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Helium - a true micromonitor

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  • Re: Helium - a true micromonitor

    Originally posted by corradizo View Post
    All of my parts are in! I have a silly question about the port. Can I get 3/4 ID PVC and cut it at a 45 deg angle and glue the pieces together? Alternatively could I use 3/4" copper pipe?
    If you make the cuts with a chop saw or a table saw so that they're smooth and use the right glue you could probably get away with it. It's much easier, though, to use an elbow.

    You could instead use copper or anything you like. Even a cardboard tube.

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    • Re: Helium - a true micromonitor

      Thanks Herman, trying to save space in the box :-). I will pick up and elbow at the store and just see how it goes. Let the dust fly!

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      • Re: Helium - a true micromonitor

        For my Hafnium project, I actually did exactly what you describe - cut a 45 degree angle in PVC and glued the resulting two pieces together with PVC glue to make the port. I used a compound miter saw to make the cut. For my Helium prototype, I used a standard elbow.
        Keep an open mind, but don't let your brain fall out.

        Sehlin Sound Solutions

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        • Re: Helium - a true micromonitor

          You can see the port on post 19 of the Hafnium thread.
          Keep an open mind, but don't let your brain fall out.

          Sehlin Sound Solutions

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          • Re: Helium - a true micromonitor

            Originally posted by corradizo View Post
            Thanks Herman, trying to save space in the box :-). I will pick up and elbow at the store and just see how it goes. Let the dust fly!
            I didn't glue mine, friction alone holds the elbow on.

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            • Re: Helium - a true micromonitor

              Assembled! Need to glue them up and paint.. Note, the tape doesn't hold for much. A little bit of power and Hotel California blew the baffle off!! They already sound big, way bigger than you would guess and very clear. I series connected a 27 and 12ohm resistors to get to 39ohm and tried it on one. It seems to make them more "alive"? I like it better, though I do not have a trained ear. Thanks so much for this great design in such a small package!! My first non-sub speakers rock!!

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              • Re: Helium - a true micromonitor

                I've got a couple of blown ND90 with the magnet removed. Could they be used as a passive radiator? WinIsd sim would require adding 6 grams to get the same response curve (using published specs). Anything I'm missing?

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                • Re: Helium - a true micromonitor

                  Good news for prospective Helium builders! PE is now offering a full range speaker starter kit that includes the ND91-4 and the knock down enclosure kit for approx $70, which is $12 less than buying separately (part number 300-7100). Add the tweeters and crossover parts, and you can have Heliums.
                  Keep an open mind, but don't let your brain fall out.

                  Sehlin Sound Solutions

                  Comment


                  • Re: Helium - a true micromonitor

                    Originally posted by Misch View Post
                    I've got a couple of blown ND90 with the magnet removed. Could they be used as a passive radiator? WinIsd sim would require adding 6 grams to get the same response curve (using published specs). Anything I'm missing?
                    That seems like it should work as long as everything moves freely. You might try to find some lead tape (golf and/or tennis shop should have it) to add the weight.
                    Keep an open mind, but don't let your brain fall out.

                    Sehlin Sound Solutions

                    Comment


                    • Re: Helium - a true micromonitor

                      Originally posted by scottsehlin View Post
                      Good news for prospective Helium builders! PE is now offering a full range speaker starter kit that includes the ND91-4 and the knock down enclosure kit for approx $70, which is $12 less than buying separately (part number 300-7100). Add the tweeters and crossover parts, and you can have Heliums.
                      Link?

                      Edit: Never mind. Got it. Overlooked the part # in your post.
                      Don't worry, if your parachute fails, you have the rest of your life to fix it.

                      If we all did the things we are capable of doing, we would literally ASTOUND ourselves - Thomas A. Edison

                      Some people collect stamps, Imelda Marcos collected shoes. I collect speakers.:D

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                      • Re: Helium - a true micromonitor

                        That's awesome, they sound so nice!!

                        I am thinking to try the Overnight Sensations next. Cannot think of a better gift to give to a friend.

                        Thanks again!

                        Comment


                        • Re: Helium - a true micromonitor

                          Originally posted by scottsehlin View Post
                          Good news for prospective Helium builders! PE is now offering a full range speaker starter kit that includes the ND91-4 and the knock down enclosure kit for approx $70, which is $12 less than buying separately (part number 300-7100). Add the tweeters and crossover parts, and you can have Heliums.
                          Wow....not too shabby!!!

                          Here's the link: http://www.parts-express.com/dayton-...encl--300-7100
                          Bryan K.

                          Midwest Audio Club

                          Speedster | Sub Attachť | The Wildeman | Sean's NLA Towers | CO‹GAR, COUGAR II and CO‹GAR JR | Triton | Lithium | J-Boom | Trym MLTL | Docere MLTL

                          Comment


                          • Re: Helium - a true micromonitor

                            Originally posted by scottsehlin View Post
                            Good news for prospective Helium builders! PE is now offering a full range speaker starter kit that includes the ND91-4 and the knock down enclosure kit for approx $70, which is $12 less than buying separately (part number 300-7100). Add the tweeters and crossover parts, and you can have Heliums.
                            PE should mention this in the product description as a better-sounding alternative to the less-expensive full range option. Make it a one-click purchase option.

                            Comment


                            • Re: Helium - a true micromonitor

                              I'm so tempted to get parts for these, I already have some ND91's in small ported cabs out in the garage, I'm half way finished already, lol.
                              My modest builds:
                              Armadillo TM, A.K.A. Lil' Dillo
                              Tarkus/Armadillo build #2
                              Armadillo Center Channel
                              Au-Rock-O Sub
                              Tarkus
                              Staining MDF tutorial

                              Comment


                              • Re: Helium - a true micromonitor

                                Originally posted by Herman Trivilino View Post
                                PE should mention this in the product description as a better-sounding alternative to the less-expensive full range option. Make it a one-click purchase option.
                                Herman, can you check your inbox please? Thanks.
                                Bryan K.

                                Midwest Audio Club

                                Speedster | Sub Attachť | The Wildeman | Sean's NLA Towers | CO‹GAR, COUGAR II and CO‹GAR JR | Triton | Lithium | J-Boom | Trym MLTL | Docere MLTL

                                Comment

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