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  1. #1
    AR Newbie Registered Member
    Join Date
    Feb 2009

    Picture Distortion


    How can I detect picture distortion when placing non-magnetically shielded speakers
    (BW DM-303) close to TV ?

    Technically what is the minimum distance I should place speakers from TV in order not to get distorted ?

    Thanks in advance

  2. #2
    Music Junkie E-Stat's Avatar
    Join Date
    Dec 2003
    Quote Originally Posted by nicolemcgrgr50
    How can I detect picture distortion when placing non-magnetically shielded speakers (BW DM-303) close to TV ?
    In my case, the color on the TV went greenish at the lateral extremes. You won't harm anything by placing them very close, noting the visual difference, then moving them far enough away to eliminate the interference.


  3. #3

  4. #4
    Forum Regular blackraven's Avatar
    Join Date
    Nov 2006
    St. Paul, Minnesota
    If you have an LCD you wont have that problem.
    Pass Labs X250 amp, BAT Vk-51se Preamp,
    Thorens TD-145 TT, Bellari phono preamp, Nagaoka MP-200 Cartridge
    Magnepan QR1.6 speakers
    Luxman DA-06 DAC
    Van Alstine Ultra Plus Hybrid Tube DAC
    Dual Martin Logan Original Dynamo Subs
    Parasound A21 amp
    Vintage Luxman T-110 tuner
    Magnepan MMG's, Grant Fidelity DAC-11, Class D CDA254 amp
    Monitor Audio S1 speakers, PSB B6 speakers
    Vintage Technic's Integrated amp
    Music Hall 25.2 CDP
    Adcom GFR 700 AVR
    Cables- Cardas, Silnote, BJC
    Velodyne CHT 8 sub

  5. #5
    Charm Thai™
    Join Date
    Feb 2002
    Cleveland, Ohio
    Same thing happens to my TV. The picture turns green where it's closest to the's most noticeable on white backgrounds. Find a channel with a lot of white in the picture and if it looks green you'll know you've got interference.

  6. #6
    Forum Regular Kevio's Avatar
    Join Date
    Dec 2008
    There are two kinds of distortion - color and geometric. If your picture is warping, the speaker is too close.

    If you got a blotch of distorted color you may or may not need to move it further away. Leave the speaker in the same place and turn the TV on and off a few times. This will demagnetize the color mask and will probably clear up color distortion at least until the next time you move the speaker(s).

    With this procedure, I was successfully using a DM-302 as a center channel speaker directly below the tube for a while. No damage was done.

  7. #7
    Audio/HT Nut version 1.3a
    Join Date
    Jan 2008
    Quote Originally Posted by blackraven
    If you have an LCD you wont have that problem.
    Same goes for plasma. Only CRT TV's have problems with non-shielded speakers.


  8. #8
    Forum Regular hermanv's Avatar
    Join Date
    Dec 2004
    Santa Rosa, CA
    Only a problem with CRT sets.

    Some sets will require a technician for degaussing once magnets have been too close. It is better to sneak up on the spacing carefully watch for any color change as the speakers get closer.

    Normally 3 feet would be enough for all but the very strongest driver magnets

    My stuff:
    Olive Musica/transport and server
    Mark Levinson No.360S D to A
    Passive pre (homemade; Shallco, Vishay, Cardas wire/connectors)
    Cardas Golden Presence IC
    Pass Labs X250
    Martin Logan ReQuests.

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