Announcement

Collapse
No announcement yet.

RS-P WWMTM 3 Way underway ( pic heavy )

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

  • #46
    Re: RS-P WWMTM 3 Way underway ( pic heavy )

    Originally posted by jcandy View Post
    While the approach to designing a speaker with flat anechoic response is fairly standard, the approach to designing one that includes the woofer-floor interaction is less standard. Perhaps Jeff B. could explain what his preferred method is.
    I still take the gated response on the tweeter axis, which in a room is a bit messy. I also do some modeling. If someone follows my link below and has Excel they can download and use my Diffraction and Boundary Simulator. For the boundary portion I would use the power response and very little, if any, room pressurization. Then look at the combined response with the baffle diffraction simulation included for a reasonable approximation of the low end power response. For a one meter on axis simulation switch the boundary graph to "axial" and then look at the combined graph. It's not perfect, but it helps.
    Click here for Jeff Bagby's Loudspeaker Design Software

    Comment


    • #47
      Re: RS-P WWMTM 3 Way underway ( pic heavy )

      all measurements from 2 foot ,same amplitude on tweet axis ...

      top 125



      bottom 125



      tweet

      Last edited by filmslayer; 07-31-2017, 08:52 PM.
      Paper Towers
      RS180P/28F surrounds
      Boombox

      Comment


      • #48
        Re: RS-P WWMTM 3 Way underway ( pic heavy )

        Hey, everything looks a lot better when it's flush-mounted!

        I think something is causing some top octave loss in the measurements.

        Maybe someone who has measured one can confirm, but I believe the Reference silk tweeter has a rising response.
        "Looks like you may have to design your own speakers. Its not that hard." -DE Focht

        Diffraction Happens

        Comment


        • #49
          Re: RS-P WWMTM 3 Way underway ( pic heavy )

          Filmslayer.... I know that everyone has there own way of doing things, but what I would do is first make sure that your speaker measurement setup is adequate, and then I'd use gated measurements. Then, I'd take a few measurements of the mids together using a speculated highpass filter. In other words something like 80 uf and 3 mH, and just see what the response looks like. Make a few adjustments, and then add a lowpass to the filter. Something like .6 mH, and 8 uf. If nothing else, you will get some practice, and probably learn a few things as well.

          Comment


          • #50
            Re: RS-P WWMTM 3 Way underway ( pic heavy )

            think i my may have blown up a tweet . i was searching for that top octave this morning and turned the amp up just a bit and ran a sweep , i heard nothing wrong during the sweep but i get no sound out of it now ... gonna finish my coffee before i pull it out and switch it . <sigh>
            Paper Towers
            RS180P/28F surrounds
            Boombox

            Comment


            • #51
              Re: RS-P WWMTM 3 Way underway ( pic heavy )

              switched tweets , other one is ok . putting the suspected bad one back in now ...

              **EDIT**

              yep , its toast ...
              Paper Towers
              RS180P/28F surrounds
              Boombox

              Comment


              • #52
                Re: RS-P WWMTM 3 Way underway ( pic heavy )

                You can just buy new v.c. assemblies for those, I think at about 1/2 the price?

                Comment


                • #53
                  Re: RS-P WWMTM 3 Way underway ( pic heavy )

                  Maybe a NPE cap to put in line to save the tweeter, I think it is 100uf for 4 ohms and 50uf for 8 ohms.
                  If we all reacted the same way, we'd be predictable, and there's always more than one way to view a situation.
                  What's true for the group is also true for the individual. It's simple: Overspecialize, and you breed in weakness.
                  It's slow death.

                  //Burn n' Die//Dream Weaver//Maximus//ABC Bookshelf Speakers//Dayton Twin Towers

                  Comment


                  • #54
                    Re: RS-P WWMTM 3 Way underway ( pic heavy )

                    the pro's and con's of testing un-protected were discussed i made the decision , no big deal , chalk it up to a lesson learned . i'll get a new diaphragm when i order XO parts ...

                    tried to get more measuring done . took a look between the lower mid and upper woofer , i need to make some changes in Holm to get a better picture . would really like to get some XO parts ordered this week ...
                    Paper Towers
                    RS180P/28F surrounds
                    Boombox

                    Comment


                    • #55
                      Re: RS-P WWMTM 3 Way underway ( pic heavy )

                      i'm still trying to get good measurements and just found what may be a problem . my sound card has a microphone boost that was turned up to +24db . will go back and re-measure tonight and see how much of a difference it makes ...

                      i really can't wait to hear this .
                      Paper Towers
                      RS180P/28F surrounds
                      Boombox

                      Comment


                      • #56
                        Re: RS-P WWMTM 3 Way underway ( pic heavy )

                        Did you by chance miss the HOLM starter guide? Perhaps you can post a picture of your speaker while set up for making measurements.

                        Comment


                        • #57
                          Re: RS-P WWMTM 3 Way underway ( pic heavy )

                          not missed (http://techtalk.parts-express.com/sh...-starter-guide) , and thank you !!! its what got me to this point along with their instruction pdf ... i'd rather not post pics of my place , y'all would die of laughter , true story .... Jbruner is privy to my set up and working with me every night as he is the one designing my XO ...
                          Paper Towers
                          RS180P/28F surrounds
                          Boombox

                          Comment


                          • #58
                            Re: RS-P WWMTM 3 Way underway ( pic heavy )

                            Great looking build!

                            I've contemplated a similar design for years, but side-firing the woofers to get a little thinner baffle for improved WAF. If that ever happens (LOL) the RS125P/28F combo would be right at the top of my list. I await your conclusions!

                            Comment


                            • #59
                              Re: RS-P WWMTM 3 Way underway ( pic heavy )

                              thankfully i have no WAF .... i have a dog and until she dusts once in a while she has no say !!! :p
                              Paper Towers
                              RS180P/28F surrounds
                              Boombox

                              Comment


                              • #60
                                Re: RS-P WWMTM 3 Way underway ( pic heavy )

                                OK , i got all the measurements i was asked for zipped up and sent to Josh .

                                my original thought with these being towers was to use out riggers and spikes for a couple of reason . first the tipping factor and second to get the tweeter up a couple more inches . but after putting one together both those are no longer concerns , it is big and stable and the tweet is rite at ear level as it is . i guess my question is , is there any other audible advantages to spikes that i need to consider ?
                                Paper Towers
                                RS180P/28F surrounds
                                Boombox

                                Comment

                                Working...
                                X