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Thread: Magnetic shielding for Sierra-1

  1. #1
    Join Date
    Jan 2014
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    3

    Default Magnetic shielding for Sierra-1

    I am settling on some Sierra-1's and the ordering gives you the option of adding magnetic shielding for an additional $40. Although I don't have any CRT display etc, are there
    any other situations where having the shielding would be needed? For example it seems
    like it is worth adding this on, for any future issues (e.g., setting a wallet with
    magnetic strip credit cards on top, etc). And it would be better to do it now rather
    than be sorry later.

    Also, I assume the shielding is a metal cover of some
    sort or another than covers the (mainly) woofer magnet. Does any one know if this
    affects the audio quality in any way? Thank you. Joe

  2. #2
    Join Date
    Aug 2003
    Location
    Manhattan Beach, California
    Posts
    7,032

    Default Re: Magnetic shielding for Sierra-1

    It doesn't affect sound quality.

    That said, I have never heard/read of anybody having any issue with non-shielded speakers and credit cards.
    -curtis

  3. #3
    Join Date
    Jan 2014
    Posts
    3

    Default Re: Magnetic shielding for Sierra-1

    Thanks Curtis, I appreciate your reply. Until it showed up as an option on the
    online ordering page, I hadn't given the topic too much thought, since CRT's are
    rarely found in home systems anymore. --Joe

  4. #4
    Join Date
    Mar 2004
    Location
    SouthWest of Cleveland
    Posts
    1,924

    Default Re: Magnetic shielding for Sierra-1

    There was a discussion on this a few weeks ago but I don't recall what thread it was in.

    The magnetic flux, or gauss, generated by the woofer's magnet is very minimal even right up against the cabinet. The CRT sets were extremely sensitive to any external magnetic fields and close proximity to a speaker could cause distortion on the screen and could become permanent with prolonged exposure.

    I would not worry about it.
    Ed

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