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Nice curves... - Scan-Speak 15M/4624G

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  • Nice curves... - Scan-Speak 15M/4624G

    I decided to measure a driver I'd had sitting on my shelf for a while...

    Scan-Speak 15M/4624G



    here's the FR taken from about 1 foot with a inductor + cap low pass filter.



    You don't often see such smooth curves as that without notch filters!
    Last edited by critofur; 11-15-2010, 10:56 AM.
    "...this is not a subwoofer" - Jeff Bagby ;)

  • #2
    Re: Nice curves... - Scan-Speak 15M/4624G

    Originally posted by critofur View Post

    You don't often see such smooth curves as that without notch filters!
    Gotta love those ScanSpeak cones and suspensions!!!

    The red curve is the 15W4831 (OEM 4531) on-baffle, sans XO. smooooooth
    Yellow is the RS28A on baffle sans XO.

    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


    • #3
      Re: Nice curves... - Scan-Speak 15M/4624G

      If that isn't a drool worthy driver, I don't know what is. All that for only $62 each, this is one of the best looking midrange divers I've seen. This one and the 10F as well. This 15M claims to be 2.5dB more sensitive than the 10F though, which can be very advantageous for anyone wanting a real "loud"-speaker.
      "I just use off the shelf textbook filters designed for a resistor of 8 ohms with
      exactly a Fc 3K for both drivers, anybody can do it." -Xmax

      Comment


      • #4
        Re: Nice curves... - Scan-Speak 15M/4624G

        Everybody else saw: "foam surround" and decided to pass, I saw "foam surround" and I thought to myself: "ah, this driver is going to be good...".

        Ha ha Pete, mine's flatter and only cost 1/3 as much :D Mind you, I would like to try some of those Scan-Speak slit paper cone drivers someday...

        I cut out below 200Hz because the floor bounce cancellation was naaaasty. I should try measuring from an extension off my 2nd floor outdoor porch maybe. The inductor corrects for a slight rising high end, but no "BSC" in the traditional sense. That measurement is taken with the driver on my enclosure, not on a test baffle ;)
        "...this is not a subwoofer" - Jeff Bagby ;)

        Comment


        • #5
          Re: Nice curves... - Scan-Speak 15M/4624G

          I've got no problem with foam surround as long as it withstands the test of time. Visual appearance is another thing of course. This driver, even with the foam surround looks pretty damn sexy. I haven't seen it in person, but it looks like they've color matched the foam to the cone pretty good.
          "I just use off the shelf textbook filters designed for a resistor of 8 ohms with
          exactly a Fc 3K for both drivers, anybody can do it." -Xmax

          Comment


          • #6
            Re: Nice curves... - Scan-Speak 15M/4624G

            Originally posted by critofur View Post
            Ha ha Pete, mine's flatter ...
            You think? Check scale . . . mine's on a 5dB/div, yours is on 10dB . . . ;)

            Originally posted by critofur View Post
            That measurement is taken with the driver on my enclosure, not on a test baffle ;)
            Same here, on the Byzantium baffle.

            You can be sure that I'll be using those Discovery mids in a future endeavor. :D
            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
              Re: Nice curves... - Scan-Speak 15M/4624G

              Originally posted by dcibel View Post
              I've got no problem with foam surround as long as it withstands the test of time. Visual appearance is another thing of course. This driver, even with the foam surround looks pretty damn sexy. I haven't seen it in person, but it looks like they've color matched the foam to the cone pretty good.
              Nice, beefy frame too.

              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


              • #8
                Re: Nice curves... - Scan-Speak 15M/4624G

                You think? Check scale . . . mine's on a 5dB/div, yours is on 10dB . . . ;)
                Flatter, yes, smoother, perhaps not. Now, with two crossover components, you might match the flatness, but will you have a design that doesn't need BSC?
                "...this is not a subwoofer" - Jeff Bagby ;)

                Comment


                • #9
                  Re: Nice curves... - Scan-Speak 15M/4624G

                  Originally posted by critofur View Post
                  Flatter, yes, smoother, perhaps not. Now, with two crossover components, you might match the flatness, but will you have a design that doesn't need BSC?
                  Yes!!! Just use a real woofer to fix the baffle step problem!!!

                  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: Nice curves... - Scan-Speak 15M/4624G

                    Thans for sharing... I've had my eye on that one for a future project.

                    Comment


                    • #11
                      Re: Nice curves... - Scan-Speak 15M/4624G

                      Hi,

                      This no follow up of this driver because no one that I know of have use this driver in their design. I am thinking of using it instead of the Discovery 10F which I understand is being used by a few designer incl. John K. This driver(4624G,92.4dB) has better sensitivity compared to the 10F(89dB).

                      Is there anyone out there who can contribute their knowledge on this driver confirming what Critofur had obtained?

                      Thanks in advance.

                      Comment


                      • #12
                        Re: Nice curves... - Scan-Speak 15M/4624G

                        Originally posted by critofur View Post
                        Everybody else saw: "foam surround" and decided to pass, I saw "foam surround" and I thought to myself: "ah, this driver is going to be good...".
                        Nothing wrong with foam. I noticed the foam surround when they first came out. That's a big part of the smooth response, I'm sure. The 21W/8554 used it, I've got a pair purchased used. They still look new. As a treated foam, they should last, from what I've read, maybe 30 years. Yet there are frequently those who post that they won't use a driver with foam because of a preconceived notion of it being inferior.

                        SS has been making drivers with foam that last 20-30 years for a very long time.

                        dlr
                        WinPCD - Windows .NET Passive Crossover Designer

                        Dave's Speaker Pages

                        Comment


                        • #13
                          Re: Nice curves... - Scan-Speak 15M/4624G

                          Hmmm. Nice woofer. Would like to see some distortion measurements.

                          Comment


                          • #14
                            Re: Nice curves... - Scan-Speak 15M/4624G

                            Originally posted by sunandmoon View Post
                            Hmmm. Nice woofer. Would like to see some distortion measurements.
                            Here's the 10F from Zaph's blog. I've no doubt the 15M would be similar, if not better. This is superbly clean midrange performance.

                            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


                            • #15
                              Re: Nice curves... - Scan-Speak 15M/4624G

                              Here's the 10F from Zaph's blog. I've no doubt the 15M would be similar, if not better. This is superbly clean midrange performance.

                              I would bet the HD would fall somewhere in between that and the HD of the 18W8434 seen below since the 10F has a copper cap and this one only has an aluminum shorting ring. Now that is still a great place to be for a midrange under $100, much less the $55 this one goes for.



                              Chris
                              Chris

                              Goofing around since 2000.

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