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Cabrini Redux

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  • Whitneyville1
    replied
    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.

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  • nicholas_23
    replied
    Re: Cabrini Redux

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

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  • Brek81
    replied
    Re: Cabrini Redux

    to few parts... not squiggly enough

    good work JR, great budget build. i hope to hear these.

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  • mzisserson
    replied
    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

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  • arrayed
    replied
    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.

    Leave a comment:


  • mzisserson
    replied
    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.

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  • johnnyrichards
    replied
    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.

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  • Whitneyville1
    replied
    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.

    Leave a comment:


  • johnnyrichards
    started a topic Cabrini Redux

    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.

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