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Thread: ESL57, banishing the sweet spot

  1. #11
    Join Date: Feb 2011

    Location: glasgow

    Posts: 1,989
    I'm tony.

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    Brian gave me a try of his supertweeters had a wee play about positioning wise. firing vertically velcroed to the 57s they seem to do the business.

    he never got them back-57s are singing....

  2. #12
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 3,865
    I'm Alan.

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    Excellent Tony

  3. #13
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 515
    I'm Chris.

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    Quote Originally Posted by Firebottle View Post
    The L pads go from zero to max (straight through) so no problem.

    I have been turning the level down as I have been listening to get a good compromise.
    Which ones did you use?

  4. #14
    Join Date: Feb 2011

    Location: glasgow

    Posts: 1,989
    I'm tony.

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    batpure i think. Brian housed them in a wee wooden box.
    They come from japan and were about 50 quid but Brian got stung for import duty this time round to replace my ones so mid 60s.

  5. #15
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 3,865
    I'm Alan.

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    Quote Originally Posted by bumpy View Post
    Which ones did you use?
    https://www.ebay.co.uk/itm/Monacor-S...sAAOSwiYlaDRag

    Note that these are 8 ohm so some resistive padding may be required if the tweeter used isn't 8 ohms, as in my case.

  6. #16
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 515
    I'm Chris.

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    Quote Originally Posted by Firebottle View Post
    https://www.ebay.co.uk/itm/Monacor-S...sAAOSwiYlaDRag

    Note that these are 8 ohm so some resistive padding may be required if the tweeter used isn't 8 ohms, as in my case.
    Thanks

    Is there some trick whereby you can adjust it to give the right level for the driver, then take some measurement of the volume control and replace it with two quality resistors. You can probably tell I am no expert at electronics.

  7. #17
    Join Date: Mar 2010

    Location: Sheffield

    Posts: 2,509
    I'm Simon.

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    Misterdog (PFM) had a set of small ribbons on his, he's recently swapped them for a set of ADAM's AMT ribbons. Both had the effect of lifting the height of the speakers. Call it a broader sweetspot, more diffuse, less focussed. I doubt it's more accurate in terms of lobing, defraction, timing etc, just an easier listen in terms of accommodation.
    Kuzma Stabi/S 12", (LP12-bastard) DC motor and optical tacho psu, Benz LP, Paradise (phonostage). MB-Pro, Brooklyn dac and psu, Bruno Putzeys balanced pre, mod86p dual mono amps, Yamaha NS1000m

  8. #18
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 515
    I'm Chris.

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    Anyone??

    "Is there some trick whereby you can adjust the L Pad volume control to give the right level for the driver, then take some measurement of the volume control and replace it with two quality resistors. You can probably tell I am no expert at electronics."

  9. #19
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 3,865
    I'm Alan.

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    This shows how to calculate for an entered value of required attenuation

    http://www.sengpielaudio.com/calculator-Lpad.htm

    With a constant impedance L pad 'volume control' it is impossible to measure the resistance to ascertain the attenuation, as the impedance is designed to stay constant.

  10. #20
    Join Date: Apr 2016

    Location: Bishops Stortford

    Posts: 515
    I'm Chris.

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    Thanks Alan

    Looks like a case of laying in a few cheap resistors to experiment with.

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