Polk Audio SDA SRS 1.2TL Crossover Modification Thread

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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    Ohhhh yeah!
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • DarqueKnight
    DarqueKnight Posts: 6,642
    edited May 2013
    Are you going to connect the ends of the two side panels to cut down on vibration?
    "So hot it burns Mice!"~DK
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
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  • nooshinjohn
    nooshinjohn Posts: 23,212
    edited May 2013
    Have you calculated how much internal volume this XO is going to take up inside the box? There is only 6.77 cubic feet inside the SRS and these monsters look like they will take up at least a foot of that.


    Looks great Trey. I do volunteer to do a field test for you.:mrgreen:
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    I think there is a lot of confusion on how this is built -

    The shelf is mounted to the crossover plate. The shelf itself is all one piece of aluminum and the sides are welded to the bottom shelf. The aluminum itself is air craft grade aluminum, extremely dead material as is.

    Once the delrin substrate it mounted to it via the nylon washers, all I can manage to make the aluminum do is "thud"... it is extremely dead. I am actually impressed just how dead it is.

    As far as strength, you could literally stand on the welded portion and with the Delrin mounted on to it - you can not even flex the sides.

    Thanks guys! :)
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • Toolfan66
    Toolfan66 Posts: 14,981
    edited May 2013
    DarqueKnight wrote: »
    Are you going to connect the ends of the two side panels to cut down on vibration?
    nooshinjohn wrote: »
    Have you calculated how much internal volume this XO is going to take up inside the box? There is only 6.77 cubic feet inside the SRS and these monsters look like they will take up at least a foot of that.


    Looks great Trey. I do volunteer to do a field test for you.:mrgreen:
    VR3 wrote: »
    I think there is a lot of confusion on how this is built -

    The shelf is mounted to the crossover plate. The shelf itself is all one piece of aluminum and the sides are welded to the bottom shelf. The aluminum itself is air craft grade aluminum, extremely dead material as is.

    Once the delrin substrate it mounted to it via the nylon washers, all I can manage to make the aluminum do is "thud"... it is extremely dead. I am actually impressed just how dead it is.

    As far as strength, you could literally stand on the welded portion and with the Delrin mounted on to it - you can not even flex the sides.

    Thanks guys! :)

    I think it looks fantastic, and I can tell its a solid piece. I am more concerned with it affecting airflow to the passives..
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  • drumminman
    drumminman Posts: 3,396
    edited May 2013
    Toolfan66 wrote: »
    I think it looks fantastic, and I can tell its a solid piece. I am more concerned with it affecting airflow to the passives..

    I don't think airflow is a concern. My understanding is that the backwave pressure created by the MW's is what drives the passives, and this would only be affected by diminishing the internal volume of the cabinets. I doubt these Xovers would have that much effect on the volume. Disclaimer: this is all IMHO.

    BTW, Nice work Trey!
    "Science is suppose to explain observations not dismiss them as impossible" - Norm on AA; 2.3TL's w/sonicaps/mills/jantzen inductors, Gimpod's boards, Lg Solen SDA inductors, RD-0198's, MW's dynamatted, Armaflex speaker gaskets, H-nuts, brass spikes, Cardas CCGR BP's, upgraded IC Cable, Black Hole Damping Sheet strips, interior of cabinets sealed with Loctite Power Grab, AI-1 interface with 1000VA A-L transformer
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    Thanks guys!

    air flow should not be an issue... There will be approximately 2" or more on each side of space, approximately 1.5" or more along the back plus all of the open space in the center.

    Plus air will pass through the spaces between the components as well...

    I actually spent a good hour drawing out different shelf ideas and this one made the most sense.

    interestingly enough this has enough room to mount all MR caps if you relocate the large inductor....
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • Systems
    Systems Posts: 14,872
    edited May 2013
    attachment.php?attachmentid=84655&stc=1&d=1367198805

    I would not add any electrical insulation to those IMHO (blue heatshrink).
    May not make alot of difference being that short, but will make a difference.
    I would never add an unneeded dielectric.

    JMHO, and YMMV.

    Beautiful work BTW!
    As usual Trey, beautimus work!:cheesygrin:
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    Lol... Come on Paul... That's like 1.5" of heat shrink.....

    Thanks man!
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • Systems
    Systems Posts: 14,872
    edited May 2013
    Cotton maybe, but personally I would never use polyolefin.
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  • Systems
    Systems Posts: 14,872
    edited May 2013
    Its not a bad idea at all (1.5" x 2 = 3" EACH though).

    I would use teflon or cotton.

    What I like about your work Trey is you show pictures for all your work, and different speaker types.
    For some reason most people that do your type of work, are either scared or shy away from showing their work.
    Transparency in your work says alot.
    Personally, I would have someone who shows their work do mine as opposed to someone who never shows any pics of their work.
    Not to mention, it is excellent quality work..........Ole school like you don't see much anymore.

    For sure!:cheesygrin:
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  • Systems
    Systems Posts: 14,872
    edited May 2013
    attachment.php?attachmentid=84655&stc=1&d=1367198805


    That is some beautiful work my friend.........and I know how hard that is too do!:lol:
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    Thanks Paul! :) Mucho appreciated!

    In approximately 2 months I will be showing off a super large project that makes this one look extremely small... :-P
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • Inspector 24
    Inspector 24 Posts: 1,308
    edited May 2013
    So why no heat shrink?
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  • Systems
    Systems Posts: 14,872
    edited May 2013
    VR3 wrote: »
    Thanks Paul! :) Mucho appreciated!

    In approximately 2 months I will be showing off a super large project that makes this one look extremely small... :-P

    I bet you say that to all the ladies!:redface::redface::cheesygrin::lol:
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    13 awg internal wiring!
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    Tweeter network cable
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    Internal Wiring
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • Toolfan66
    Toolfan66 Posts: 14,981
    edited May 2013
    What wire are you using in the crossovers??
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    Supra Rondo, I like it because it sounds great and is ultra flexible
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    Molex connectors
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    Gold Disconnects
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • Toolfan66
    Toolfan66 Posts: 14,981
    edited May 2013
    How are you mounting the Molex blocks to the crossover? I'm going to use them as well, but I'm thinking of maching slots for them to sit in..
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    I am going to route out a slot for them to fit into, will be a tight fit for sure! :)
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    Gimpod Mods still rocking and rolling! :-D
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    That's a whole lotta wire! :)
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • Toolfan66
    Toolfan66 Posts: 14,981
    edited May 2013
    That looks so awesome!!! Can't wait to do mine!!
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    Thank you sir! :)

    I hope to finish up my big 1.2TL mod here by the end of the week! :)
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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  • Drenis
    Drenis Posts: 2,871
    edited May 2013
    Is that a small blue SA cap in the last picture? I thought MR's were big so I assume it's not a MR cap?

    That is nutters... Can't imagine how mine will populate.

    Edit: Can I also ask why you reverse polarity on the plates? As in, positive on the left and negative on the right when looking at the plates from the binding post side.
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  • VR3
    VR3 Posts: 25,109
    edited May 2013
    The blue cap is MR, very small value.

    Most speakers in the industry are right side positive.
    - Not Tom

    "No, that's silly talk. Dude, you can't possibly be this audio dumb so quit the act." - Doro
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