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It's Alive! DIYDC

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  • It's Alive! DIYDC

    After a couple of missed years, I'm reviving the DIY gathering in Washington, D.C. (well, Bethesda, MD). It will be a modest affair with no competition--just a show and tell and a very interesting demonstration of crossover slopes by Neil Davis. I'll let him describe exactly what he's planning. I'll have the recently introduced Salk HT4's on hand, which feature an 18 Hz bass module by Jeff Bagby, a quasi open-back mid module using the $500 per FAL flat driver, and a virtually free standing RAAL OEM ribbon tweet. And my passive variant on the Linkwitz Pluto will also make an appearance, using an upfiring
    5" revelator midwoof and the Neo 3 planar.

    This won't be anything to rival the Iowa or Ohio DIY's, but maybe the food will be better. The date? July 18th, 10:00 AM. The place? 5214 Wehawken Rd, Bethesda MD 20816. Please PM me, Dennis Murphy, if you can attend or have any questions.

  • #2
    Re: It's Alive! DIYDC

    ALL-FREAKIN'-RIGHT!!!!!!!!

    I'm there!
    If dynamite was dangerous, do you think they'd sell it to an idiot like me?

    Comment


    • #3
      Re: It's Alive! DIYDC

      Hmmm, I would love to be there but I bet that the odds of that happening are about zero.

      Have a good time Dennis and you never know I just might make it. I have some family in the area.

      Doug
      http://dpeterson.home.mchsi.com/

      I just checked and my "give a damn" is broke :D

      Comment


      • #4
        Re: It's Alive! DIYDC

        Hey Doug,

        When Dennis was at the Iowa event did you take him to Casa Margarita? No? I didn't think so....

        Let's not be dissin' Iowa food! :p

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        • #5
          Re: It's Alive! DIYDC

          Ah C'monnnn. I hope there's more interest than this. Maybe people are just sending PMs and not posting.

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          • #6
            Re: It's Alive! DIYDC

            Originally posted by ericy View Post
            Ah C'monnnn. I hope there's more interest than this. Maybe people are just sending PMs and not posting.
            The replies are trickling in. But there's room for lots more. Did I mention that I have a remote-controlled A-B preamp that lets you instantly compare up to 4 sets of speakers at the same volume level? And there will be food? And a golden retriever?

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            • #7
              Re: It's Alive! DIYDC

              For a preview, here is one of my very limited edition Plutoesque octagons, with Dennis' crossover.

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              • #8
                Re: It's Alive! DIYDC

                I'd like to exhibit these at DCDIY.

                This speaker was built in 2005 and two of the drivers I think are now discontinued so that the speakers are basically not replicable. Despite their one of a kind limitation , I think that they are worth a listen and perhaps a critique as well.


                Dennis Murphy designed the crossover and he hasn't heard them in stereo yet so I thought that after all his efforts he should at least hear the results of his work.
                The bass is the venerable Peerless CSX 10", mid a Seas Excel w15CY and the tweeter is the Raven R1 ribbon.

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                • #9
                  Re: It's Alive! DIYDC

                  Originally posted by cfbuck View Post
                  I'd like to exhibit these at DCDIY.

                  This speaker was built in 2005 and two of the drivers I think are now discontinued so that the speakers are basically not replicable. Despite their one of a kind limitation , I think that they are worth a listen and perhaps a critique as well.


                  Dennis Murphy designed the crossover and he hasn't heard them in stereo yet so I thought that after all his efforts he should at least hear the results of his work.
                  The bass is the venerable Peerless CSX 10", mid a Seas Excel w15CY and the tweeter is the Raven R1 ribbon.

                  Thanks very much for the post, and I hope you'll be able to make the long trek. I'll look forward to hearing that design again--it's the only one I've done with the Raven, which is an exceptionally smooth driver. Although the Peerless woofer is extinct, I've revised my MB0W1 3-way using the replacement woofer, which is almost as good. So I'm sure this design could be modified successfully as well.

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                  • #10
                    Raal vs ?

                    What do you think of the Raal oem?
                    .
                    http://www.raalribbon.com/products.htm

                    Comment


                    • #11
                      Re: It's Alive! DIYDC

                      Originally posted by mtbiker View Post
                      For a preview, here is one of my very limited edition Plutoesque octagons, with Dennis' crossover.

                      Nice! What is the approximate cost in drivers and crossovers?

                      Jason

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                      • #12
                        Re: It's Alive! DIYDC

                        Probably $700+ for drivers and crossovers...

                        The monetary cost isn't the real story. It's the time required to make an absurd cabinet like this. Of course there are a few things I would do differently if I had to do this all over again.

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                        • #13
                          Re: It's Alive! DIYDC

                          Dennis or mtbiker....

                          Any comments on listening impressions, on it's own or as compared to the original Pluto?

                          Thanks,

                          Jason
                          Last edited by jasonb; 06-13-2009, 04:20 AM. Reason: My typing sucks!

                          Comment


                          • #14
                            Re: Raal vs ?

                            Originally posted by sendler View Post
                            What do you think of the Raal oem?
                            .
                            http://www.raalribbon.com/products.htm
                            That's easy--it's virtually perfect, although the last sample I got wasn't quite as flat, and I suspect the tensioning of the ribbon element is critical and subject to QC issues. But the response without a baffle (which is how I use it) is the best I've seen, both on and off axis. And the distortion products in the 1500-3000 Hz range are much lower than with other ribbons I've measured. I crossed it at 1800 Hz on the new Salk speaker with no problems. On very well recorded material with lots of bells and whistles, the sonic superiority is readily apparent in an A-B test with the best ribbons and domes. When money's not an object, it would definitely be my tweet of choice.

                            Comment


                            • #15
                              Re: It's Alive! DIYDC

                              Originally posted by jasonb View Post
                              Dennis or mtbiker....

                              Any comments on listening impressions, on it's own or as compared to the original Pluto?

                              Thanks,

                              Jason
                              I haven't had extended experience with the new Pluto, but I had the original version in my house for almost a year. The Orion is one of my favorite speakers, but the 1st Pluto--not so much. The lower treble and upper midrange sounded blurred to me, particularly on brass. There was just too much output. That didn't show up on the usual one-meter measurement, however. And when I first designed the crossover for Mt. Biker I went for a flat measured response. But it sounded just like the Pluto. My read is that the very short measuring window wasn't picking up on the woofer's rear radiation output. But, of course, the ear would as soon as the 1st reflections came rolling in. I took some room measurements and experimented with the on-axis profile in the crossover region, and finally came up with something that sounded accurate to me (but it measured with a pretty deep depression centered around 2 kHz). Jamie can update me on this, but when he got the thing home, he tried it in two different rooms, one quite reverberant, and the other very damped. It sounded fine in the reverberant room, but he could pick up on the hole in the middle in the dry room. So these things are tricky.
                              Last edited by framus; 06-14-2009, 10:37 AM.

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