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Thread: renewing yamaha ns 20 speakers

  1. #21
    Join Date: Dec 2018

    Location: bilbao

    Posts: 40
    I'm arsenico.

    Default first test

    i know that a youtube video is not the best way to share a test, but here you are

    IMHO a chet baker piece with drums, piano, bass and trumpet is one of the most difficult tests for speakers, IMHO again they sound great, pristine clear high tones and smooth silky bass


    https://youtu.be/b6Y1WXesKFg


    happy with them, but,....more to come soon :-)

  2. #22
    Join Date: Mar 2017

    Location: London N2

    Posts: 1,173
    I'm Edward.

    Default

    videos are both totally overexposed, can't see much. Sounds good, but of course limited by the speakers I'm using here and no doubt by the mic you are using.
    Source: Tidal/Roon
    DAC: Metrum HEX, Chevron Paradox, Perreaux

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


  3. #23
    Join Date: Dec 2018

    Location: bilbao

    Posts: 40
    I'm arsenico.

    Default

    Quote Originally Posted by Edwardlon View Post
    videos are both totally overexposed, can't see much. Sounds good, but of course limited by the speakers I'm using here and no doubt by the mic you are using.
    yep, overexposed to focus on sound, house bad and dirty
    i understand the limitations,
    apologies

  4. #24
    Join Date: Mar 2017

    Location: London N2

    Posts: 1,173
    I'm Edward.

    Default

    Quote Originally Posted by dequincey View Post
    yep, overexposed to focus on sound, house bad and dirty
    i understand the limitations,
    apologies
    No need to apologise. As mentioned I'm fascinated by these speakers and its pretty unique driver arrangement.
    Source: Tidal/Roon
    DAC: Metrum HEX, Chevron Paradox, Perreaux

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


  5. #25
    Join Date: Dec 2018

    Location: bilbao

    Posts: 40
    I'm arsenico.

    Default

    and things can be improved substantially,...

    here they are,...




  6. #26
    Join Date: Dec 2018

    Location: bilbao

    Posts: 40
    I'm arsenico.

    Default please help and share your thoughts

    so as you can see i bought these tweeters JA 0506

    my plan is to use them as supertweeters with my ns20 speakers









    i will prepare some base material and put the electronic components on it




    i would like to have you opinion on this, please

  7. #27
    Join Date: Dec 2018

    Location: bilbao

    Posts: 40
    I'm arsenico.

    Default

    OPINION PLEASE:

    to use them as supertweeters i will need to prepare a couple of things, a high cut pass filter + an L-Pad for attenuation

    the characteristics of the Ns20 could be assimilated to the bass JA5002

    This is the data about JA-5002
    Voice coil 66mm dia alminium edge wound voice coil
    Alnico magnet
    impeadance 8 ohm
    f0 : 35Hz
    efficiensy : 92dB/w/m
    f-range : 35Hz~6kHz
    size : W500H680D110(mm)

    and on the other hand the tweeter is:



    the performance curve



    as a summary from specs:


    - the bass is 92dB and frec range up to 6000Hz

    - the tweeter is 115 dB and nice response frec range from 5000Hz

    here is my thinking:

    1- I will cut high pass the tweeter from 5000Hz using a second order filter (a capacitor and a coil); there is a doubt here, to cut at 5000Hz or at 8000Hz ??

    2- I will attenuate around half of the sensitivity gap = the difference (115-92= 23) / 2 = 12dB using a L-Pad filter


    3- this will be the setup: (C and L values are for 8000Hz) where it says CrossOver is the NS20 internal one




    your thoughts ?

    THANK YOU

  8. #28
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 38,400
    I'm Geoff.

    Default

    Can you not plot the natural roll-off of the main tweeter and mirror (reverse) this for the roll-in curve of the supertweeter? Might need a tweak here and there, but it should give a nice result.
    As Wernher Von Braun said, "it's not rocket science!".

  9. #29
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 23,543
    I'm Martin.

    Default

    The speakers already have a tweeter so I don't know what gains you are hoping to make by adding another. From the response you show it doesn't extend much higher than 20Khz anyway. Usually you would look to roll in a supertweeter where the existing tweeter gives out. Do you know the upper FR of the existing tweeter? I guess if it is quite low(15Khz) say then it might be worth trying the supertweeter. Otherwise you are just doubling up on what is there already, you'll get cancellation, reinforcement, comb filter effects. All a bit random it seems to me.
    Martin



    Current Lash Up:

    Technics SLP1200 CD Player * Nelson Pass DCB1 Pre amp / Krell KSA50S Power amp * JM Lab Electra 926 loudspeakers *


    'You fool! To think that your ape-brain could contain the full knowledge of the Krell!'

  10. #30
    Join Date: Dec 2018

    Location: bilbao

    Posts: 40
    I'm arsenico.

    Default

    Quote Originally Posted by walpurgis View Post
    Can you not plot the natural roll-off of the main tweeter and mirror (reverse) this for the roll-in curve of the supertweeter? Might need a tweak here and there, but it should give a nice result.
    thank you, seems a possibility, but unfortunately i do not know how to do this

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