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ND105-ND25 mini

rjj45rjj45
edited September 2021 in DIY

Started putting these together about a year ago, then priorities changed and other projects took center stage.
And no, it doesn't have a greek name.....

Drivers: ND105-4
ND25FA-4

4 Liter ported box with 1 inch PVC port 4 inches long. Unibox says 58Hz F3, but I think it's more like 45Hz.
12mm Baltic Birch with amber shellac finish.
Bass is deep and satisfying at normal volumes.
These would make a nice HT surround or desktop near field speaker.
Crossover tuning took me 20 minutes (!!), and is pretty darn flat with a 25 dB reverse null.

More later.

But Chahly - Stahkist don't want speakers that look good, Stahkist wants speakers that sound good!
Tagged:
DanPdynamojoeybuttsScottSsquamishdrocPWRRYDTurn2

Comments

  • WolfWolf

    I liked my foray with those tweeters as well. I see you agree with the higher xover point for them sounding better.
    Nicely done!

    rjj45

    InDIYana Event Website

  • Tom_STom_S

    Nice mini-monitors! I like the sound of those tweeters too. Getting a pair that matched was the main problem I had with them.

  • rjj45rjj45

    Thanks guys!

    But Chahly - Stahkist don't want speakers that look good, Stahkist wants speakers that sound good!
  • KornbreadKornbread

    How much does flush mounting change things?

  • rjj45rjj45

    @Kornbread said:
    How much does flush mounting change things?

    For these drivers, probably not a lot, since the frames are so thin
    I’ve got a pair of RS150 - XT25 that I recently built and measures very smooth on axis. I assume problems if any would show up off- axis.

    But Chahly - Stahkist don't want speakers that look good, Stahkist wants speakers that sound good!
  • rjj45rjj45

    final crossover. Note tweeter reverse polarity

    But Chahly - Stahkist don't want speakers that look good, Stahkist wants speakers that sound good!
  • PWRRYDPWRRYD

    What? No Zobel on the woofer and L-pad on the tweeter? Grumpy would be sad :anguished:

    And will they do a strong 40 Hz in that box :o

    rjj45
  • PWRRYDPWRRYD

    All picking on Roemer aside I like what you did with those.

    rjj45
  • Tom_STom_S

    @PWRRYD said:
    What? No Zobel on the woofer and L-pad on the tweeter? Grumpy would be sad :anguished:

    And will they do a strong 40 Hz in that box :o

    So that's what I've been doing wrong all these years!! :s

  • PWRRYDPWRRYD

    @Tom_S said:

    So that's what I've been doing wrong all these years!! :s

    You must have not read Speaker Builder 201 ;)

    rjj45
  • ugly_wooferugly_woofer

    Most of us should probably read 201 or just zobel the shit out of everything.

  • ani_101ani_101

    "Zobel"..... Z...Z...z.... Too far down the index, i am still stuck at "Active"

    6thplanet
  • ani_101ani_101

    Nice small build....

  • rjj45rjj45

    Thanks everyone!
    Yes, bass response is great, especially considering the 4L volume.
    I previously used some ND91s in a few builds, and was not really happy with them, and received
    advice that the ND105s are much better. And they are! Cleaner,stronger and deeper.

    After all these years, used the last of those $.10 Mad 10uF caps. We need more buyouts like that.

    ani_1016thplanet
    But Chahly - Stahkist don't want speakers that look good, Stahkist wants speakers that sound good!
  • jr@macjr@mac

    I think they were $0.60, but yeah - great buyout.

    rjj45
    I have a signature.
  • rjj45rjj45
    edited September 2021

    Sometimes you shouldn't even ask the question - sometimes ignorance is bliss.
    These little fellows sound pretty good, but I took off axis measurements and normalized to the on axis FR.
    Crikey! Does not look very good. I am assuming that the big red vertical band between 4-5K is due solely to the narrow
    cabinet, and nothing can be done. I don't really hear any problems in the power response. Go figure.

    AAAAHHHH! Figured it out!
    Since I have about a 5 dB dip at 4Khz on axis, when I normalized the off axis curves, this artificially makes that region appear to be way too hot. In reality, the on axis there is a little depressed, and the off axis curves measure fairly flat.

    But Chahly - Stahkist don't want speakers that look good, Stahkist wants speakers that sound good!
  • D1PP1ND1PP1N

    Nice build. I have a few ND drivers im trying to figure out what ill ever do with so thanks for sharing.

  • rjj45rjj45

    @D1PP1N said:
    Nice build. I have a few ND drivers im trying to figure out what ill ever do with so thanks for sharing.

    I like the ND105, and will use it again...

    But Chahly - Stahkist don't want speakers that look good, Stahkist wants speakers that sound good!
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