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The Miura's - A Dayton CF120 Build

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  • The Miura's - A Dayton CF120 Build

    It's been a bit of a road to get here but I finally got these done! As I said in my build thread here quite a few of us won these drivers as door prizes over the summer at various DIY events. I know Wolf has simmed a design with this driver - the Mangusta's - but I don't think anyone else has a design with them yet.



    Design goals for this project was for a small two way for kitchen/bedroom use that didn't take up too much room and was fairly inexpensive to build, so I paired the woofer with the Dayton ND25FA tweeter. Now that the CF120's price dropped almost $20 these can be made for about $150 a pair plus the cabinets. The cabinet is small at only 5lt and tunes the woofer to 60hz with 2x6" port. Crossover is a 12db on the woofer and 18on the tweeter centered around 3k. I did struggle with the crossover a bit, adding a notch filter and a few other components trying to smooth the curve out, but ended up back with a simple 6 component circuit. Sometimes less is more I guess. They are finished with a Maple veneer and have 4 coats of rubbed on poly. I picked the lighter coloured veneer as I wanted a nice black/white contrast to the speakers.



    I set them up last night in the garage with one of those SMSL chip amps that Rory had posted about the other week. I have to say the amount of bass that came out of these was pretty impressive for a little 4" driver. Compared to my ID entry this year these guys are a little more laid back on the top end but have a pretty nice overall response.



    In room response,



    Impedance,



    Final sim, (I think...)



    This was a fun little project and I look forward to listening to them quite a bit over the holidays. They will be my main speakers for the next little while as I sold my ID speakers last week, and I haven't started my next build yet (an SB floorstander).

    Merry Christmas!
    Last edited by Derekj; 12-22-2015, 08:38 PM.
    See my projects on Instagram and Facebook

  • #2
    Re: The Miura's - A Dayton CF120 Build

    Those look terrific. Glad you used a larger port, I've built smaller speakers w/ 4" woofers and have regretted the 1" D port I used, it chuffed quite a bit.

    Comment


    • #3
      Re: The Miura's - A Dayton CF120 Build

      Ooh, nice job with the cab finish. Great project!
      Some people are addicted to Vicodin. I'm addicted to speaker building.

      The Chorales - Usher 8945A/Vifa XT25TG Build
      ESP Project 101 Lateral MOSFET Amplifier
      LM4780 Parallel Chipamp
      Sonata Soundbar Project
      The Renditions - Active/Passive Towers

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      • #4
        Re: The Miura's - A Dayton CF120 Build

        Nice! Love those simple XO's .
        Kenny

        http://www.diy-ny.com/
        DIY NY/NJ 2014 https://www.youtube.com/watch?v=FGwA...ature=youtu.be
        Man does not live by measurements alone, a little music helps.

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        • #5
          Re: The Miura's - A Dayton CF120 Build

          I really like that driver combination. Great finish. Simple x-o. That's first rate project that I think people would like to build.
          John H

          Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

          Comment


          • #6
            Re: The Miura's - A Dayton CF120 Build

            They look great. How do they sound in the midrange? The carbon cones do look a lot more expensive than the price (are Dayton phasing these out?)

            Comment


            • #7
              Re: The Miura's - A Dayton CF120 Build

              Going to be confusing since mattsk8's 3 ways have the same name.
              craigk

              " Voicing is often the term used for band aids to cover for initial design/planning errors " - Pallas

              Comment


              • #8
                Re: The Miura's - A Dayton CF120 Build

                Originally posted by craigk View Post
                Going to be confusing since mattsk8's 3 ways have the same name.
                Changed the name to the Miura Jr's hopefully that doesn't confuse people.
                See my projects on Instagram and Facebook

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                • #9
                  Re: The Miura's - A Dayton CF120 Build

                  Nice project Derek. I'd say you got that vaneering thing down pat.
                  " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

                  Quote Originally Posted by hongrn. Oct 2014
                  Do you realize that being an American is like winning the biggest jackpot ever??

                  http://www.midwestaudioclub.com/spot...owell-simpson/
                  http://s413.photobucket.com/albums/pp216/arlis/

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                  • #10
                    Re: The Miura's - A Dayton CF120 Build

                    Originally posted by craigk View Post
                    Going to be confusing since mattsk8's 3 ways have the same name.
                    Funny thing is that:
                    http://techtalk.parts-express.com/sh...81#post2076281

                    Mattsk8 I believe announced the name at Meniscus in September, and stated it 'Miera', not 'Miura'.

                    I applaud Derek for changing his name of his project to avoid confusion, but Mattsk8 actually was second in line.

                    Later,
                    Wolf
                    "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                    "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
                    "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
                    "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

                    *InDIYana event website*

                    Photobucket pages:
                    https://app.photobucket.com/u/wolf_teeth_speaker

                    My blog/writeups/thoughts here at PE:
                    http://techtalk.parts-express.com/blog.php?u=4102

                    Comment


                    • #11
                      Re: The Miura's - A Dayton CF120 Build

                      Originally posted by Wolf View Post
                      Funny thing is that:
                      http://techtalk.parts-express.com/sh...81#post2076281

                      Mattsk8 I believe announced the name at Meniscus in September, and stated it 'Miera', not 'Miura'.

                      I applaud Derek for changing his name of his project to avoid confusion, but Mattsk8 actually was second in line.

                      Later,
                      Wolf
                      Not that the name means anything at all to me, I honestly could just change it on mine... But they were Miura, named after the mid-engine Lamborghini. This fit because I later also found out that Lambo got the name from the Miura Ranch in Spain, which was well known for raising hard to ride bulls. And since those 3 ways were such an uphill battle for me, I thought it fit. I actually came up with it back in June, but I don't have a thread to prove that.

                      But seriously Derek, your build looks incredible and I think the fact that you finished yours prior to me finishing mine (mine are still MDF :o), plus you technically announced it first in that thread Ben linked, means you should have it. Or if you're OK with it, keep Jr too. Either way, nice build and it's just a name.
                      "The ability of any system to produce exceptional sound will be limited mainly by the capability of the speakers" Jim Salk
                      "Audio is surely a journey full of revelations as you go" JasonP

                      Comment


                      • #12
                        Re: The Miura's - A Dayton CF120 Build

                        Originally posted by mattsk8 View Post
                        Not that the name means anything at all to me, I honestly could just change it on mine... But they were Miura, named after the mid-engine Lamborghini. This fit because I later also found out that Lambo got the name from the Miura Ranch in Spain, which was well known for raising hard to ride bulls. And since those 3 ways were such an uphill battle for me, I thought it fit. I actually came up with it back in June, but I don't have a thread to prove that.

                        But seriously Derek, your build looks incredible and I think the fact that you finished yours prior to me finishing mine (mine are still MDF :o), plus you technically announced it first in that thread Ben linked, means you should have it. Or if you're OK with it, keep Jr too. Either way, nice build and it's just a name.
                        Then I misunderstood you in GR. You said (phonetically) 'Me-air-uh'. If you're british, the normal would be 'Myoo-ruh' (Top Gear), but most on this side of the pond say 'Me-er-uh'.

                        I applaud both of you,
                        Wolf
                        "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                        "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
                        "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
                        "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

                        *InDIYana event website*

                        Photobucket pages:
                        https://app.photobucket.com/u/wolf_teeth_speaker

                        My blog/writeups/thoughts here at PE:
                        http://techtalk.parts-express.com/blog.php?u=4102

                        Comment


                        • #13
                          Re: The Miura's - A Dayton CF120 Build

                          Originally posted by Wolf View Post
                          Then I misunderstood you in GR. You said (phonetically) 'Me-air-uh'. If you're british, the normal would be 'Myoo-ruh' (Top Gear), but most on this side of the pond say 'Me-er-uh'.

                          I applaud both of you,
                          Wolf
                          I'm from the midwest, and worse than that, I'm from MI. You should know better that we don't pronounce our words correctly. Milk is melk, caramel is carmel... eh . And then there's pop :eek:
                          "The ability of any system to produce exceptional sound will be limited mainly by the capability of the speakers" Jim Salk
                          "Audio is surely a journey full of revelations as you go" JasonP

                          Comment


                          • #14
                            Re: The Miura Jr's - A Dayton CF120 Build

                            Nope. I helped Matt with this project from day one. It was never called "Miera" and was started long before September. apparently you are "mis-remembering" because Matt gave his presentation on the speakers at Meniscus and explained the name was from the Lambo car with the same name, it was never Miera. Ben you would have a melt down if some one used a name that you had already used for one of your designs. Adding "Jr" is not good enough, the name needs to be changed.
                            craigk

                            " Voicing is often the term used for band aids to cover for initial design/planning errors " - Pallas

                            Comment


                            • #15
                              Re: The Miura Jr's - A Dayton CF120 Build

                              And I though building was the tough part
                              John H

                              Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

                              Comment

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