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Thread: Interesting Chinese field coil 13" driver.

  1. #1
    Join Date: Apr 2012

    Location: Southall, West London

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    I'm Geoff.

    Default Interesting Chinese field coil 13" driver.

    Rather decent looking field coil bass drive unit from Queenway of China. Not exactly cheap though!

    https://nl.aliexpress.com/item/Lijn-...OrigTitle=true

  2. #2
    Join Date: Oct 2012

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    I'm Alan.

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    戈登贝内特

  3. #3
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    I'm Timothy.

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    ^^^Yeah, exactly what he said! Uh...what was it that you said there?
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  4. #4
    Join Date: Aug 2008

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    Quote Originally Posted by Firebottle View Post
    戈登贝内特
    Years ago in a previous job we had a customer called Gorden Bennett. It gets better.. Gorden. F. Bennett! Another guy was called B.J. Wells!

    Anyway, yes cor, blimey, that’s a biggun.
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  5. #5
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    Quote Originally Posted by Firebottle View Post
    戈登贝内特
    meaning Gordon Bennett
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  6. #6
    Join Date: Apr 2016

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    Quote Originally Posted by walpurgis View Post
    Rather decent looking field coil bass drive unit from Queenway of China. Not exactly cheap though!

    https://nl.aliexpress.com/item/Lijn-...OrigTitle=true
    Kinda lost interest when I saw the price.
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  7. #7
    Join Date: Apr 2012

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    Quote Originally Posted by paulf-2007 View Post
    Kinda lost interest when I saw the price.
    The other products from this maker are well worth a look.

  8. #8
    Join Date: Feb 2008

    Location: Middlesex, UK

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    I'm Alex.

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    There is a 12" Magnavox field coil speaker in a very very old radio here.

    Is there any advantage of field coil units?
    Spendorman

  9. #9
    Join Date: Jan 2009

    Location: Essex

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    I'm openingabottleofwine.

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    Quote Originally Posted by walpurgis View Post
    Rather decent looking field coil bass drive unit from Queenway of China. Not exactly cheap though!

    https://nl.aliexpress.com/item/Lijn-...OrigTitle=true
    Probably need a couple of these to drive them properly:

    https://nl.aliexpress.com/item/Line-....13339.90158.0
    Have you listened to this month's choice in the Album Club?

    Barry

  10. #10
    Join Date: Jan 2009

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    Quote Originally Posted by spendorman View Post
    There is a 12" Magnavox field coil speaker in a very very old radio here.

    Is there any advantage of field coil units?
    That one has bothered me for some time. I assume it is historic, as permanent magnets then were not powerful enough (i.e. could not produce sufficient flux density).

    However the power supply has to be very well smoothed, otherwise any residual mains hum would modulate the audio signal. Traditionally they ran off 100V and consumed a fair bit of power.

    The only advantage of field coils I can see is that you can vary the energising current, and hence the damping.
    Have you listened to this month's choice in the Album Club?

    Barry

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