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Thread: renewing yamaha ns 20 speakers

  1. #11
    Join Date: Dec 2018

    Location: bilbao

    Posts: 49
    I'm arsenico.

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    i will replicate the A circuit as it is the one found in the specs drawing



    i will have to recreate the two bridges





    adding resistors from Kiwame, Japanese brand that offers exact resistance values






  2. #12
    Join Date: Dec 2018

    Location: bilbao

    Posts: 49
    I'm arsenico.

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    and using the mundorf capacitors, one 1+1,5 uf in series, and one 100uf directly



    due to their size i have to place them in the other side of the circuit





    please, comment anything that you consider odd or that can be done other way

  3. #13
    Join Date: Dec 2018

    Location: bilbao

    Posts: 49
    I'm arsenico.

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    list of materials

    100uF 50V Mundorf ECap AC PLAIN electrolytic capacitor
    1uF 600V Mundorf MCap Supreme Capacitor
    1.5uF 600V Mundorf MCap Supreme Capacitor
    3R9 5W Kiwame Resistor
    8R2 5W Kiwame Resistor
    16R 5W Kiwame Resistor
    24R 5W Kiwame Resistor

  4. #14
    Join Date: Dec 2018

    Location: bilbao

    Posts: 49
    I'm arsenico.

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    finished the renewal of these crossovers





    silver solder and new cables OFC










  5. #15
    Join Date: Sep 2014

    Location: Northern Ireland

    Posts: 1,052
    I'm John.

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    Looks great. Those Mundorfs take time to run in. Give them a few days use before making any judgements. They will sound dull and flat for a while, at least mine did. Love the speakers

  6. #16
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 7,780
    I'm AnDreW.

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    Quote Originally Posted by JohnJo View Post
    Looks great. Those Mundorfs take time to run in. Give them a few days use before making any judgements. They will sound dull and flat for a while, at least mine did. Love the speakers
    +1 with everything John says, I remember thinking I'd made a massive mistake when I had my Tannoy's upgraded. Fantastic thread arsenico.
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  7. #17
    Join Date: Mar 2017

    Location: London N2

    Posts: 1,453
    I'm Edward.

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    Really interesting!

    I'm intrigued by this type of speaker (back facing bass driver) so did a bit of googling. Came across this blog entry from Japan which goes into a lot of interesting detail.

    Here is a translation.
    Source: Tidal/Roon
    DAC: Metrum HEX, Chevron Paradox

    Pre: LDR
    Amp: Radford Revival STA25 V,
    Sugden Masterclass 2018 spec
    Speakers: Tannoy Berkeley & Eaton, Kudos Cardea


  8. #18
    Join Date: Dec 2018

    Location: bilbao

    Posts: 49
    I'm arsenico.

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    Quote Originally Posted by JohnJo View Post
    Looks great. Those Mundorfs take time to run in. Give them a few days use before making any judgements. They will sound dull and flat for a while, at least mine did. Love the speakers
    thank you, will delay any judgement, ...but i must say they sound fantastic even now

  9. #19
    Join Date: Dec 2018

    Location: bilbao

    Posts: 49
    I'm arsenico.

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    Quote Originally Posted by REXTON View Post
    +1 with everything John says, I remember thinking I'd made a massive mistake when I had my Tannoy's upgraded. Fantastic thread arsenico.
    thanks

    Quote Originally Posted by Edwardlon View Post
    Really interesting!

    I'm intrigued by this type of speaker (back facing bass driver) so did a bit of googling. Came across this blog entry from Japan which goes into a lot of interesting detail.

    Here is a translation.
    yes, my thought was exactly that, i was intrigued so i wanted to try them, not easy as there are not many available for sale in europe, and shipping such a huge and heavy speakers is indeed expensive

    i started with a pair of ns230 just to try the open-back faced bass, i was very positively surprised by them, so the big brothers were the nxt target

    thank you very much for the japanese blog, there is not much information on these speakers

  10. #20
    Join Date: Dec 2018

    Location: bilbao

    Posts: 49
    I'm arsenico.

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    sound test,
    Last edited by dequincey; 18-12-2018 at 20:11.

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