Announcement

Collapse

2nd Annual Stock-toberfest

2nd Annual Stock-toberfest starts October 17th! Time to stock-up on great products at great prices! Click the Parts Express Logo at the top left of this page.
See more
See less

Cabrini Redux

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Cabrini Redux

    So the Cabrini project I did several years ago proved to be more popular than I imagined it would be, and I have been meaning to get around to doing a follow-up but have not really found the time to do so until very recently.

    Essentially, I targeted as simple a build as possible with these, although they are somewhat more complex than the original Cabrini due to flush mounted drivers. The spirit of getting them done as cheaply as possible while maintaining a minimum of performance remains in this iteration.

    So anyways, on to the squigglies....

    First up is the on-baffle, raw driver measurements:



    I ended up with a four element crossover, which yields the following:



    There you see the Achille's heel of budget drivers - a 1db sensitivity difference between the two woofers. Nothing a deft touch with the balance control can't knock out, though.

    My biggest surprise is the non-linear distortion measurement:



    That is SPL accurate at 1/2M. That is very good for many designs, almost striking on a system using a $11 woofer and $8 tweeter.

    The baffle dimensions:



    Of course, the rest of the dimensions mirror the PE flat pack. Build these into a tower with the tweeter about 33" off the ground, and you will probably be very, very satisfied with them.

    The crossover:



    Sorry PE, you do not carry a 2.2mH 20awg air core coil :( I had to get one from Erse direct. Meniscus will wind one for you, but it will cost you. Substitute the 18awg Jantzen air core if you like, but avoid the P-Core variant.

    All in all, I believe in this design - enough to loan them out to some forum members for their review. Arlis will be picking them up on Monday, and hopefully he can get some listening in before some other members get their mitts on them.

    I am still shaking my head in disbelief at their sound quality. They are not hi-fi, they do not dig deep (~80Hz in this cabinet) and will not blow the roof off - but I have been listening almost non-stop for three days and am still enjoying them.

    Don't listen to me - I have not sold any $150,000 speakers.

  • #2
    Re: Cabrini Redux

    Johnny, not second-guessing you, but was there any worthwhile improvement with a 2nd order and/or Zobel-like shaping circuit on the woofer? I'm pretty sure you simmed those.
    Have you formed a listening impression yet? Just nosey.

    Comment


    • #3
      Re: Cabrini Redux

      I don't do simulations, and my listening impressions are in the post, as far as I review my own work anymore.
      Don't listen to me - I have not sold any $150,000 speakers.

      Comment


      • #4
        Re: Cabrini Redux

        Originally posted by Whitneyville1 View Post
        Johnny, not second-guessing you, but was there any worthwhile improvement with a 2nd order and/or Zobel-like shaping circuit on the woofer? I'm pretty sure you simmed those.
        Have you formed a listening impression yet? Just nosey.
        I'm unsure beating to death with more crossover would help. Everything you add, takes away. Changes phase, impulse, many things. This level of driver....Which is funny because you think they should suck but in fact don't...Its the next level where the dogs are, perhaps because these are "under"dogs? I digress....This level of driver are meant to be used with very simple crossovers. Designed as such. When you start to beat them up with too big of a hammer, they just become flat. Playing in the dirt is fun and there is a lot to be leaned from inexpensive drivers.....Mainly that they can sound damn good.
        .

        Comment


        • #5
          Re: Cabrini Redux

          You don't mention which tweeter or driver you used. I can guess the driver is the grs 6.5 poly but what tweet? thanks.

          Comment


          • #6
            Re: Cabrini Redux

            Originally posted by arrayed View Post
            You don't mention which tweeter or driver you used. I can guess the driver is the grs 6.5 poly but what tweet? thanks.
            Pretty sure it is this high-end ultra precision piece.

            http://www.parts-express.com/grs-1td...8-ohm--292-462
            .

            Comment


            • #7
              Re: Cabrini Redux

              to few parts... not squiggly enough

              good work JR, great budget build. i hope to hear these.
              "As you start traveling down that road of life, remember this: There are never enough comfort stops. The places youíre going to are never on the map. And once you get that map out, you wonít be able to refold it no matter how smart you are." -kermit the frog

              a good place to check out http://www.midwestaudioclub.com/

              Comment


              • #8
                Re: Cabrini Redux

                Another neato build , hope to hear these also in the near future JR. Looks like the tweeter is quasi horn loaded?

                Comment


                • #9
                  Re: Cabrini Redux

                  I haven't used but one pair of GRS drivers. OEM buy-outs may sure act like this: You've got what you bought. Which may not be bad at all. I'll say I've not had great luck with Goldwood's and leave it at that. I have an elderly pair of Radio Snack Nova 6B's (8" woofer 3" cone tweeter 1st order on both) that need a tweeter up-grade from the bargain-bin. The XO freq. on the Nova's is 3KHz supposedly, but the GRS measures like a drop-in fit. The price sure seems right.

                  Comment


                  • #10
                    Re: Cabrini Redux

                    Four pieces? FOUR?!?! You magician, you!

                    Comment


                    • #11
                      Re: Cabrini Redux

                      Yeah, sorry - 6.5" GRS poly and the "high-end ultra precision piece" is that tweeter.

                      Tweeter is not really horn loaded per se, but it is recessed such that flush mounting is probably of only moderate benefit.

                      The only thing I gained with a 2nd order, damped or otherwise, on the woofer was an alarming rise in non-linear distortion through the crossover region. Doesn't need the extra components whatsoever.

                      Better luck in the future figuring out how to use the cheap stuff, Rickey.
                      Don't listen to me - I have not sold any $150,000 speakers.

                      Comment


                      • #12
                        Re: Cabrini Redux

                        Originally posted by martyh View Post
                        Four pieces? FOUR?!?! You magician, you!
                        Abracadabra! Things started to click when I tossed the simulator to the side and started doing it by ear. I do that with all my builds, though, so just got lucky on these drivers.
                        Don't listen to me - I have not sold any $150,000 speakers.

                        Comment


                        • #13
                          Re: Cabrini Redux

                          Originally posted by johnnyrichards View Post
                          Yeah, sorry - 6.5" GRS poly and the "high-end ultra precision piece" is that tweeter.

                          Tweeter is not really horn loaded per se, but it is recessed such that flush mounting is probably of only moderate benefit.

                          The only thing I gained with a 2nd order, damped or otherwise, on the woofer was an alarming rise in non-linear distortion through the crossover region. Doesn't need the extra components whatsoever.

                          Better luck in the future figuring out how to use the cheap stuff, Rickey.
                          Oh, snap. [emoji1]
                          You go your way, I'll go mine. I don't care if we get there on time.

                          ~Pink Floyd

                          Comment


                          • #14
                            Re: Cabrini Redux

                            I ordered the drivers and resistors last night. I will be wrapping my own coil for this build I will be building a Tower to fulfill a certain WAF factor. Do I need to worry about over excursion?

                            Comment


                            • #15
                              Re: Cabrini Redux

                              You could always create a proper sized "box" with a solid horizontal brace... Or maybe JR could cook up a ported version, I don't think many (if any) GRS drivers are good in ported enclosures, the Qts is always super high.

                              रेतुर्न तो थे स्रोत
                              return to the source
                              leviathan system thread
                              deadhorse thread
                              shockwave build thread

                              instagram :: greywarden_13

                              in war, victory . . . in peace, vigilance . . . in death, sacrifice.

                              Comment

                              Working...
                              X