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CRT TV & 15" bass drivers - will it cause me a problem?

Discussion in 'TVs' started by Dbl-trouble, Dec 22, 2001.

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  1. No, you'll be fine

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  2. Hmm, might be a problem

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  3. Oh dear, probably never work

    0 vote(s)
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  4. Order a new TV now, the Sony is dead meat

    0 vote(s)
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  1. Dbl-trouble

    Dbl-trouble
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    My life is about to be invaded by a big pair of speakers with unshielded 15" ATC bass drivers.

    I have never had any problems up until now with magnetic interference from speakers to CRT TVs, but then I've never had speakers with 15" bass drivers, either.

    The TV is a Sony KV-29F1U. See the picture for an idea of the relationship between my current speakers & the TV. The new speakers will be almost twice as wide as those shown.

    Any help will be most appreciated!

    cheers, Martin
     

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  2. Dbl-trouble

    Dbl-trouble
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    If the tube does get affected by the speakers, will it sort itself out when the TV Degausses at next switch-on?

    cheers, Martin
     
  3. Dbl-trouble

    Dbl-trouble
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    Well, no problems so far.
     
  4. Stuart Wright

    Stuart Wright
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    How come you don't have your telly between your speakers?
     
  5. Dbl-trouble

    Dbl-trouble
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    I occasionally wire the TV to the system for films, but it's mainly a music system. Two channel only.

    I am more concerned with upsetting the performance of music by placing an object between the speakers.

    This location also suits all the obvious locations for seating in the room.

    Still, must try out a good film to test the 17Hz -3dB point! Any suggestions?

    cheers, Martin
     
  6. BadAss

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    If I was you Id push the speakers out a couple of feet on either side to give you a wider sound stage and put the TV in the middle. But make sure theres a foot or two between TV and speaker just in case. In my opinion the left and right speakers should be set at 45 degrees from the listening position. And placing the TV between the speaker wont make any difference to the sound what so ever.
     
  7. Dbl-trouble

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    I'm afraid we'll have to agree to disagree about that one.

    Maybe it's not such a problem when the other channels fill out the sound.

    cheers, Martin
     
  8. BadAss

    BadAss
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    How? The sound from you speakers should radiate towards you and as there is nothing between you and you speakers then the sound should remain the same.
     
  9. Dbl-trouble

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    I'm sorry, but this is a fundamental misunderstanding of the propagation of sound away from a speaker.

    I believe your main L+R speakers are 23cm wide. Sound is only "beamed" towards you where the wavelength of the sound is significantly smaller than the width of the box. This is approximately 1.5KHz in your case.

    Below this, the sound diffracts outwards to the sides, and even around the back of the box.

    These diffracted sounds are critical to achieving a 'room filling' sound. I believe that improved dispersion is touted as an advantage of the coincident Uni-Q drivers of your Kefs.

    Those diffracted sounds below 1.5KHz will create early reflections off any solid obstruction near to (and especially between) the speakers, and will create a confusion to the sound.

    For a much fuller description of this effect, refer to 'High Performance Loudspeakers' by Martin Colloms. The chapter 'Theoretical aspects of diaphragm radiators' explains this effect. The later chapter 'Low frequency system analysis: room environments and 2pi theory' then extends this to explain why placing a speaker closer to the back and/or side walls and/or floor will give a more bassy sound (often at the expense of tightness and speed).

    cheers, Martin
     
  10. BadAss

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    Dont tell me, you dont have your TV between your speakers either.:p
     

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