Announcement

Collapse
No announcement yet.

RS22528A

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • RS22528A

    Provided Link: http://206.13.113.199/ncdiyaudio/mark/index.htm


    Part 1 is here.
    audioheuristics isn't around right now...

  • #2
    Hey Mark, A quick question


    How critical is your driver spacing? I can imagine the answer might be that it's very critical but I'm wondering if they can be placed closer to one another. I'm contemplating a few options for my RS225 project, one being a two way TL design. With the gracious guidance of Paul K I think this might be the way I will go but it all hinges on the performance of the new RS midrange if I go 2 way or 3 way. If that unit is as good as the rest of the RS lineup, I'm all set. If not, 2-way here I come but I would want the drivers to be a bit closer if for nothing else than aesthetic reasons. Thanks.

    shawn
    My favorite woofer is a Labrador retriever.

    Comment


    • #3
      Re: Hey Mark, A quick question


      Well, no reason the drivers can't be closer. But because of the low crossover, there is some leeway on the CTC spacing. Plus, the axis tilt from the tweeter horizontal offset is a bit less. All in all, I don't think it would matter.

      Of course any changes to the layout/baffle would require a different set of xover values.

      audioheuristics isn't around right now...

      Comment


      • #4
        Re: Hey Mark, A quick question


        Shawn, I'll let Mark answer you regarding his crossover design, but keep in mind that Mark used a PE cabinet whose width, I believe, is less than the cabinet design I worked up. You'll have to make my cabinet design narrower and deeper to accommodate Mark's crossover and, at the same time, keep the cabinet volume as I designed.
        Paul K.

        > How critical is your driver spacing? I can
        > imagine the answer might be that it's very
        > critical but I'm wondering if they can be
        > placed closer to one another. I'm
        > contemplating a few options for my RS225
        > project, one being a two way TL design. With
        > the gracious guidance of Paul K I think this
        > might be the way I will go but it all hinges
        > on the performance of the new RS midrange if
        > I go 2 way or 3 way. If that unit is as good
        > as the rest of the RS lineup, I'm all set.
        > If not, 2-way here I come but I would want
        > the drivers to be a bit closer if for
        > nothing else than aesthetic reasons. Thanks.

        > shawn

        Comment


        • #5
          Re: Hey Mark, A quick question *PIC*




          > How critical is your driver spacing? I can
          > imagine the answer might be that it's very
          > critical but I'm wondering if they can be
          > placed closer to one another. I'm
          > contemplating a few options for my RS225
          > project, one being a two way TL design. With
          > the gracious guidance of Paul K I think this
          > might be the way I will go but it all hinges
          > on the performance of the new RS midrange if
          > I go 2 way or 3 way. If that unit is as good
          > as the rest of the RS lineup, I'm all set.
          > If not, 2-way here I come but I would want
          > the drivers to be a bit closer if for
          > nothing else than aesthetic reasons. Thanks.

          > shawn

          Shawn,

          I've got a ML-TQWT design using those very drivers that Roman Bednarek and I worked out . . . if you're interested.


          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


          • #6
            Re: Hey Mark, A quick question


            > Shawn,

            > I've got a ML-TQWT design using those very
            > drivers that Roman Bednarek and I worked out
            > . . . if you're interested.

            Also have one with the SEAS 27TBFC instead of the RS28
            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


            • #7
              Thanks for all the info gents!


              First off to Mark. I understand completely the baffle width considerations. I was going to use your crossover as my starting point and tweak for the different baffle width. I like what I see in your plots enough to think it's a great place to start.

              Paul, I figured you would jump in on this thread too ;). I appreciate all of your input and development of the TL design. I'm going to do it for sure but it probably won't be until spring when I finally start cutting the wood. That is unless everything else I have on the to-do list suddenly evaporates. Winter time is usually my time to work on my house and it's really in dire need of the attention this time around. I will be picking up some of the RS mids very soon. I'm anxious to see how well they perform.

              And Pete, thanks a ton for the offer. I like the lines of what you and Roman have come up with. I am always interested in different projects that I've not tried before and I've been wanting to try my hand at a TQWT. I was leaning towards trying a pair like what is on the project showcase but this is a great option for sure. Any further info you care to share would be greatly appreciated.

              Once again, thanks guys. This is the very reason I love this forum. Great advice and great people. Have a good one.

              shawn
              My favorite woofer is a Labrador retriever.

              Comment


              • #8
                Re: Hey Mark, A quick question


                That's a great-looking design, Pete, but my space is too limited to handle such a tall cabinet, and even if it wasn't, I know my wife would say NO!
                Paul K.

                > I've got a ML-TQWT design using those very
                > drivers that Roman Bednarek and I worked out
                > . . . if you're interested.

                Comment


                • #9
                  Re: Hey Mark, A quick question


                  > That's a great-looking design, Pete, but my
                  > space is too limited to handle such a tall
                  > cabinet, and even if it wasn't, I know my
                  > wife would say NO!
                  > Paul K.

                  The cabinet can be folded over to make a design only 3' tall in a more conventional style. The main point was just to display the TL shape, length, and port tuning.
                  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


                  • #10
                    Re: Thanks for all the info gents!


                    > First off to Mark. I understand completely
                    > the baffle width considerations. I was going
                    > to use your crossover as my starting point
                    > and tweak for the different baffle width. I
                    > like what I see in your plots enough to
                    > think it's a great place to start.

                    > Paul, I figured you would jump in on this
                    > thread too ;). I appreciate all of your
                    > input and development of the TL design. I'm
                    > going to do it for sure but it probably
                    > won't be until spring when I finally start
                    > cutting the wood. That is unless everything
                    > else I have on the to-do list suddenly
                    > evaporates. Winter time is usually my time
                    > to work on my house and it's really in dire
                    > need of the attention this time around. I
                    > will be picking up some of the RS mids very
                    > soon. I'm anxious to see how well they
                    > perform.

                    > And Pete, thanks a ton for the offer. I like
                    > the lines of what you and Roman have come up
                    > with. I am always interested in different
                    > projects that I've not tried before and I've
                    > been wanting to try my hand at a TQWT. I was
                    > leaning towards trying a pair like what is
                    > on the project showcase but this is a great
                    > option for sure. Any further info you care
                    > to share would be greatly appreciated.

                    > Once again, thanks guys. This is the very
                    > reason I love this forum. Great advice and
                    > great people. Have a good one.

                    > shawn

                    The XO is of similar topology, very steep slopes around the 1.5KHz mark. The cabs can be "folded" above the tweeter to create a more conventional style design instead of the large triangular presentation.

                    But now that the RS mid is out, I may want to revamp the design to incorporate them in the 600Hz range. As nice as the RS225 is, I'm just not sure of using it that high up.

                    I'm anxious to get Mark's listening impressions. The system sure looks like it measures well. I can't help thinking it will sound very nice to moderate listening levels, but I just worry about them at crescendo.

                    Let me know if you need more detail.
                    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


                    • #11
                      Lots o measurments!


                      Great work dude. I've played with the 225 using Darren's measurements and seems like it could go up to around 1500 Hz with a C-e crossover. But no real need if the RS28 holds together lower.

                      Too bad the PE box isn't a bit wider...wonder what a RS270 two-way would be like at 1200Hz except there's that mode at around 1KHz. Maybe crossed lower with something like a Neo8...

                      Dave


                      Comment


                      • #12
                        Curt's Speaker Design Works

                        "It is the mark of an educated mind to be able to entertain a thought without accepting it."
                        - Aristotle

                        Comment


                        • #13

                          Comment


                          • #14
                            Re: Nicely done, Mark!

                            can someone help me get the x- over design to this build?

                            Comment


                            • #15
                              Re: Nicely done, Mark!

                              Originally posted by curt_c View Post
                              60 liters tuned to 24 Hz would provide an f3 of roughly 30 Hz, and nearly the same power handling above 20 Hz as compared to a sealed design with a Qtc of .7.
                              So this is possible with the same crossover?

                              Comment

                              Working...
                              X