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on Sale - $55/pr (drivers & XO)

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  • adjustablegroover
    replied
    Re: for agroover

    Thanks again Chris...

    No problems... only solutions 'round here...

    Cheers,

    Richard

    Leave a comment:


  • Chris Roemer
    replied
    Re: for agroover

    I brought this out here, 'cause you were wearing me down having to thread my way back into this post w/each additional question.

    Initially, you said you had a 4.5"w cavity in which to build these. That's EXactly the ID of MY recommended box for them, so I figured "no problem".

    NOW, it seems as though you're wanting to stuff an actual completed box withIN that 4.5" width. If you can get this to work, you should have pretty awesome bass, BUT . . . w/out knowing any more about the particular installation you've got planned, I'm beginning to worry.

    Even w/ 5/8" walls, you'll have to remove 1/4" on each side just to get the driver to fit (leaving you w/ only 3/8").
    If you look at the ND105 spec sheet, you can see that basically the backside of the driver exhausts nearly horizontally (rather than backwards, like most larger drivers do). You will basically only have half of the woofers' breathing space left, since, even w/routering the sidewalls, you still have no room for a backside roundover (which has been highly recommended throughout this thread). I think I used a 3/8" roundover bit on the back of the woofer holes in the baffle just to let those little guys breathe.

    I'd recommend closing off your "cavities" to attain the required internal volume for the build and just inserting the front baffle w/the drivers and vent on it, IF YOU CAN?

    If not, I certainly wish you luck. On your calc'd internal volume of 0.55 cf, I'd use a 2"id x 6" long port tube w/a generous roundover on the baffle. Should tune the box to the mid 40s. Keep us posted.

    Leave a comment:


  • adjustablegroover
    replied
    Re: on Sale - $55/pr (drivers & XO)

    Ok... all parts ordered... $50 shipping to Australia... Ouch!!!

    More questions...

    I have worked out that if I use 16mm MDF, I can have internal dimensions of 82W x 250D x 774H = 15.86 litres which is around 56cf. Good?

    Because of the size of the ND105s, I will have to partially route out some of the walls on either side of each enclosure (about 6mm either side).

    Do you think this will affect anything?

    Also, I think I will need to have the port coming out the front and I have read a few posts that suggest different port lengths and diameters.

    What is the optimum diameter and length of the port tube, and given my unusual box size, is 10" up and centred from the bottom still a good place to position it?

    Thank you again in anticipation,

    Richard

    Leave a comment:


  • adjustablegroover
    replied
    Re: on Sale - $55/pr (drivers & XO)

    Thanks again Chris... I think I'll just stick strictly to your plan...

    Cheers,

    Richard

    Leave a comment:


  • Chris Roemer
    replied
    Re: on Sale - $55/pr (drivers & XO)

    The 0.25mH is fine.

    The 2.0mH's DCR of 1.2 ohms is not what I'd use. Try to find one w/a lower DCR.
    0.6 ohms would be the lowest I'd recommend (but the one you're referencing WILL still work, but it'll reduce the woofers' output a bit and alter the box tuning/bottom end rolloff some).
    The larger gauge air-cores can get expensive, but a #18 (2mH) will be better than the #20, and a #15 or #16 will be even better.
    The "iron core" coils would be what you're looking for. It's the core that will net you the lowest DCR.

    Leave a comment:


  • adjustablegroover
    replied
    Re: on Sale - $55/pr (drivers & XO)

    Hello again... Just a couple of questions about the inductors.

    I'm in Australia, and I'm trying to source what I can locally. I've found these inductors here, but I don't know enough about them to decide if they are right...

    2 mH 20AWG Air Core 1.18 ohm DCR 1062

    and

    0.25 mH 18AWG Air Core 0.22 ohm DCR 1076

    Will they be ok, or do I need the exact ones that are mentioned in the thread?

    Thanks again,

    Richard

    Leave a comment:


  • adjustablegroover
    replied
    Re: on Sale - $55/pr (drivers & XO)

    Great news... Thanks for the replies fellas...

    Leave a comment:


  • fastbike1
    replied
    Re: on Sale - $55/pr (drivers & XO)

    As far as the amp, it will do provided that the room isn't very large and that the friend isn't listening at loud levels.

    You'll only get about 101 dB max at full power on the Pioneer, maybe 95 peak about 2-3 meters.

    Leave a comment:


  • Chris Roemer
    replied
    Re: on Sale - $55/pr (drivers & XO)

    You shouldn't have any width issues, as long as the woofers fit in there and you can adequately relieve the backside of the baffle so they can breathe adequately.
    These are a "very friendly" load to an 8 ohm rated amp, staying considerably above the "3-ohm dip" seen by most "4-ohm rated" speakers. I'd call them a solid 6-ohm design.

    Leave a comment:


  • adjustablegroover
    replied
    Re: on Sale - $55/pr (drivers & XO)

    Alrighty then... Count me in.

    Just a couple (perhaps silly) questions from a newcomer to audioland.

    I have a very limited width cavity (115mm to be precise) in which to build these.

    My questions are:

    Will this project still work if I keep the overall internal box volume for NTNs the same as the Chris Roemers specified .55 cf?

    also,

    I'm building for a friends birthday present and this is his amplifier. Would it suit these speakers?

    http://www.hifiengine.com/manual_lib...r/sa-408.shtml

    Any advice would be greatly appreciated.

    Thank you in anticipation,

    Richard

    Leave a comment:


  • brianbunge
    replied
    Re: on Sale - $55/pr (drivers & XO)

    We both really enjoy them. When we started building them forever ago I was in a different place that had a bigger wall so that's why these are so close together. Paired with a little Cerberus sub they do everything I need them to in a bedroom. They'd even be great in a medium-sized living room with a bigger sub.

    The Cerberus I got when I traded some drivers for it. It just happens to match some little maple speakers I gave my daughter so it'll go in her room after my dad builds me a new one that matches these speakers. I'll be mounting it downfiring with taller spikes, sort of like a Rega Vulcan sub I saw years ago that's about the same size.

    Anyway, here's a pic of my and my dad's towers together.

    Leave a comment:


  • Chris Roemer
    replied
    Re: on Sale - $55/pr (drivers & XO)

    Thumbs up? How'd your dad like them?

    Leave a comment:


  • brianbunge
    replied
    Re: on Sale - $55/pr (drivers & XO)

    My dad built the cabinet for me. I traded him my old Dayton RS15" HO sealed sub and amp for it.

    Leave a comment:


  • Derekj
    replied
    Re: on Sale - $55/pr (drivers & XO)

    Looks great! Did you build the stereo cabinet as well or just paint it to match?

    Leave a comment:


  • brianbunge
    replied
    Re: on Sale - $55/pr (drivers & XO)

    Got these finished a few weeks ago!

    Leave a comment:

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