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Pretty Persuasions - InDIY Coax Build Thread

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  • #76
    Why? 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.

    No, I want you to go listen to some of my speakers. You might be pleasantly surprised what can
    be done with filters designed for clean, coherent, natural and accurate reproduction.

    In all seriousness I was offering my personal experience just in case the OP had not compared
    the transfer function between the mini DSP and passive filters, I was actually quite surprised how much
    easier it was to get flatter responses taking advantage of say the transfer function of Butterworth
    alignments, playing with the Q and or minimal shaping circuits. Some of the dark magic that is
    passive XO design that is not possible with Mini DSP (I don't care how much you EQ it, my opinion).
    Because I have been doing it the old fashioned way for so long
    Guess xmax's age.

    My guess: 15. His grammar is passable. His trolling is good.

    Comment


    • #77
      You might be surprised to hear when you come over that I already have a clean coherent natural sound and don't actually need your help.
      I'm not deaf, I'm just not listening!

      Comment


      • #78
        Too bad, I'm going to help you whether you like it or not!
        Guess xmax's age.

        My guess: 15. His grammar is passable. His trolling is good.

        Comment


        • #79
          Originally posted by xmax
          Beautiful! The frame of that mcm woofer looks identical to the Tang Band W8-2096. What drivers are on the waveguide in the other speaker? Any luck with that blown amp?
          --
          Javad Shadzi
          Bay Area, CA

          2-Channel Stereo system in the works with Adcom components and 4-way towers

          Comment


          • #80
            Originally posted by xmax
            On another note, I'm sure you are probably aware of this and I imagine you are not going 48dB slopes in the passive domain. My experience with the mini dsp; the transfer function is nothing like the passive version of the same filter, E.I. a Butterworth filter will have no bump at Fc and more obviously the phase tracking is completely different. I only found it useful for acoustic center alignment and roughing in how low tweeters could go before sounding like screwdrivers in ​your ears and where cone break up could be avoided. Beautiful builds!!!
            --
            Javad Shadzi
            Bay Area, CA

            2-Channel Stereo system in the works with Adcom components and 4-way towers

            Comment


            • #81
              Last edited by JavadS; 01-22-2018, 01:18 PM.
              --
              Javad Shadzi
              Bay Area, CA

              2-Channel Stereo system in the works with Adcom components and 4-way towers

              Comment


              • #82
                ​These are absolutely beautiful cabinets and I love the classic looking wide baffle, I think people are finally getting
                away from the belief the baffle has to be very narrow or "small" for the speakers to have good imaging. I deal
                with wider large baffles with some of my designs and the first comment I always get from people is the imaging
                is like a "movie" or having the "artist in the room with you".


                The curves are looking nice! Sorry I got you mixed up with another cat on the amp comment. I don't mean to offend anyone I have no
                way of knowing everyones level of XO design and I'm trying to be informative for all readers.
                One of the reasons I mentioned the difference with DSP and passive, it seems to be kind of a lost art,
                but when modeling crossovers there is a lot of different classic "ratios" with just
                second order like Bessel, Butterworth, Linkwitz Riley. I try to take advantage of this aspect whenever
                possible. (people seem to really hate talking about anything textbook on this forum) I noticed when trying to mimic this
                with DSP it gets it completely wrong. Somebody will say something about pure resistive loads or some other crap,
                these observations were made with ribbon tweeters or drivers with some sort of impedance compensation.
                Regardless of what others think I do believe there are advantages to keeping cap and coil ratios within
                classical ratios to a certain extent to prevent "ringing" and other nasty artifacts. If nothing else it's
                a hell of a starting point. If you don't believe me just do some calculations with say Zaph or
                troelsgravesen.dk designs you will start to see they are more than not "textbook" especially
                in the high-pass section. I don't think it is all coincidence...
                Guess xmax's age.

                My guess: 15. His grammar is passable. His trolling is good.

                Comment


                • #83
                  Originally posted by xmax View Post
                  I'm sure you heard a song in the last 24 hours my filters were involved with.
                  Ah, you must be the one who mixed my SNFU and Dead Kennedys albums . Please do us all a favour and turn down the compressors so our hifi systems can actually reproduce the dynamic range that they are capable of.

                  Sorry Javad, I'll stop invading your lovely speaker thread now.
                  I'm not deaf, I'm just not listening!

                  Comment


                  • #84
                    The closest thing I worked on to Dead Kennedys would be Erase Errata, but I'm no longer a recording/mix/mastering engineer.
                    What you (and I) have a problem with is digital limiting, not compression.
                    Guess xmax's age.

                    My guess: 15. His grammar is passable. His trolling is good.

                    Comment


                    • #85
                      Limiter is just a different compressor, but yes we are in agreement here. Anyway, turn the gain knob down a bit so the recording can contain some dynamic range. Don't worry, I have a gain knob of my own to turn it back up on my end ;)
                      I'm not deaf, I'm just not listening!

                      Comment


                      • #86
                        Nice! Javad,

                        One question;

                        Do you use amplifiers that are stable down to such a low impedance ( ie 2 ohms ) ?



                        Last edited by EarlK; 01-24-2018, 10:23 AM.

                        Comment


                        • #87
                          Originally posted by EarlK View Post
                          Nice! Javad, One question; Do you use amplifiers that are stable down to such a low impedance ( ie 2 ohms ) ?
                          --
                          Javad Shadzi
                          Bay Area, CA

                          2-Channel Stereo system in the works with Adcom components and 4-way towers

                          Comment


                          • #88
                            Originally posted by JavadS View Post
                            ......bringing response and phase inline transformed the sound of the horn from honky and bright to smooth and balanced.
                            Hey Javad... This question may border on the subjective, but can you help describe "honky" a bit more in this context? I've heard of horn honk before, but never really been able to associate that with a sound. It just makes me think of an old cartoon bicycle horn or something.

                            Thanks!
                            Keith
                            Voxel Down Firing with Dayton SA70
                            Translam Subwoofers - The Jedi Mind Tricks
                            The Super Bees - Garage 2 way
                            SevenSixTwo - InDIYana 2018 Coax
                            The Defiants - InDIYana 2019 "Bare Minimum" Build

                            Comment


                            • #89
                              You're not far off. It adds that honky coloration or 'forced' sound into the lower female register for sure. When I dialed the resistor value down recently on Steve's "Jaws" in the horn's LCR, it was clear that the honk had subsided using Jennifer Warnes.

                              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

                              *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


                              • #90
                                Originally posted by KEtheredge87
                                Hey Javad... This question may border on the subjective, but can you help describe "honky" a bit more in this context? I've heard of horn honk before, but never really been able to associate that with a sound. It just makes me think of an old cartoon bicycle horn or something. Thanks! Keith
                                --
                                Javad Shadzi
                                Bay Area, CA

                                2-Channel Stereo system in the works with Adcom components and 4-way towers

                                Comment

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