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The Defiants - InDIYana 2019 Build

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  • KEtheredge87
    started a topic The Defiants - InDIYana 2019 Build

    The Defiants - InDIYana 2019 Build

    Hey Everyone,

    Its about time I started a build log for my InDIYana entry this year, since I'm a good 1/3 of the way into building the cabinets. This year's theme is "Bare Minimum" referring to the number of XO components that we are limited to use (5 components in this case). I have decided to try a combo of an RS180P-4 woofer in a vented cabinet with a waveguide mounted RST28F-4 tweeter. Those drivers have held my interest and kept me from venturing off into the SB Acoustics territory just yet. I think the RS paper woofers look great, I've always wanted to do a build with them, and the extended smooth frequency response of those woofers ought to make my life a little easier on the XO as well. The waveguide I'm using is the Visaton WG148R, which fits the RST28 dome nicely once you remove the protective grill. I decided to make my own mounting cup to mate those two together, although I think civit has some DIY 3D printed adapters for this combo as well.

    I'm a sucker for a bit of cabinet complexity, so I'm revisiting the curved sides AND top design aesthetic from my Jedi Mind Trick subwoofers. Rather than go full translam, this time I'm using tomzarbo's method of curved cabinets by laminating 1/8" HDF layers on to the cabinet subframe. In order to curve the top too, I added some internal MDF layers to the ceiling to allow at least 3/4" of thickness throughout the full path of the curve. Oh... and just to push the envelope one level further, I'm also doing a chamfered front baffle! Someone on Facebook predicted this year was "the year of the chamfered baffle"... which is partly goofy since they never really went out of style... but I'm happy to contribute nonetheless.

    I'll attach some screenshots and BassBox models to show the general concept, but here's the rundown

    The Defiants - InDIYana 2019 - Cabinet Specs
    Outside Dimensions (containing box): 18" tall x 9" wide x 15" deep
    Internal Volume, Vb = 0.642 ft^3
    Predicted Box Tuning, Fb = 41.4 Hz
    Predicted F3 = 42 Hz
    Modeled Vent = 2" ID x 6" length (flush, no flare)
    Materials: 3/4" MDF subframe, 6 layers x 1/8" HDF laminated walls
    Front Baffle Thickness: 1.5" external + 3/4" subframe = 2 1/4" "total baffle thickness" << Needed to do this for the chamfered baffle look

    Last but not least for now... credit where credit is due... I totally got the Noico 80 idea from JavadS 's "Rivalries" facebook thread. In general I don't really want to spy on other entries, but I generally recognize a good idea when I see one. Thanks bud!

    Click image for larger version

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  • KEtheredge87
    replied
    Originally posted by a4eaudio View Post

    Keith, did you end up changing the crossover for MWAF from the 5-part InDIYana version?
    Yessir. I added a 1.5 ohm resistor in parallel with the woofer's, following the capacitor.
    Click image for larger version

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  • Wolf
    replied
    ...to 6 parts he said at MWAF.
    Wolf

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  • a4eaudio
    replied
    Originally posted by KEtheredge87 View Post
    So what's next from here? I will be doing some vertical off-axis measurements to accompany the horizontal off-axis measurements that I detail in the report. I will also be doing some A-B testing with an additional 1.5ohm resistor after the 20uF capacitor in the LF circuit to control the woofer knee. I tend to like relaxed midranges, and the current 5 part XO measures much more flat than relaxed. I don't find the current XO objectionable at all with 5 parts... I just think it might be that much better with a 6th component. Time will tell.
    Keith, did you end up changing the crossover for MWAF from the 5-part InDIYana version?

    Leave a comment:


  • 4thtry
    replied
    Originally posted by KEtheredge87 View Post
    As-expected, the PETT forum software won't allow me to post my full write-up directly because the filesize is over 2MB. Instead, I have a google drive link where you all can view my writeup by clicking below. You'll have to trust that I'm not going to rick-roll you ;)

    The Defiants - InDIYana 2019 Bare Minimum Competition - Final Writeup

    So what's next from here? I will be doing some vertical off-axis measurements to accompany the horizontal off-axis measurements that I detail in the report. I will also be doing some A-B testing with an additional 1.5ohm resistor after the 20uF capacitor in the LF circuit to control the woofer knee. I tend to like relaxed midranges, and the current 5 part XO measures much more flat than relaxed. I don't find the current XO objectionable at all with 5 parts... I just think it might be that much better with a 6th component. Time will tell.

    Otherwise, these bad boys will be going to Midwest Audio Fest in July! I hope to see you guys there!

    Thank you so much for following along with my build and learning with me. The interactions are what make the build logs all worth it.

    - Keith
    Wow. Cool 36 page pdf write up. Good looking horizontal polars, CSD and toneburst plots. Very detailed. Must have taken a long time to put this all together! Good job!

    So, looks like we are all getting ready for a re-match in Springboro! I will be in the <$200 category as well.

    Leave a comment:


  • wogg
    replied
    Originally posted by KEtheredge87 View Post
    Wogg... I can't quite decide what category I should enter into. I handily fall into the under $200 category with only $87 in drivers ($100 if you count the waveguide). The All-Dayton category could in theory have someone showing up with a giant WMTMW with 8's and 10's and whatnot, which would be an odd comparison to a 2-way bookshelf design. I know it's about sound quality... but I tend to think people listen to music with their eyes more than their ears sometimes.
    I just figured out that I have a family reunion that weekend. I'd ditch them for MWAF but this part of the family only gets together every 5 years-ish. Kinda disappointed...

    Leave a comment:


  • KEtheredge87
    replied
    Originally posted by PWR RYD View Post
    Cool looking speakers Keith!
    Thanks Craig! It was a blast putting these together!

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  • PWR RYD
    replied
    Cool looking speakers Keith!

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  • Wolf
    replied
    I'll be in the <$200 with the both of you with my Zingers...
    Wolf

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  • KEtheredge87
    replied
    Originally posted by wogg View Post
    Are you going for the under $200 or all Dayton category Keith? Mine will be back in the under $200.

    I think it will come down to personal preference and the audition tracks... that goes for all of the expected repeats I heard over the weekend. They're all damn good!
    Wogg... I can't quite decide what category I should enter into. I handily fall into the under $200 category with only $87 in drivers ($100 if you count the waveguide). The All-Dayton category could in theory have someone showing up with a giant WMTMW with 8's and 10's and whatnot, which would be an odd comparison to a 2-way bookshelf design. I know it's about sound quality... but I tend to think people listen to music with their eyes more than their ears sometimes.

    Leave a comment:


  • wogg
    replied
    Are you going for the under $200 or all Dayton category Keith? Mine will be back in the under $200.

    I think it will come down to personal preference and the audition tracks... that goes for all of the expected repeats I heard over the weekend. They're all damn good!

    Leave a comment:


  • jhollander
    replied
    Keith, nice write up on the Tolex and write up in general. Not likely you are going to be in the same category as Nick at MWAF unless Nick changes the woofer?

    Leave a comment:


  • KEtheredge87
    replied
    Originally posted by scottvalentin View Post
    DID NOT SEE THE BLUE SNAKESKIN COMING!
    Nice job Keith and hope to hear how you made out in the competition. Those look amazing and unique, and obviously a meticulously designed project.
    Thanks Scott! I actually got knocked out in the first round by ugly woofer and his very well designed honeycombs! He used the aluminum dome RST28 tweeter to great effect. I think I took 14 votes to his 24 votes! At the end of the day I was still smiling as I heard my speakers in the room, so I consider that a win. I'm looking forward to a rematch at MWAF

    Leave a comment:


  • scottvalentin
    replied
    DID NOT SEE THE BLUE SNAKESKIN COMING!
    Nice job Keith and hope to hear how you made out in the competition. Those look amazing and unique, and obviously a meticulously designed project.

    Leave a comment:


  • OldBeginner
    replied
    I would say you did not go overboard at all! These kinds of threads are fascinating and watching you work through this process is both entertaining and informative. i don't know if I will ever try to design anything of my own, but seeing others work through the process is a big part of what makes this forum a place I come back to.

    Also - those look really really good. My hat is off to your woodwork.

    Leave a comment:

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