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  1. #1

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    Default Are SDA 1C and LSIM 707 magnetically shielded?

    I am going to place it a few inches to a PC, but can't find the info on polk website.

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    The SDA 1C's are not, but you can add bucking magnets.

    I'm not sure about the 707's
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    Shouldn't matter - your pc wouldn't be affected by it anyways. Hard drive is pretty much a Faraday cage, and the computer chassis should be UL rated to keep EMI in, as well as out.
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    ^
    I don't think my $15 case is UL rated :)

    anyone know about the 707? I am surprised polk website doesn't mention it at all.

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    Hello,
    No, they are not magnetically shielded.
    Cheers, Ken

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    PC expert here, still wouldn't put a PC anywhere near a big bad speaker, the magnets can affect more than just the hard drive, they can also affect the processor cycles, video controller cycles etc. seen it happen too many times to count by clients.
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    Quote Originally Posted by nbrowser View Post
    PC expert here, still wouldn't put a PC anywhere near a big bad speaker, the magnets can affect more than just the hard drive, they can also affect the processor cycles, video controller cycles etc. seen it happen too many times to count by clients.
    Just curious what is the safe distance?

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    I don't believe you have anything to worry about. I regularily set my headphones directly on my laptop, no issues. I regularily set my laptop directly in front of my Monitor 5's and inbetween my RTA-12's, no issues.

    It's possible but it would take an extremely powerful, and probably energized, magnet to achieve what you are worried about. For reference there are neodymium magnets directly inside of a HDD.

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    Have you seen the magnets on the 707's? Polk was serious about these drivers...very strong looking motors on all drivers including the mid and tweet. http://www.hometheater.com/images/Po...jpg?1315751397

    Very strong magnets CAN damage a PC, but not sure how strong the field would be coming from the 707's? You might be OK?
    http://www.youtube.com/watch?v=U8LWTe5CqQg


    However, if it was me and I had my 1TB drive with all my music and movies etc and I had to put it close to the 707's, I would use magnetic shielding foil to protect the drive as best possible. Maybe sheets inside the case as well as barrier on the outside.
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    so, the conclusion is?


    Ken,
    is that info documented anywhere? I can't find it in the manual even. I am surprised that Polk didn't think of that considering today it's normal to see a HTPC or laptop in the home entertainment center.

    Worse is the 1Cs, especially during the same period, where most TVs are CRT.

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    Hi nhhiep,
    I asked Kim at Polk CS to be sure and he confirmed that they weren't. Also, you can see in the cut-away drawings that there isn't a bucking magnet on the woofers or drivers. I would imagine that with the proliferation of non-CRT type television sets the need for magnetic shielding became less.
    Regards, Ken

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    The conclusion is, draw your own conclusion. ;)

    Watch the video WLDock posted though - http://www.youtube.com/watch?v=U8LWTe5CqQg

    I mean. It took a GIANT, engergized magnet held to the laptop for 20+ seconds to do damage. Even the smaller energized magnet held directly over the HDD did nothing and that is directly touching the laptop case, not a a few inches of air as well as a speaker cabinet in between.
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