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The PEDS - a 2.1 speaker system for your desk, den, bedroom or office

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  • #46
    Originally posted by BOBinGA View Post
    Re: The PEDS - a 2.1 speaker system for your desk, den, bedroom or office

    Sorry about that. It is confusing. No, there is no separate LP filter on the sub now. I did the XO diagram based on my initial tests where I used a LP filter on the sub and ran everything from one amp. Once I added the plate amp, I eliminated the LP filter on the sub. The sub is wired directly to the plate amp and uses its built in LP filter. The satellites are run separately from the speaker terminals on the plate amp as you would expect. Its hard to read in the picture, but I drew a box around the LP filter for the sub and put in a note saying that is was not needed when the amp was used. So disregard the LP filter on the sub section.

    A quick note on the plate amp. From what I could tell, the bass boost circuit is actually a 6db boost at 40hz. The spec say 3db at 63hz. The actual filter does boost 63hz by 3db, but is also boosts 40hz by 6db, so the spec are, I guess, correct, but a bit misleading. You can model the woofer in WinISD using the "peaking 2nd order high pass" using 6db at 40hz and it matches the measured response exactly. You can also turn off the bass boost and measure and, sure enough, the output in the low 40hz range is indeed 6db lower than with the boost enabled. Also, the specs on the plate amp say it has a built in HP filter set to 150hz. But from what I can tell, it looks more like an 80hz HP. I haven't looked closely at that part yet, but if so, this is good.

    -Bob
    Hi Bob, nice work! After reading that the high pass is at 80 hz I want to buy this amp but only if it's 80 to 100 hz highpass because I don't want my sub play higher than 80 hz

    greetings

    Comment


    • #47
      Sorry bob, after reading a little furder I found the result of the test. I want to buy this amp and use it with the W6-1139SIF and maybe the dayton nd-105.

      Comment


      • #48
        The ND105s should work well with that amp and it's crossover. I considered their little brother ND90 for my build, but in the end, the DS90 was a better fit for the tiny Denovo cabinets. The ND105s will require a slightly larger box, but that's easy enough to do.
        -Bob
        -Bob

        The PEDS 2.1 mini system
        My A7 Project - another small desktop speaker
        The B3 Hybrid Dipole - thread incomplete and outdated

        Comment


        • #49
          Hi Bob, the nd-105 don't like a enclosure under 2 liter( as you say).Lets say the nd-91 do it a bit better and a little bit smaller.

          the nd-105 in 2 liter(green) and the nd-91 in 1.5 liter(red)
          ​​​​​​
          I have a little bump at 100 hz to compensate the cross over roll of that is build in de dayton amp. If I use the nd-91 I really like to built the heliums.

          also is the dayton amp a bit " user friendly " , so easy to work with. Like over protection if I set it to loud.

          thanks

          Comment


          • #50
            I cannot say how it handles over driving. I have never driven it to shutdown. I have only played it comfortably loud.
            -Bob
            -Bob

            The PEDS 2.1 mini system
            My A7 Project - another small desktop speaker
            The B3 Hybrid Dipole - thread incomplete and outdated

            Comment


            • #51
              Hi Bob,
              Would you be able to post the build of your mtm center channel you use with the peds. Thanks for the help.

              Myles

              Comment


              • #52
                Sorry, but I never posted it. I will try to get to it sometime this week.
                -Bob

                The PEDS 2.1 mini system
                My A7 Project - another small desktop speaker
                The B3 Hybrid Dipole - thread incomplete and outdated

                Comment


                • #53
                  So, my next project is a gift to a young family friend, an adaptation of this system. Pink "Hello Kitty" theme. Hey, I just make them.

                  The satellites will be stock, the sub will be a 9" cube passive. The power will be a Nobsound bluetooth 2.1 chip amp. I have two of the old Dayton MCA 2.1 plate amps, but they aren't sold anymore, giving someone a custom gift with an old obsolete used amp seemed tacky. Besides, I used the MCA amp for years in my 2.1 PC system, I think a desktop location for the controls beats reaching down to adjust. And, I would need a bluetooth receiver add on.

                  All 12 edges of all three boxes will be radiused for a soft feminine look. Should please our new friend tvrgeek.

                  Probably little stands to lean the satellites back a bit and lift them off the desk. Pink sub or no? Further consultation to decide.

                  I'll do a build thread.

                  Comment


                  • jd12
                    jd12 commented
                    Editing a comment
                    all 12.. LOL

                • #54
                  People are just sick.

                  Click image for larger version

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                  • #55
                    Huh? What did I miss? Is there a deleted post in there?
                    -Bob

                    The PEDS 2.1 mini system
                    My A7 Project - another small desktop speaker
                    The B3 Hybrid Dipole - thread incomplete and outdated

                    Comment


                    • #56
                      I just ordered the parts yesterday. It will be a while before I start.

                      I found some odd "Hello Kitty" stickers on the web.

                      Comment


                      • #57
                        The bass boost in the MCA amp was how I was able to use the TB subwoofer in a closed box. If you switch amps, you will need +6 at 40 hz (45 will also work) if you want the same response.
                        -Bob

                        The PEDS 2.1 mini system
                        My A7 Project - another small desktop speaker
                        The B3 Hybrid Dipole - thread incomplete and outdated

                        Comment


                        • #58
                          The bass boost in the MCA amp was how I was able to use the TB subwoofer in a closed box. If you switch amps, you will need +6db at 40 hz (45 will also work) if you want the same response.

                          I am looking forward to your build thread. Pink will be different for sure.
                          -Bob

                          The PEDS 2.1 mini system
                          My A7 Project - another small desktop speaker
                          The B3 Hybrid Dipole - thread incomplete and outdated

                          Comment


                          • #59
                            I did read the info on the boost. I may go with a bigger vented box.

                            Comment


                            • #60
                              In keeping with the theme of using pre cut Denovo boxes, you could use the 0.67 cu. ft. box 300-7068 and a 2" PVC vent that is 14" long. (An elbow will be needed). This tunes it to just over 30 Hz. The Yung 100 watt amp with no boost would work great since it has a built in 25 Hz high pass filter to protect the woofer a bit and provide all the power the woofer is built for.
                              -Bob

                              The PEDS 2.1 mini system
                              My A7 Project - another small desktop speaker
                              The B3 Hybrid Dipole - thread incomplete and outdated

                              Comment

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