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Helium - a true micromonitor

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  • I agree, not exactly a Helium - but an adaptation that will make sense for certain applications. I am curious as to how close the ND90 is as a drop-in to the ND91 from a crossover perspective. Looking at the graphs, the ND90 seems to have a few dB higher output above about 1.5 kHz. The ND91 has a breakup peak around 15 kHz that the ND90 doesn't show. As Jake suggests, this might wind up helping to balance the increased bass output that the ND90 will have in his enclosure. The Helium design as it is really is more of a balanced design than a perfectionist design due to the simple fact that small size and full-ish sound are top priorities. There is very limited space for port tubes and crossover components.

    From a more conceptual standpoint, I have played with a few ND90 designs. For bass and box size, I wind up coming back to the ND105 as something I can get similar extension out of in the same enclosure size, but with more output capability due to the larger cone. The one thing that the ND90 does better is higher frequencies. So, if I get around to an ND90 design, it will probably be with something like one of the small AMT tweeters (the Mini-8 or the Pod-4) that really need to cross around 5 kHz.
    Keep an open mind, but don't let your brain fall out.

    Argon | Helium | Lithium | LithMTM | Hafnium
    Mercury | Matrix | Shrubbery

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    • Hi all, a very good and necessary project, I really liked it, does anyone have the video or whether listening to music without YouTube? Case I already have ready, I want to repeat this life hack ). Price really delivery is not very adequate $152, so I think justify whether these speakers are such a cost?
      Last edited by doom; 11-29-2017, 11:16 AM. Reason: added

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      • Doom, I think you can build this cheaper than your estimate. You can buy a single 2x2' mdf board at lowes or home depot for $6, you can also buy the pvc pipe used for the port there. Much cheaper to build your enclosures. Also you can use bp electrolytic caps instead of poly, or just use a poly cap on the tweeter and electrolytic on the driver. Cost should be around $100. Definitely worth that price any day.

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        • box to me already almost ready, now the price goes.
          Products (12)
          $104.18

          Promo Savings
          -$10.00

          Shipping
          $52.52

          Order Total
          $146.70















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          • here's a box of 200 grams more than 0.04 feet, I want to make the port top and the bottom to put a sack of sand, 200 grams, would that be a solution?

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            • If your spending the money, I would not use those boxes. Buy the flat pack, or make your own from a 2'x2' piecell of mdf

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              • Originally posted by doom View Post
                here's a box of 200 grams more than 0.04 feet, I want to make the port top and the bottom to put a sack of sand, 200 grams, would that be a solution?
                First time I saw a metric tape measure

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                • Sometimes everything in life happens for the first time.

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