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Thread: Sierra-2 Development Thread

  1. #601
    Join Date
    May 2013
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    Austin, TX
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    19

    Default Re: Sierra-1 NrT: Next phase?


  2. #602
    Join Date
    Aug 2003
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    Manhattan Beach, California
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    7,070

    Default Re: Sierra-1 NrT: Next phase?

    Hey! I think that's different from the prototype I saw!
    -curtis

  3. #603
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    May 2013
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    51

    Default Re: Sierra-1 NrT: Next phase?

    What a cute baby ribbon

  4. #604
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    Nov 2010
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    59

    Default Re: Sierra-1 NrT: Next phase?

    In terms of length of ribbon area, looks about the same as ribbon tweet on my Sierra towers but the width looks to be almost half or less in comparison. Is that an unfinished cabinet? It looks more like an unfinished cabinet than natural?

  5. #605
    Join Date
    Nov 2011
    Location
    Space Coast, FL
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    578

    Default Re: Sierra-1 NrT: Next phase?

    Quote Originally Posted by avsnoob10 View Post
    In terms of length of ribbon area, looks about the same as ribbon tweet on my Sierra towers but the width looks to be almost half or less in comparison.
    I agree with you here. The height/length of the ribbon appears nearly identical to the custom 70-20XR. Width is a bit harder to estimate because of the picture's skewed angle--1/3 to 1/2 the width of the 70-20XR looks to be about right.

    The faceplate itself is remarkably similar to the current RAAL tweeter: the faceplate texture, the "zigzag" toothed edges (INOX), and the type of inset screws. Even the "cheesecloth" type barrier looks identical. However, it's obviously a smaller and lighter tweeter, too, because the 70-20XR has four inset hex screws while this ribbon has just two.

    Point being, I'll be very surprised if this isn't a custom ribbon from RAAL.*

    Quote Originally Posted by avsnoob10 View Post
    Is that an unfinished cabinet? It looks more like an unfinished cabinet than natural?
    Yeah, I'm pretty darn sure that's an unfinished cabinet, hence au naturel. The vertically-laminated bamboo is much more apparent and carries more of a whitish color. These are prototype speakers, so it makes sense not to used a finished cabinet.


    *I reserve the right to be incorrect about the tweeter manufacturer.


    @ Curtis:

    Looks like it's time to drop by the Ascend Skunk-Works bunker for another listen.
    -Jacob

  6. #606
    Join Date
    Aug 2003
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    USA
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    5,593

    Default Re: Sierra-1 NrT: Next phase?

    Indeed, it is a custom built RAAL ribbon tweeter designed specifically for our requirements. It is 10mm in width (same width as the retail 70-10) and 1/2 the width of the OEM only 70-20 we use in our Towers. This tweeter marks the conclusion of an exhaustive project we started with Aleksandar (owner and chief designer at RAAL) nearly 2 years ago.

    In this application, I must say I actually prefer this tweeter to the 70-10 as the response is more linear (with a low end roll off and frequency response shape specific to our needs) and it does not require any foam pads to tame the top end. It can not be crossed as low as the 70-10 (certainly not as low as the 70-20 our towers use) and it does not offer the same overall power handling, but -- in the way we are implementing it, we easily hit 108dB in our extremely well damped listening room measured at 12 feet back so power handling and dynamics are not an issue. This new tweeter has very broad horizontal dispersion but the polar response is not quite as good as the 70-20xr we use (I don't think ANY tweeter can match the remarkable polar response of the 70-20)

    At some point there will be a retail version of this tweeter. This is something Aleks and I have discussed in detail as he needs to recoup his development costs, but while the retail version will look similar, it is not the same unit and the two have considerably different performance characteristics.

    There is more to the Sierra-2 than just the custom RAAL ribbon tweeter though... More to come as we get closer
    Last edited by davef; 09-30-2013 at 02:50 PM.
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    Good Sound To You!

    David Fabrikant
    www.ascendacoustics.com

  7. #607
    Join Date
    Nov 2011
    Location
    Space Coast, FL
    Posts
    578

    Default Re: Sierra-1 NrT: Next phase?

    I think I understand what you're not saying.

    In any case, thanks for the confirmation on the manufacturer. Some folks will be mighty pleased to hear that.
    -Jacob

  8. #608
    Join Date
    Nov 2009
    Posts
    291

    Default Re: Sierra-1 NrT: Next phase?

    If the upgrade cost are within my affordable range, i think i may built another cabinet for the old drivers, or the upgrade drivers, depending how well the new cabinet are and the difference between MDF and bamboo.
    Last edited by RicardoJoa; 09-28-2013 at 11:57 PM.

  9. #609
    Join Date
    Mar 2004
    Location
    SouthWest of Cleveland
    Posts
    1,930

    Default Re: Sierra-1 NrT: Next phase?

    Dave, that's awesome that the tweeter is, indeed, a RAAL! It looks great. Can't wait for more info on this little gem. Also can't wait for pics and info on the new mid-woofer!
    Ed

    * Sierra-2EX's W/V2 crossover upgrade
    * (2) Rythmik F12's
    * Parasound Halo P6
    * Audio by Van Alstine DVA-M225 Monoblock Amps
    * MiniDSP 2x4HD For Sub calibration
    *World's Best Cables Canare 4S11 speaker cables

  10. #610
    Join Date
    Aug 2003
    Location
    USA
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    5,593

    Default Re: Sierra-1 NrT: Next phase?

    Quote Originally Posted by Mag_Neato View Post
    Dave, that's awesome that the tweeter is, indeed, a RAAL! It looks great. Can't wait for more info on this little gem. Also can't wait for pics and info on the new mid-woofer!
    Wait, who said anything about a new mid-woofer? Isn't a custom RAAL true ribbon tweeter enough
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    Good Sound To You!

    David Fabrikant
    www.ascendacoustics.com

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