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Rs180P/RS28F vs. small DC160 3 way

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  • #31
    John , there wasn't really any change within the circuit with the resistor going before or after the first cap .my question was more of why is the consumption happening so far ahead of where the circuit actually working ?
    Paper Towers
    RS180P/28F surrounds
    Boombox

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    • #32
      and FWIW John , thank you for starting my day with a chuckle ... i chuckled out loud at " Mr. Slayer " ....
      Paper Towers
      RS180P/28F surrounds
      Boombox

      Comment


      • #33
        Originally posted by jhollander View Post
        BTW right click on the amp in XSim, tune, and adjust the wattage to something like 30 watts, then look at you components.

        .
        well that do make a difference ! but the two circuits are still the same ... 1st pic is with resistor after the cap ...

        posting now is painfully slow !!!
        Paper Towers
        RS180P/28F surrounds
        Boombox

        Comment


        • #34
          OK the watts dissipated graph is showing S1, you need to show R1.

          Here's are few graphs of Neis x-o. It's interesting how the resistance changed but not as expected. I think this is due to the driver impedance and the x-o...

          John H

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

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          • #35
            That's not what I'm referring to, John. I'm saying the wattage dissipation should be exactly the same if you flip the capacitor and pre-series resistor's positions. This means both will be before the shunt coil.

            What I'm getting at, is that the HP limits power going through the series resistor, from whichever position it is in, even when placed before the first series cap, to where the rolloff of the filter will not allow the resistor to have to pass much power. Even out in front, my resistors do not get hotter than when placed after, and this is due to the highpass and how the AC circuit works.

            For example, I have a 9.1 ohm 10W resistor in front of a 3rd order filter, consisting of a 20uF/0.95mH/6.8uF, and it's never gotten warm, even when pushing the LED's to about -15dB on the level indicator.

            Frankly, I really don't think the power meter is a good indication of what really happens with music.

            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

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            • #36
              i'm not sure about all this and got to think Ben is right . here are a few different pics . like i have it before X , then after in an L-pad and also the FR and Z when its in the L-pad .
              Paper Towers
              RS180P/28F surrounds
              Boombox

              Comment


              • #37
                Yes I agree with the resistor on either side of the cap is the same watts dissipated. My original note was a warning that pre- x-o vs. post x-o resistors can consume large amounts of power. While it doesn't appear to be the case here it was a fun discussion. I will continue to check watts dissipated to see if I need to bump up the power rating of my resistors.
                John H

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

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                • #38
                  i agree John , good discussion and i learned something .
                  Paper Towers
                  RS180P/28F surrounds
                  Boombox

                  Comment


                  • #39
                    if i didn't know better i'd say the Speaker Gods are conspiring against this build !!! first the 160"s are outta stock , then it was just hot to go out and work and now with the 160's back and the brutal heat backed off a bit i get really excited to get these box's together this weekend only to wake up yesterday to a monsoon ! we're to get 15-19 inches of rain between saturday and tuesday .... so i'm stuck inside . figure i'd put an ext, port in my surrounds pull them out in the middle of the room and get some measurements . i can find nothing that fits inside that 3" cutout ... i have 3" core tubes that my window film comes on but they are the exact same same size and just won't fit .

                    how important to my measurements is the port gonna be ? i've already designed the XO for the 2 way in small sealed cab but measurements were taken using the floor as a boundary as they are designed to go on wall , i was just wanting to get them out in the middle of the room with no boundary effects ....
                    Paper Towers
                    RS180P/28F surrounds
                    Boombox

                    Comment


                    • #40
                      parts are ordered and as Jbunner has told me there is nothing left but a little git-r-done !!! i have made some considerations , been following this thread http://techtalk.parts-express.com/fo...iver-important and gonna do an A-B the a stack of 10uF poly buyouts and a 68uF npe ... for me being a noob its about learning , so i'll measure and listen and report back .
                      Paper Towers
                      RS180P/28F surrounds
                      Boombox

                      Comment


                      • #41
                        took Johns advice and went for 3/4" stuff , loosing an inch did throw my box dimensions outta whack . working on new cut sheet now ,hoping to have box's together tomorrow and the 2way baffle cut Sunday ...
                        Paper Towers
                        RS180P/28F surrounds
                        Boombox

                        Comment


                        • #42
                          Question : do i run into any issues staggering the divers like this ?
                          Paper Towers
                          RS180P/28F surrounds
                          Boombox

                          Comment


                          • #43
                            John H

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

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                            • #44
                              what exactly you mean rotated 90 degrees ?

                              yes , terminal cup filling for DS90 ... the 90 is overall 3.64" , the terminal cup 4 , so i'll have a little there .... i'm gonna have to increase the height to 16.5 , no biggie just makes it a lil taller ... left/right is no problem , all my builds are that way , wasn't really the plan for these but i can still center the 2 way ...
                              Paper Towers
                              RS180P/28F surrounds
                              Boombox

                              Comment


                              • #45
                                i see what you mean about 90 , yes i am standing on the side ... though this would work with no changes ....
                                Paper Towers
                                RS180P/28F surrounds
                                Boombox

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