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Thread: ESL57, banishing the sweet spot

  1. #1
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 4,392
    I'm Alan.

    Default ESL57, banishing the sweet spot

    Something I have thought about for a long time, adding a wide dispersion tweeter to the ESL57.
    The sweet spot really is narrow for the top registers, so if you are not sat in the sweet spot the treble can seem a fair bit down in level.

    So I've finally got around to it and sourced some HiVi RT1C-A Planar Isodynamic tweeters. They are 5 ohms so I have padded them out to 8 ohms, the drop in efficiency is welcome as the tweeters are well in excess of the '57s sensitivity. They are installed on top of the '57s as shown:

    [IMG][/IMG]

    I've ordered some variable L pads to control the level which haven't arrived yet, so the sound is a tad bright (understatement)

    I crossed them in at about 5KHz, they augment the '57s treble rather than replacing it.

    [IMG][/IMG]

    Has it banished the sweet spot? Totally annihilated it
    Firebottle - for the no bottleneck approach.

    I love Hendrix for so many reasons. He was so much more than just a blues guitarist - he played damn well any kind of guitar he wanted. In fact I'm not sure if he even played the guitar - he played music. - Stevie Ray Vaughan

  2. #2
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 37,191
    I'm Geoff.

    Default

    Ah. Nice one Alan!

  3. #3
    Join Date: Sep 2013

    Location: North Island New Zealand

    Posts: 890
    I'm Chris.

    Default

    I have never had an issue with dispersion from ESL57, there is no sweet spot, just
    equal wide gorgeous stereo sound.

  4. #4
    Join Date: Jan 2013

    Location: Bristol

    Posts: 4,279
    I'm Justin.

    Default

    I remember a pair at Scalford with a ribbon tweeter on top. Not sure what frequency it cut in at, but that was just bizarre. As you walked between the speakers you'd move in and out of multiple HF hotspots.

    Put it this way Alan, they sounded far less even than your pair did at the Midlands do as you moved around.
    Double slit experiment enlightened.

  5. #5
    Join Date: Oct 2012

    Location: NE England

    Posts: 4,175
    I'm Jez.

    Default

    They do indeed have a very narrow sweet spot... Nothing else comes close in my experience. I can't see this not causing colouration etc though personally... When in the sweet spot you will be hearing the full correct amount of treble from the ESL's plus the treble from the tweeter I would have thought...

  6. #6
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 4,392
    I'm Alan.

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    Your thinking is of course right Jez, however when not in the sweet spot I think the compromise is a better one.

    I've always wanted a little extra treble from the stats anyway, now I have the L pads fitted I can dial it in to whatever level I want

  7. #7
    Join Date: Oct 2012

    Location: NE England

    Posts: 4,175
    I'm Jez.

    Default

    Quote Originally Posted by Firebottle View Post
    Your thinking is of course right Jez, however when not in the sweet spot I think the compromise is a better one.

    I've always wanted a little extra treble from the stats anyway, now I have the L pads fitted I can dial it in to whatever level I want
    Fairy snuff... I'd put an on-off switch in as well though!

  8. #8
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 4,392
    I'm Alan.

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    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.

  9. #9
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 37,191
    I'm Geoff.

    Default

    How are you finding the treble quality with the HiVi units Alan? It should be good.

  10. #10
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 4,392
    I'm Alan.

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    Excellent actually Geoff, I'm glad I chose them.

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