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My RS180 MTM Design

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  • #16
    Re: My RS180 MTM Design

    They look great in the pictures and on paper.
    Thanks ,
    JB

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    • #17
      Re: My RS180 MTM Design

      Just a wee bit simpler crossover than the NatP or Marsh's elliptical / 4th order. It's a beautiful thing when a simpler approach is good enough and works.

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      • #18
        Re: My RS180 MTM Design

        Originally posted by Jeff B. View Post
        The port tuning is at 40Hz. I do not know where it is being crossed over at to the sub, that is being done by the studio tech.

        Jeff What are the dimensions of the port used.......Thanks

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        • #19
          Re: My RS180 MTM Design

          Well..dang.. Now I MUST build these! soon as I finish my Nano NTN's and Zaph BAMTM..this stuff is like crack for the ears..Highly addictive! Thanks again Jeff for a beatiful design both externally and electronically..
          Thanks,
          Chris

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          • #20
            Re: My RS180 MTM Design

            Originally posted by robertclark View Post
            I may do that one day. Right now I have the "Seas flavored" version (27TDFC/G) with some Pete Shumacker designed crossovers in them.
            Post the XO I sent you. I'd like to see how close the woofer XOs are to each other. They're both real simple.
            R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
            Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51

            95% of Climate Models Agree: The Observations Must be Wrong
            "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

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            • #21
              Re: My RS180 MTM Design

              It's a 1 cubic foot box tuned to 40 Hz. Any box program will give you the set of dimensions that will achieve 40 Hz.

              Originally posted by upsman View Post
              Jeff What are the dimensions of the port used.......Thanks
              I was so much older then, I'm younger than that now.
              OS MTMs http://techtalk.parts-express.com/sh...d.php?t=220388
              Swope TM http://techtalk.parts-express.com/sh...d.php?t=221818
              Econowave and Audio Nirvana AN10 fullrange http://techtalk.parts-express.com/sh...d.php?t=216841
              Imperial Russian Stouts http://techtalk.parts-express.com/sh...=1#post1840444
              LECBOS. http://techtalk.parts-express.com/sh...ghlight=lecbos

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              • #22
                Re: My RS180 MTM Design

                I intended to post this chart too, but forgot. Here are the transfer functions for the crossover for those that are interested in this.



                There was more interest in this design than I anticipated. Thanks, guys.

                Jeff
                Click here for Jeff Bagby's Loudspeaker Design Software

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                • #23
                  Re: My RS180 MTM Design

                  Originally posted by fastbike1 View Post
                  It's a 1 cubic foot box tuned to 40 Hz. Any box program will give you the set of dimensions that will achieve 40 Hz.
                  That would be my suggestion. I would have to call the studio to have someone tell me exactly what diameter and length they are, as I do not remember exactly.
                  Click here for Jeff Bagby's Loudspeaker Design Software

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                  • #24
                    Re: My RS180 MTM Design

                    You are being way too modest. There are several designers here whose designs offer much to learn. You are definitely one of them. ;)

                    Originally posted by Jeff B. View Post
                    I intended to post this chart too, but forgot. Here are the transfer functions for the crossover for those that are interested in this.



                    There was more interest in this design than I anticipated. Thanks, guys.

                    Jeff
                    I was so much older then, I'm younger than that now.
                    OS MTMs http://techtalk.parts-express.com/sh...d.php?t=220388
                    Swope TM http://techtalk.parts-express.com/sh...d.php?t=221818
                    Econowave and Audio Nirvana AN10 fullrange http://techtalk.parts-express.com/sh...d.php?t=216841
                    Imperial Russian Stouts http://techtalk.parts-express.com/sh...=1#post1840444
                    LECBOS. http://techtalk.parts-express.com/sh...ghlight=lecbos

                    Comment


                    • #25
                      Re: My RS180 MTM Design

                      Post the XO I sent you. I'd like to see how close the woofer XOs are to each other. They're both real simple.
                      Here you go....................



                      Comment


                      • #26
                        Re: My RS180 MTM Design

                        Originally posted by robertclark View Post
                        Here you go....................



                        [ATTACH]15112[/ATTACH]
                        I wonder if Pete's has a lower crossover point with the larger 33uF cap.?

                        Comment


                        • #27
                          Re: My RS180 MTM Design

                          Originally posted by foxfire3 View Post
                          I wonder if Pete's has a lower crossover point with the larger 33uF cap.?
                          Probably just a touch, more like 1500 if I can remember correctly. It's been a long time since I modeled that up.

                          What I find refreshing is that my XO attempt is so close to Jeff's. I just went with the cheap option by subbing a small cap and resistor for the small inductor to make the tank.

                          :p
                          R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
                          Byzantium Project & Build Thread || MiniByzy Build Thread || 3 x Peerless 850439 HDS 3-way || 8" 2-way - RS28A/B&C8BG51

                          95% of Climate Models Agree: The Observations Must be Wrong
                          "Gravitational systems are the ashes of prior electrical systems.". - Hannes Alfven, Nobel Laureate, Plasma physicist.

                          Comment


                          • #28
                            Re: My RS180 MTM Design

                            I'll bring these down to DoubleTap's in May so you can hear them.

                            Comment


                            • #29
                              Re: My RS180 MTM Design

                              Jeff
                              I am working on a new HT setup, I have built a HIVI SP-10 sub to start it off and love it. I was considering the USHER project on PE for my L/R/C speakers but you have really posted a gem of a project here. Of course you can predict my next question, what changes would be needed to lay one of these down for a center channel?
                              Out of the question due to the MTM vertical/horizontal issue?
                              Many thanks for a beautiful project.
                              Steve in Maui

                              Comment


                              • #30
                                Re: My RS180 MTM Design

                                Originally posted by endless View Post
                                Jeff
                                I am working on a new HT setup, I have built a HIVI SP-10 sub to start it off and love it. I was considering the USHER project on PE for my L/R/C speakers but you have really posted a gem of a project here. Of course you can predict my next question, what changes would be needed to lay one of these down for a center channel?
                                Out of the question due to the MTM vertical/horizontal issue?
                                Many thanks for a beautiful project.
                                Steve in Maui
                                Due to the fairly low crossover point, if it were directly in front of the listening area it wouldn't be too bad placed horizontally. I am not certain without really digging into it what the angle of the listening window would be though.

                                However, can your home theather amp handle a group of speakers that all drop below 4 ohms?
                                Click here for Jeff Bagby's Loudspeaker Design Software

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