no problem, and they are not shielded.....As for this affecting long-term t.v. problems, I don't know, but don't care much either, as the t.v. is old, and it don't matter to me......Just my two cents
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