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Midwest Audio Fest

It’s that time audio enthusiasts!

Registration for the 2019 Speaker Design Competition is now open! Visit midwestaudiofest.com for details and to list your speaker project.
We are excited to see all returning participants, and look forward to meeting some new designers this year, as well!

Be sure your plans include a visit to the Parts Express Tent Sale for the lowest prices of the year, and the Audio Swap Meet where you can buy and trade with other audio fans.

We hope to see you this summer!

Vivian and Jill
2 of 2 < >

Midwest Audio Fest

It’s that time audio enthusiasts! Registration for the 2019 Speaker Design Competition is now open! Visit midwestaudiofest.com for details and to list your speaker project. We are excited to see all returning participants, and look forward to meeting some new designers this year, as well! Be sure your plans include a visit to the Parts Express Tent Sale for the lowest prices of the year, and the Audio Swap Meet where you can buy and trade with other audio fans. We hope to see you this summer! Vivian and Jill
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Helium - a true micromonitor

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  • Re: Helium - a true micromonitor

    Ohhhh...those are purdy. Great camera work too.
    Bryan K.

    Midwest Audio Club

    Speedster | Sub Attach | The Wildeman | Sean's NLA Towers | COGAR, COUGAR II and COGAR JR | Triton | Lithium | J-Boom | Trym MLTL | Docere MLTL

    Comment


    • Re: Helium - a true micromonitor

      Sorry if this has already been asked and answered - but has anybody tried the little Peerless PR in this build? Might be a good alternative to squeezing a port into that small box.

      Comment


      • Re: Helium - a true micromonitor

        I tried to model the Peerless PR for this design, but didn't really get any better extension than going sealed. The port is a pain, but it seems to be the only way to go.
        Keep an open mind, but don't let your brain fall out.

        Sehlin Sound Solutions

        Comment


        • Re: Helium - a true micromonitor

          Interesting. The little Peerless PR has (IIRC) an FS of 29hz. Maybe this would result in a tuning to low to be useful, given the ND91-4 FS of 74Hz.

          Comment


          • Re: Helium - a true micromonitor

            Originally posted by a_c_arnold View Post
            Another helium build. I went with solid walnut on these so we will see how they hold up. Thanks for the design Scott.
            Absolutely gorgeous!

            A C Arnold - it will be invaluable to wood-working rookies like myself if you could share some details on the build. Any intermediate pictures?

            Best,
            NS.

            Comment


            • Re: Helium - a true micromonitor

              Flyfishingnitin,
              I don't have picks of the build, but I do have a third speaker that is about ready for some varnish that I can get some more detailed shots of. The trick to doing this type of build is to use a box joint jig. I made one from a you tube poster (see link for jig: https://www.youtube.com/watch?v=JYxDXHGRRrk). I prefer a table saw dato or box blade over doing the joints on a router. I get less tear out on the table saw. I used half inch thick stock for this build. Build a basic box using the box joints on 4 corners. I glued a slightly oversized front baffle onto the front. Route the oversized front baffle flush with a flush trim bit. Sand all of the edges even then round over the corners. I used a 3/8 inch round over bit on this build. I decided to rabbet the back of the box so that I could install a removable back panel in order to access the inside. Route the rabbet after rounding over the corners.



              Cut your front holes for the drivers with a combination of circle hole router jig and forstner bits. I rear mounted the woofer because the frame is not very appealing on this driver and I wanted to have as much walnut showing as possible. Sand everything to 220 grit or so and liberally apply 2 to 3 coats of danish oil.



              Let the danish oil dry for about 3 days then apply some varnish. I used satin but gloss would be fine. Here's the speaker after danish oil but before varnish.




              I used a liberal amount of 2 part epoxy on the inside of the cabinet to reinforce the hardwood baffle and the hole for speaker wire terminal because I wanted to reduce the chance of the wood splitting.

              Comment


              • Re: Helium - a true micromonitor

                Great build, i am planning on building a sound bar using your specs. I am ready to order parts, can i use this for the 1mh coil? 269-2124

                Comment


                • Re: Helium - a true micromonitor

                  Originally posted by gompka View Post
                  Great build, i am planning on building a sound bar using your specs. I am ready to order parts, can i use this for the 1mh coil? 269-2124
                  You certainly can use that inductor. It looks very similar to the one I used.

                  I would also like to shout out to a_c_arnold. That is some first rate craftsmanship and a great looking build. My black duratex over MDF flat pack is third or fourth rate by comparison.
                  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
                    I would also like to shout out to a_c_arnold. That is some first rate craftsmanship and a great looking build. My black duratex over MDF flat pack is third or fourth rate by comparison.
                    Yeah Scott but your xo skills are crazy good!
                    Craig

                    Comment


                    • Re: Helium - a true micromonitor

                      Originally posted by gompka View Post
                      the 1mh coil? 269-2124
                      Except for the color, that does look very much like the ones we were getting from dynavox last year. You really do need something that small because there isn't much room inside those boxes. Really nice price, too.

                      Comment


                      • Re: Helium - a true micromonitor

                        Originally posted by a_c_arnold View Post
                        Another helium build. I went with solid walnut on these so we will see how they hold up. Thanks for the design Scott.



                        Those are freaking beautiful!

                        Comment


                        • Re: Helium - a true micromonitor

                          Greetings,
                          I am working on a new version of the Helium.
                          This will be an 8 ohm version using the same driver except in 8 ohms.
                          I will post some pictures later and the new Xover layout.
                          These will be Helium II.

                          There are some changes to the Xover and Scott was so helpful in designing. I have no math skills and equipment to judge except my bad ears.

                          Coming soon!
                          Getting better!:D

                          Comment


                          • Re: Helium - a true micromonitor

                            They aren't 4ohms?

                            Comment


                            • Re: Helium - a true micromonitor

                              Originally posted by corradizo View Post
                              They aren't 4ohms?
                              The Dayton ND91-4 is the designs original mid and is 4ohms. I think he must be referring to a new version with the ND91-8 an 8ohm mid.

                              Comment


                              • Re: Helium - a true micromonitor

                                Originally posted by Jeff F. View Post
                                The Dayton ND91-4 is the designs original mid and is 4ohms. I think he must be referring to a new version with the ND91-8 an 8ohm mid.
                                Oops! I didn't realize that when I built mine. They seem to do just fine on the modest amp that I'm using.

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