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Scan-Speek 4" for 49 cents?

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  • Pm180-8 ue

    Originally posted by caleb View Post
    Part Express linked to this thread on their facebook page. Hey maybe they could send jbruner some free drivers so he can improve them with slits and document the work and improvements. I mean something like oh I don't know say a pair of Dayton Audio PM180-8 6-1/2" :D
    CHALLENGE ACCEPTED


    PE never came through with free drivers, so I bought some. I will start a new thread for this one with a full set of measurements. Edit- New thread- How to Train Your PM180-8
    Attached Files
    Last edited by jbruner; 06-03-2015, 11:07 AM.
    "Looks like you may have to design your own speakers. Its not that hard." -DE Focht

    Diffraction Happens

    Comment


    • Re: Pm180-8 ue

      Originally posted by jbruner View Post
      CHALLENGE ACCEPTED


      PE never came through with free drivers, so I bought some. I will start a new thread for this one with a full set of measurements.
      Attachment no worky.
      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

      *InDIYana event website*

      Photobucket pages:
      https://app.photobucket.com/u/wolf_teeth_speaker

      My blog/writeups/thoughts here at PE:
      http://techtalk.parts-express.com/blog.php?u=4102

      Comment


      • Re: Scan-Speek 4" for 49 cents?

        Thanks, Wolf.
        Here's another picture and the on-axis comparison, blue original.

        Click image for larger version

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        "Looks like you may have to design your own speakers. Its not that hard." -DE Focht

        Diffraction Happens

        Comment


        • Re: Scan-Speek 4" for 49 cents?

          Holy deity of your choice, that fixes another crappy Dayton cone, doesn't it? Whoah... Well done.
          Don't listen to me - I have not sold any $150,000 speakers.

          Comment


          • Re: Scan-Speek 4" for 49 cents?

            NICE! Much better,
            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

            *InDIYana event website*

            Photobucket pages:
            https://app.photobucket.com/u/wolf_teeth_speaker

            My blog/writeups/thoughts here at PE:
            http://techtalk.parts-express.com/blog.php?u=4102

            Comment


            • Re: Scan-Speek 4" for 49 cents?

              Very impressed.

              Comment


              • Re: Scan-Speek 4" for 49 cents?

                Originally posted by username00
                Its what's wrong with people in this entire hobby. I'm not a moron, and I learn from simple questions and answers, but never before have a met a larger percentage of douchebags. On DIYaudio its 10 times worse. They discourage you constantly and push this pretentious I'm better than you attitude all over the message board. Most of the people in this hobby seem like they don't want you to learn, or beat around the bush trying to confuse you and then find creative ways to call you a moron. Easily one of the worst groups of people I've dealt with online as far as hobbies go. RC, cars, computers, and any other hobby, the people you are asking for help will actually treat you with a bit of respect.
                Why did you feel the need to sign up and post your one and only post to state your distaste of a generally good tempered group here at PETT? I think Craig was mainly stating reference to: "If you can't say something good, don't say anything at all." The fact that Sidi said what he did helped no one and was rather snide. There is such a thing as constructive criticism, and this was just not that. Being that you've had a bad experience with the group of DIYers is not necessarily our fault here, and I for one would rather help than hinder. If there are Q's you have that you would like answered, please post your query and see what comes of it. Be open to maybe change your ways of thinking, as there is a lot of misinformation and snake oil in this hobby. We are here because we love the music and hobby that makes the music happen. We as a collective aim to allow the newbies to learn and result in a project that is a reflection of what we strive for, without disappointment.

                I welcome you to the forum, enjoy your time here!
                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

                *InDIYana event website*

                Photobucket pages:
                https://app.photobucket.com/u/wolf_teeth_speaker

                My blog/writeups/thoughts here at PE:
                http://techtalk.parts-express.com/blog.php?u=4102

                Comment


                • Re: Scan-Speek 4" for 49 cents?

                  .
                  Last edited by fatmarley; 06-01-2015, 03:12 PM. Reason: going off topic on interesting thread

                  Comment


                  • Re: Scan-Speek 4" for 49 cents?

                    Now those are results worth bragging about.

                    Did it really lose that much sensitivity? 10dB is a lot to lose :(

                    Comment


                    • Re: Scan-Speek 4" for 49 cents?

                      Originally posted by Sidi View Post
                      Now those are results worth bragging about.

                      Did it really lose that much sensitivity? 10dB is a lot to lose :(
                      I had assumed he shifted the response so they would not be overlaid. Yes, if it costs 10db that is a lot.
                      Audio: Media PC -> Sabre ESS 9023 DAC -> Behringer EP2500 -> (insert speakers of the moment)
                      Sites: Jupiter Audioworks - Flicker Stream - Proud Member of Midwest Audio Club

                      Comment


                      • Re: Scan-Speek 4" for 49 cents?

                        Originally posted by Wolf View Post
                        We are here because we love the music and hobby that makes the music happen. We as a collective aim to allow the newbies to learn and result in a project that is a reflection of what we strive for, without disappointment.
                        Hell, you've been putting up with my dumb questions for years.

                        Comment


                        • Re: Scan-Speek 4" for 49 cents?

                          Josh , its hard for me to tell but are damping the surround as well ?

                          and would you care to share your thoughts as to why it is handing the break up so well ?

                          and don't forget i am super noob ....
                          Paper Towers
                          RS180P/28F surrounds
                          Boombox

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                          • Re: Scan-Speek 4" for 49 cents?

                            Originally posted by Sidi View Post
                            Did it really lose that much sensitivity? 10dB is a lot to lose :(


                            I didn't include other ten decibels underneath. My bad and so sorry.
                            "Looks like you may have to design your own speakers. Its not that hard." -DE Focht

                            Diffraction Happens

                            Comment


                            • Re: Scan-Speek 4" for 49 cents?

                              Originally posted by filmslayer View Post
                              Josh , its hard for me to tell but are damping the surround as well ?

                              and would you care to share your thoughts as to why it is handing the break up so well ?

                              and don't forget i am super noob ....

                              The slits don't affect anything in the driver's "pistonic" range where all parts of the cone are moving in the same direction. There is no change at all in the response below 2k. At higher frequencies where the cone goes into "breakup", some parts of the cone are moving in different directions. This is where the slits become active. The compound dampens the relative movement in different parts of the cone.

                              The surround has some damping applied from the factory. There is some room for improvement there, but I have decided to leave it alone.
                              "Looks like you may have to design your own speakers. Its not that hard." -DE Focht

                              Diffraction Happens

                              Comment


                              • Re: Scan-Speek 4" for 49 cents?

                                Originally posted by filmslayer View Post
                                Josh , its hard for me to tell but are damping the surround as well ?

                                and would you care to share your thoughts as to why it is handing the break up so well ?

                                and don't forget i am super noob ....
                                I think it has to do with waves propagating outwards from the centre towards the edge - the slits mean that no wave can directly reach the edge without going through a slit. It means that reflections that may cause standing waves are attenuated due to the cut and the damping glue. It also will dampen radial waves as they can't form a ring without passing through many slits. As stated above the cone probably does move in different directions too, although if the slits are small enough then it shouldn't cause as much smearing due to a floppy cone - I think some of my experiments have too big of a gap... ;)

                                Click image for larger version

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