SDA SRS Crossover parts list

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  • Astrl55
    Astrl55 Posts: 62
    edited January 18
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    gregmoyers wrote: »
    ... Tricky to cut and drill.

    Any chance you could elaborate on technique, process, lessons-learned ?

    I just acquired (2) circular pieces of acrylic to be used as 2nd tier risers on my Model 5s.
  • joebass3
    joebass3 Posts: 270
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    Astrl55 wrote: »
    gregmoyers wrote: »
    ... Tricky to cut and drill.

    Any chance you could elaborate on technique, process, lessons-learned ?

    I just acquired (2) circular pieces of acrylic to be used as 2nd tier risers on my Model 5s.

    Not to hijack this thread, but this is what I used as risers on a set of Monitor 10's I did. Pretty straightforward. Link below...

    WLIANG 25 Pcs 4 Inch Unfinished Round Disc Cutouts, 1/9 Inch Blank Round Wood Circles for DIY Crafts, Painting, Staining, Coasters Making, Home Decorations https://a.co/d/0ns9q2o

    ubpzp1vmjemh.jpg

  • VR3
    VR3 Posts: 28,310
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    The problem with acrylic is it has a tendency to shear off. Imagine drilling a hole and your whole project breaks in half, that's acrylic.

    I usually drill thru acrylic with small pilot holes and then use my appropriate bit I need going backwards, basically burning my way thru. My laser printer goes thru it like butter.

    Lexan is a much better material if you are manually cutting and drilling as it doesn't shear and break like acrylic but it also cost substantially more. Delrin is also a fantastic material but also very expensive compared to acrylic.
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
  • F1nut
    F1nut Posts: 50,086
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    FR4 is my choice. Cuts on a table saw, wet tile saw or band saw and drills very well. The only downside is you don't want to breath the fibreglass dust, so wear a respirator.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."


    President of Club Polk

  • VR3
    VR3 Posts: 28,310
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    I've used that before, definitely not laser friendly and as you said definitrly wear a respirator!
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
  • gregmoyers
    gregmoyers Posts: 140
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    I had to test several drill bits to find ones that would not grab and crack the hole. Bits that have less of a pitch worked well. Do practice holes. I used a Milwaukee skill saw with a steel cutting blade and it cut perfect edges.
    It helped enormously being able to se through to the main board while soldering component leads. Be careful with the size so it will fit back in the cabinet when assembled. Mine barely squeezes in.
    And make sure you don’t solder the 130uf caps to C3🫤. Glad I caught that!
  • gregmoyers
    gregmoyers Posts: 140
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    All came out good and sounds really good.
    Fun project!
  • stubby2
    stubby2 Posts: 40
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    Did you use O-rings or the like between the lower standoffs and the printed side of the circuit board?
    Polk SDA SRS 2A
    Aragon 8008X3
    Aragon Soundstage
    Multiple Digital Sources
  • stubby2
    stubby2 Posts: 40
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    Lol, I think I meant the bottom side of the circuit board.
    Polk SDA SRS 2A
    Aragon 8008X3
    Aragon Soundstage
    Multiple Digital Sources
  • gregmoyers
    gregmoyers Posts: 140
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    No I put the ends of the standoff’s on a sanding wheel to bring it to rounded end taking the hex off so they would seat better without effect from irregularities on that side of the board.
  • stubby2
    stubby2 Posts: 40
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    Gotcha. I just ordered some aluminum standoffs that are totally tubular with no hex.
    I was going to use O-rings as insulators between standoffs and circuit board.
    Polk SDA SRS 2A
    Aragon 8008X3
    Aragon Soundstage
    Multiple Digital Sources
  • Astrl55
    Astrl55 Posts: 62
    edited January 19
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    stubby2 wrote: »
    I was going to use O-rings as insulators between standoffs and circuit board.
    that is a job for fibre washers
  • gregmoyers
    gregmoyers Posts: 140
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    I wouldn’t use aluminum.
  • stubby2
    stubby2 Posts: 40
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    What is your standoff material of choice?
    Polk SDA SRS 2A
    Aragon 8008X3
    Aragon Soundstage
    Multiple Digital Sources
  • F1nut
    F1nut Posts: 50,086
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    Nylon
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."


    President of Club Polk

  • gregmoyers
    gregmoyers Posts: 140
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    Yes nylon. With nylon screws and nuts. Whole kit on Amazon. Plenty strong if you also use L bracket on each end. Are you still gonna use the 16mH coil? Hopefully you’ve already put a Jantzen C coil in the cabinet.
  • stubby2
    stubby2 Posts: 40
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    Nylon it is. I ordered the kit you spoke of. Thanks to everyone for showing the way!
    I need to look at the Jantzen c coil, looks to be popular and the Aragon amp can handle the load.
    Polk SDA SRS 2A
    Aragon 8008X3
    Aragon Soundstage
    Multiple Digital Sources
  • pitdogg2
    pitdogg2 Posts: 24,927
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    stubby2 wrote: »
    Nylon it is. I ordered the kit you spoke of. Thanks to everyone for showing the way!
    I need to look at the Jantzen c coil, looks to be popular and the Aragon amp can handle the load.

    Hifi collective will have the best price on the C-coil.
    Which Aragon amp?
  • stubby2
    stubby2 Posts: 40
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    Thanks for the heads up about HiFi Co!

    The Aragon is the 8008X3. It and the 8008X5 are common ground.
    Polk SDA SRS 2A
    Aragon 8008X3
    Aragon Soundstage
    Multiple Digital Sources
  • Schurkey
    Schurkey Posts: 2,100
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    stubby2 wrote: »
    The Aragon is the 8008X3. It and the 8008X5 are common ground.
    I have an Acurus 200X3, it's common ground. My 2-channel Aragon amps have 20 ohms of resistance between the negative terminals--10 ohms each to the chassis ground. Makes my SDAs unlistenable.

  • gregmoyers
    gregmoyers Posts: 140
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    C coil is a noticeable improvement in low end. Worthwhile for sure.vefukx409vph.jpeg
    v36yng0zdoqv.jpeg
    efau8emlwugz.jpeg
  • pitdogg2
    pitdogg2 Posts: 24,927
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    stubby2 wrote: »
    Thanks for the heads up about HiFi Co!

    The Aragon is the 8008X3. It and the 8008X5 are common ground.

    Very nice! I use a Aragon 8008bb, I must use a dreadnought with my 2.3tl's.
  • Schurkey
    Schurkey Posts: 2,100
    edited January 21
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    Schurkey wrote: »
    stubby2 wrote: »
    The Aragon is the 8008X3. It and the 8008X5 are common ground.
    I have an Acurus 200X3, it's common ground. My 2-channel Aragon amps have 20 ohms of resistance between the negative terminals--10 ohms each to the chassis ground. Makes my SDAs unlistenable.
    pitdogg2 wrote: »
    I use a Aragon 8008bb, I must use a dreadnought with my 2.3tl's.
    Too late for me to edit my previous post.

    A simple jumper wire--less than a foot of plain multi-strand copper wire and two banana plugs--connecting the negative terminals (which bypasses the two ten-ohm resistors) cures the problem with using that amp on SDA speakers.

    No isolation transformer can be used on SDA 1B speakers without causing other problems.

  • stubby2
    stubby2 Posts: 40
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    pitdogg2 wrote: »
    stubby2 wrote: »
    Thanks for the heads up about HiFi Co!

    The Aragon is the 8008X3. It and the 8008X5 are common ground.

    Very nice! I use a Aragon 8008bb, I must use a dreadnought with my 2.3tl's.

    The 8008BB is a beast! The X3 has a single 2000VA torroid and a bit less filter capacitance, but does have the same 12 output transistors per channel.
    My Aragon 8002 is dual mono and non common ground.
    Polk SDA SRS 2A
    Aragon 8008X3
    Aragon Soundstage
    Multiple Digital Sources
  • stubby2
    stubby2 Posts: 40
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    gregmoyers wrote: »
    C coil is a noticeable improvement in low end. Worthwhile for sure.vefukx409vph.jpeg
    v36yng0zdoqv.jpeg
    efau8emlwugz.jpeg

    Nice! May I ask what wire you use between the inductor and the circuit board?
    Polk SDA SRS 2A
    Aragon 8008X3
    Aragon Soundstage
    Multiple Digital Sources
  • gregmoyers
    gregmoyers Posts: 140
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  • stubby2
    stubby2 Posts: 40
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    gregmoyers wrote: »
    14 ga solid.

    Thank you!
    Polk SDA SRS 2A
    Aragon 8008X3
    Aragon Soundstage
    Multiple Digital Sources
  • stubby2
    stubby2 Posts: 40
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    gregmoyers wrote: »
    14 ga solid.

    Thank you!
    Polk SDA SRS 2A
    Aragon 8008X3
    Aragon Soundstage
    Multiple Digital Sources