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Thread: Tannoy IIILZ

  1. #11
    Join Date: Feb 2013

    Location: W Lothian

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    I'm Grant.

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    He has various colours but this is the most popular...beige

    http://www.ebay.co.uk/itm/1521324391...%3AMEBIDX%3AIT
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    Grant .... ؠ ......Don't be such a big girl's blouse

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  2. #12
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,625
    I'm Geoff.

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    The acrylic adhesive is way stronger than PVA. It's not particularly cheap, but it is excellent stuff. A repair is likely to be stronger than the surrounding cloth.

    I've used it for all sorts of things. It bonds metal to metal well.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  3. #13
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 4,482
    I'm Alex.

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    Quote Originally Posted by walpurgis View Post
    The acrylic adhesive is way stronger than PVA. It's not particularly cheap, but it is excellent stuff. A repair is likely to be stronger than the surrounding cloth.

    I've used it for all sorts of things. It bonds metal to metal well.
    Thank you, that sounds good. A bit like the Polish inventor that invented the strongest glue in the world, couldn't get the top off the bottle. I am allowed to say Polish because I'm half Polish. Dad came over here before WW2.
    Spendorman

  4. #14
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 4,482
    I'm Alex.

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    Quote Originally Posted by struth View Post
    He has various colours but this is the most popular...beige

    http://www.ebay.co.uk/itm/1521324391...%3AMEBIDX%3AIT
    Thank you, two colours look sort of suitable, Peter would have to recover both fronts of course.
    Spendorman

  5. #15
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,625
    I'm Geoff.

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    There are interesting grille cloths on US eBay sites. Worth a look if the original can't be sorted.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  6. #16
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 4,482
    I'm Alex.

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    Thank you, I will pass that on to Peter.
    Spendorman

  7. #17
    Join Date: May 2008

    Location: A Strangely Isolated Place in Suffolk with Far Away Trains Passing By...

    Posts: 14,535
    I'm David.

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    The IIILZ's will need cabinet work too to sound any good, but that's another story - check for buzzy back panels.
    Tear down these walls; Cut the ties that held me
    Crying out at the top of my voice; Tell me now if you can hear me

  8. #18
    danilo Guest

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    Gonna take a wee bit more than new boxes to Patch the 10's.
    They cleverly fitted a 2.5" LF cone voice coil to the standard tannoy 2" diameter Wave guide.
    The resultant gap mismatch is right in the middle of the Prime Voice frequencies.
    10's were Tannoys' stepchild product
    Takes some skilled/careful machine work to turn a suitable ali transition piece... then fit it.

  9. #19
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 4,482
    I'm Alex.

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    Why did they use a larger diameter voice coil than the other units?
    Spendorman

  10. #20
    Join Date: Mar 2012

    Location: Gloucestershire

    Posts: 3,377
    I'm Paul.

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    Quote Originally Posted by spendorman View Post
    Why did they use a larger diameter voice coil than the other units?
    The III-LZ was designed as a near field monitor, not a full range hifi speaker for far field listening. Tannoy wanted to preserve as much of the detail to about 1.5KHz as possible (ie within the middle of speech frequencies) so chose to run with a 2.5 inch voice coil for the LF for greater control and smoothness up to this point. They retained the 2 inch horn. The response problems didn't really happen until around 6KHz up to which point the III-LZ remains a remarkably smooth and linear performer, so it ticked all the right boxes for a near-field monitor and still does.

    However, when applied to hifi use there is an issue above 6kHz where a phase inversion is present. This is caused by the gap between the end of the horn and the end of the voicecoil (ie opening of the main cone) where a short section of tube is parallel sided. It is this section of parallel tube which causes phase inversion of the HF unit. By then, the main LF does very little, and since both horns suffer the same phase inversion, the listener hears absolute phase inversion and not relative phase inversion, so for all practical purposes, it is rarely an issue except for measurement, and this is what may forget when describing them.

    However, the issue can be resolved completely by smoothing he horn using something like a flexible car body filler (great care and skill needed!) so that its mouth exits at the end of the voicecoil tube.

    For what it was designed for, the III-LZ remains fit for purpose although the cabs, as with most Tannoys, do benefit from some stiffening and improvements to internal damping.

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