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Flex Your PCD Mettle:

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  • jayhawk785
    replied
    Re: Flex Your PCD Mettle:

    Originally posted by NEO Dan View Post
    Hey Super Steve,
    You want to build using Z's deluxe crossover, but with Brandon's cab style? You have big round over bits?
    I think I have 1.5 and 1.25 inch bits--possibly 1 inch...

    But ya basically the same style, with the listed deluxe xover (since I have the parts already on the way)

    I'll post a picture of the cabinet progress tomorrow -- not that the square boxes are exciting

    Leave a comment:


  • NEO Dan
    replied
    Re: Flex Your PCD Mettle:

    Hey Super Steve,
    You want to build using Z's deluxe crossover, but with Brandon's cab style? You have big round over bits?

    Leave a comment:


  • jayhawk785
    replied
    Re: Flex Your PCD Mettle:

    I've begun building the econowave - deluxes, all speakers/waveguides and crossover parts should be here mon/tuesday.

    I started building the boxes, i made them a bit narrower to fit behind my screen.

    dimensions are 17wx25.5hx10.5d (double baffle - woofer recessed to second piece, and opening rounded over) -- using the kappalite 3012lh, do I need to port the box, or will it be fine stuffed/sealed?

    I've read as much as I can in here and other forums--hoping the boxes will be ok as I've made them. Was a bit worried about depth, but I think they should be deep enough. Is there a necessary amount of clearance needed behind either driver? I think as is i should have 1-2" behind either.

    I appreciate any help guys--I never had a chance to know or speak with Zilch and after reading so many threads with his name in it and all the time he's put into this project, I was saddened to hear of his passing.

    THanks-
    steve

    Leave a comment:


  • Pete Schumacher
    replied
    Re: Flex Your PCD Mettle:HP Power Pro

    Originally posted by srbliss
    Hello Pete,
    What is your final design on the crossover on this setup? I have the drivers and really want to make a pair of 'tribute' E-wave speakers honoring Evan. I have the badges ready to go (I fronted most of the $$ to have them made) He helped me more than a lot on my not so Econo JPL pro (2235H and 2452H-SL on PT-F95HF) speakers and I want to do this project right in honor of him.
    Steve
    If you check the very next post, Zilch commented on why it might not be so good to leave it at that setup, due to the vertical directivity.

    The simplest thing to do would be to mount the woofer recessed so that acoustic centers line up.

    But if I recall correctly, the nice plot was derived using the values in the previous post.

    Woofer: 1.2mH, .2 Ohm ; 22uf shunt ; 1mH, .2 Ohm ; zobel 15uF, 8 Ohm

    Tweeter: 1.5uF ; 1.2mH .2 Ohm ; 10uF in series with 3.3 Ohm to tweeter.

    Leave a comment:


  • gmannel
    replied
    Re: Flex Your PCD Mettle:

    This is a detailed instruction set from 18sound with similar but older drivers - http://www.eighteensound.com/staticC...Sound_kit8.pdf
    Same build and tweak/redo crossover or bi-amp w/ active(miniDSP)?

    Leave a comment:


  • gmannel
    replied
    Re: Flex Your PCD Mettle:

    For an updated E-wave mini?
    http://www.eighteensound.com/index.a...roduct&pid=262, plus either this -
    http://www.parts-express.com/pe/show...number=290-507, this -
    http://www.eighteensound.com/index.a...roduct&pid=256, or this -
    http://www.eighteensound.com/index.a...roduct&pid=243??????
    I have the above CD/WG and since neither that nor any of these 3 woofer choices were avail when the orig was developed, I was wondering if these 'model' well?

    Leave a comment:


  • dtruck
    replied
    Re: Flex Your PCD Mettle:

    Originally posted by gmannel View Post
    And finally, if I model the 2512 using TS parameters, etc, rec.box size is 2.37 cf. Manufac spec sheet says 0.8!! What do I believe? That's a huge difference!
    Attached Files

    Leave a comment:


  • bwaslo
    replied
    Re: Flex Your PCD Mettle:

    Sealed: some built-in protection if they are ever fed with very low frequency energy. Maybe a little easier to integrate with subs, though YMMV. Can stuff the daylights out of the box, to better absorb back wave midfrequencies.

    Vented: less diaphram movement down near where the port contributes, so some more available output there. Less forgiving design if T&S parameters vary. Can't stuff box too much (as it will hurt port efficiency), so gotta be careful to somehow avoid midfrequency reflections back out the cone, or mids leaking out the port.

    Passive: same as vented, except a little more versatile on adjustment (no big tubes inside box, just mess with weight on passive), and better blocking of leaking mids.

    Use WinISD (or similar) and model it with different volumes/tunings. Sometimes the "ideal" box size is way bigger than one that works almost as well but is way smaller.

    If you don't need output below where the sealed box works, I'd go with that. A lot more forgiving of parameters and stuffing.

    Leave a comment:


  • gmannel
    replied
    Re: Flex Your PCD Mettle:

    Got my drivers! BC250, QSC, 2512, and my miniDSP.
    Box will be scratch built. Size is not a consideration as will be behind a screen.
    In general, for an Ewave, what would lead one to choose, or reject:
    1) Sealed
    Smaller size? Any acoustic advantage?
    2) Vented
    Better efficiency? Bass extension?(less important as already have TubaHT)
    3) Passive radiator
    Would this have a detrimental effect on the constant directivity goal?

    And finally, if I model the 2512 using TS parameters, etc, rec.box size is 2.37 cf. Manufac spec sheet says 0.8!! What do I believe? That's a huge difference!

    Leave a comment:


  • Zvuchniak
    replied
    Re: Flex Your PCD Mettle:

    @gmannel

    Note that Edlafontaine and i had the same issues with mids using Deltalite II 2512. There is a solution but i haven't measured fr to se if it is linear enough, yet. That xover is done only by using PCD.

    Please read this stuff:

    http://www.audiokarma.org/forums/sho...ostcount=13885

    Leave a comment:


  • Mayhem13
    replied
    Re: Flex Your PCD Mettle:

    Originally posted by gmannel View Post
    So the lower resonant freq should steer me toward the Deltalite? As I said, price is essen the same, it was just the flatter FR that piqued my interest.
    As to the baffle width, 17 is fine, I was just trying to learn if 17 was chosen for any acoustic reason, or just because the prebuilt box came that way. Since I'm building from scratch it matters not, so if it wasn't detrimental acoustically I thought to model the dimensions of the box to their most ideal config.
    The XO was originally created in that size box so there is a relationship to the final voicing and BSC.

    Generally the lower Fs idicates that the driver will extend lower. My experience with the 2512 has shown it to be true in this case. Good luck with your build!

    Leave a comment:


  • gmannel
    replied
    Re: Flex Your PCD Mettle:

    So the lower resonant freq should steer me toward the Deltalite? As I said, price is essen the same, it was just the flatter FR that piqued my interest.
    As to the baffle width, 17 is fine, I was just trying to learn if 17 was chosen for any acoustic reason, or just because the prebuilt box came that way. Since I'm building from scratch it matters not, so if it wasn't detrimental acoustically I thought to model the dimensions of the box to their most ideal config.

    Leave a comment:


  • Mayhem13
    replied
    Re: Flex Your PCD Mettle:

    Originally posted by gmannel View Post
    Ordering my 12" driver for the Deltalite plan and came across this other Eminence driver - aside from weight is this not a better FR curve? Cost about the same.
    http://www.parts-express.com/pdf/290-593s.pdf
    http://www.parts-express.com/pdf/290-510s.pdf

    And, I am aware that the baffle is 17" wide because that is how the Trap PA comes, but if one is building their own box is there an acoustic reason not to narrow that down to 15 and round over the edges? Sealed box, ~ 2cf.
    Note the resonant freq of the Deltalight.....much lower than the pro and I wouldn't even think about trusting Eminence measurements. If you can find reliable 3rd party measurements of the Delta Pro to compare then they might be worth the effort.

    As to the baffle width, reducing it will alter the original designs baffle step compensation slightly. I doubt you'll hear a difference but I don't understand why you can't maintain the designed width and still maintain the recommended box volume by simply altering the enclosure depth.

    Leave a comment:


  • gmannel
    replied
    Re: Flex Your PCD Mettle:

    Yes, I will be measuring, have a NIB CS calibrated Dayton mic and a NIB Tascam 124MkII 'sound card'( with not a clue yet as what to do w/ them)

    Leave a comment:


  • bwaslo
    replied
    Re: Flex Your PCD Mettle:

    You should be fine with that and the MiniDSP, provided you have a way to measure and see what you're getting. By ear alone you'll never know whether you have the match at the crossover region right. Delay in the MiniDSP helps out on that a lot, adding delay in a passive can be trouble.

    Leave a comment:

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