SDA Custom Circuit Boards ?

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  • heiney9
    heiney9 Posts: 25,197
    edited October 2010
    Nice work gim54pod!

    Michael, sweet components.

    Hell yeah!!!!!!
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • headrott
    headrott Posts: 5,496
    edited October 2010
    Looks nice! Plenty of room and very well organized.

    Greg
    Relayer-Big-O-Poster.jpg
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:
    "I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion." :\
    My response is: If you need 60 seconds to respond in one sentence, you probably should't be evaluating Polk speakers.....

    "Green leaves reveal the heart spoken Khatru"- Jon Anderson

    "Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee
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  • Toolfan66
    Toolfan66 Posts: 17,310
    edited October 2010
    Nice!!! Bring it on...
    Polk Audio SDA 2.3tl Fully Hot Rodded. 😎

    SVS SB16 X2

    Cary SLP-05/Ultimate Upgrade.
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    Cary DMS 800PV Network
    OPPO UDP 205/ModWright Modification
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    Jolida JD9 Fully Modified

    VPI MW-1 Cyclone RCM

    MIT Shotgun 3 cables throughout / Except TT, and PC’s
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  • george daniel
    george daniel Posts: 12,096
    edited October 2010
    do it:)
    JC approves....he told me so. (F-1 nut)
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  • audiobilly
    audiobilly Posts: 351
    edited October 2010
    Go Go Gim!!! Brilliant!
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  • michaeljhsda2
    michaeljhsda2 Posts: 2,185
    edited October 2010
    gim54pod wrote: »
    Ok guys I've got the design of the PCB's done and they have extra mounting holes at the four corners. The boards measure 10 inches wide and 5 1/4 inches high and should work for any SDA's that use the single board design (2B, CRS+, 1C, SRS 2 (1987), 3.1TL, 2.3, 2.3TL, 1.2, 1.2TL). Let me know what you think.

    ~ gimpod

    Since the 1C's use a 40uF cap (I bought the ClarityCap 39 uF) would it straddle where the two 20uF caps go or just install it in one of the 20 uF locations?
    SDA SRS 2.3TL's
    Silk Audio MS-90-BT integrated tube amp
    Yaqin MS-20L integrated tube amp
    SDA 2B TL's
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  • nooshinjohn
    nooshinjohn Posts: 25,448
    edited October 2010
    Do the 1c's and the 2.3TL's use the same board?
    The Gear... Carver "Statement" Mono-blocks, Mcintosh C2300 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon 680d DSD

    “When once a Republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.”— Thomas Jefferson
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  • mole'
    mole' Posts: 3,160
    edited October 2010
    awesome work there

    +1 for 2.3TL
    mole'
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  • gimpod
    gimpod Posts: 1,793
    edited October 2010
    Thanks for your comments and questions. First off I'm working up a general instruction sheet that will go with the boards. I will try and answer your questions.

    Mounting: There is a small problem with the CRS+'s and the SRS's that have the crossover mounting plate. On the CRS's you would have to mount the board in the bottom of the enclosure and extend the leads up to the big 16mH inductor. On the SRS's I would suggest that you could mount the board on the crossover plate plug everything in and then slide the top in at an angle then move the whole assembly up so you can slip the bottom in and then bolt in place. Or you could just put the crossover plate in first then slide the assembled crossover through the hole for the PR and up then put the bolt in, or you could mount the board on a cross brace or maybe between the plate and the bottom pair of 6 1/2" drivers. I tried making a one board fits all with a height of 4 1/2" but it ended up being 15" wide which also wouldn't fit through the cabinet opening measuring 4-3/4" high by 14-3/16" wide.

    Now as far as what board fits what SDA's Polk used the exact same board for all these SDA's "2B, CRS+, 1C, SRS 2 (1987), 3.1TL, 2.3, 2.3TL, 1.2, 1.2TL" just used different components for the different models. If you look at the right side of the stock board where it says Polkaudio right next to it it says SDA SERIES hence the single board design.

    Now as far as the cap for C2 if you decide to use a single cap it would go in ether one of the C2 spots just leave the other one empty.

    ~ gimpod
    “The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain
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  • thejck
    thejck Posts: 849
    edited October 2010
    i might be interested in a set of 1.2tl boards. thank you.

    do they have the same holes to fit the white clippy things that go into the big inductor that stay attached to the crossover plate?
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  • michaeljhsda2
    michaeljhsda2 Posts: 2,185
    edited October 2010
    thejck wrote: »
    i might be interested in a set of 1.2tl boards. thank you.

    do they have the same holes to fit the white clippy things that go into the big inductor that stay attached to the crossover plate?

    It looks like the holes for the standoffs are where they should be compared to the original board.
    SDA SRS 2.3TL's
    Silk Audio MS-90-BT integrated tube amp
    Yaqin MS-20L integrated tube amp
    SDA 2B TL's
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  • gimpod
    gimpod Posts: 1,793
    edited October 2010
    Yes the mounting holes are the same pattern as the original with one difference the holes are larger so you can use 8/32 nylon threaded standoffs instead of the original "white clippy things" PCB locking standoffs which IMO would not hold the bigger board well enough.

    On a side note I'm moving next month and then there's Christmas, Also there's still the testing phase to do so if everything go's as planned the boards should be ready for sale by January.

    ~ gimpod
    “The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain
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  • thejck
    thejck Posts: 849
    edited October 2010
    I know there is 2 sides to the fence but has anyone had any success with getting all new inductors and compared them to the originals to see if there is a difference.

    I would like to experiment with this board and new inductors and have a spare set of crossovers handy.
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  • gimpod
    gimpod Posts: 1,793
    edited October 2010
    thejck wrote: »
    I know there is 2 sides to the fence but has anyone had any success with getting all new inductors and compared them to the originals to see if there is a difference.

    I would like to experiment with this board and new inductors and have a spare set of crossovers handy.

    I don't know, I looked in to it but found it impossible to find exact replacements and the one's you could find that were close were very expensive, The only other way I can think of would be to hand wind your own and that also get's very expensive i.e. making your own forms getting the different gauge wire and lots of it.

    ~ gimpod
    “The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain
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  • Face
    Face Posts: 14,340
    edited October 2010
    I wouldn't bother with different inductors. Comparing air core to air core, as long as the DCR is correct for the circuit and gauge has sufficient power handling for it's intended purpose, I haven't heard a difference from swapping out cheapo inductors for fancy foils. The only way I could see improving them is to pot them in some sort of resin.

    I would recommend swapping out inductors is if a solid core is used in a midrange or tweeter circuit, but the new inductor must have the same DCR, or you'll alter the frequency response of the speaker, most likely in a bad way.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • Outfitter03
    Outfitter03 Posts: 563
    edited October 2010
    Face as an example if I was looking to replace a solid core in a midrange with an inductance of 0.8 mh +/- 5% with a DCR of 0.25 ohm and I had the following choices, which is close enough?

    0.8mh aircore with a DCR of 0.30 0hm and a cost of $11.

    0.82mh copper foil air core with a DCR of 0.236 ohm with a cost of $24.

    The inductor is in both the midrange and bass signal path. My guess is it would be better to spend the extra $26 dollars and have a DCR within 0.02 of an ohm. Is this correct?
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  • FTGV
    FTGV Posts: 3,649
    edited October 2010
    I'm not face but IMO the .8mh .3 ohm is close enough so save the coin.The extra .05 ohm will be insignificant.
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  • Face
    Face Posts: 14,340
    edited October 2010
    Because of my OCD, I would go with the foil as it's DCR and mH are both within 5% of the OEM part. Sorry Fred. :)
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • FTGV
    FTGV Posts: 3,649
    edited October 2010
    I'm a tad OC aswell but would let the .05 ohm's slide as it should negligable.:biggrin:
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  • Outfitter03
    Outfitter03 Posts: 563
    edited October 2010
    Thanks both for the reply. Sounds like less than 5% is desired when a perfect match is not in the cards. Any more than 5% is a budget/quality/comfort factor decision and therefore more subjective and higher risk. This gives me a good rule of thumb to follow until I get some experience in doing upgrades.
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  • Earthy
    Earthy Posts: 488
    edited October 2010
    Great idea! I can see myself wanting a pair for my 2.3TL's It would be nice to have it all set up and ready to quickly swap in. We might even see a growing market for used crossovers.
    Polk Audio SDA SRS 2.3TL
    Parasound Halo A21
    Parasound Halo P3

    Home theater
    Polk LSiM 707, 706c, 703, 705
    Polk Blackstone TL3 for height
    SVS PB12-ISD Sub
    Denon AVR-X6400h
    Parasound Halo A51
    LG OLED65B7A
    Sony UBPX800
    Logitech Harmony Elite
    PC LSiM 703
    Spare LSIM 702 and 706c

    Home Theater #2
    Polk Audio LS70, CS350LS, LSF/X, S4
    Onkyo TX-NR808



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  • gimpod
    gimpod Posts: 1,793
    edited November 2010
    The design is done and I went and ordered a very small batch of boards that are going to be going out to a select group of CP members for testing, evaluation and reviewing. I should be getting the boards Tuesday and hopefully shipped out to the tester's by Thursday / Friday at the latest. Now if the testing go's well and I don't have to make any design changes I should be able to start taking orders for boards by late December early January. At this point it's all up to the testers (You guys know who you are :wink:).

    That's it for now. ~ gimpod
    “The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain
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  • thejck
    thejck Posts: 849
    edited November 2010
    Awesome work.. Looking forward to this.
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  • Earthy
    Earthy Posts: 488
    edited November 2010
    I want one pair for my 2.3TL's. I have no background for being a tester. I am more of a pester. Put me on the list for your orders. I want a pair so I can get them built and just do a quick swap into my speakers.
    Polk Audio SDA SRS 2.3TL
    Parasound Halo A21
    Parasound Halo P3

    Home theater
    Polk LSiM 707, 706c, 703, 705
    Polk Blackstone TL3 for height
    SVS PB12-ISD Sub
    Denon AVR-X6400h
    Parasound Halo A51
    LG OLED65B7A
    Sony UBPX800
    Logitech Harmony Elite
    PC LSiM 703
    Spare LSIM 702 and 706c

    Home Theater #2
    Polk Audio LS70, CS350LS, LSF/X, S4
    Onkyo TX-NR808



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  • mikekipina
    mikekipina Posts: 2
    edited November 2010
    I would be interetred in the boards for the SRS 2(1987) that I have.

    Let me know if and when.
    mjk:eek:
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  • newrival
    newrival Posts: 2,017
    edited November 2010
    Will there be a board for my original SRS's? only say the 1.2 and 1.2tl.
    I'll be in 100% if its available.
    design is where science and art break even.
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  • gimpod
    gimpod Posts: 1,793
    edited November 2010
    newrival wrote: »
    Will there be a board for my original SRS's? only say the 1.2 and 1.2tl.
    I'll be in 100% if its available.

    They are going to be for the single board crossover SDA's with a Pin/Blade Interlink Cable (2B, CRS+, 1C, SRS 2 (1987), SRS 3.1TL, SRS 2.3, SRS 2.3TL, SRS 1.2 and SRS 1.2TL).
    “The two most important days in your life are the day you are born and the day you find out why.” ~ Mark Twain
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  • newrival
    newrival Posts: 2,017
    edited November 2010
    bummer...

    well, put me down for on for my CRS+'s. I guess I could let them have a little fun too...
    design is where science and art break even.
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  • jmitchnh
    jmitchnh Posts: 31
    edited November 2010
    Thanks for making your boards avail to us Gimpod. I'll take a set for my SDA-1Cs.
    Life's too short too listen to bad speakers
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  • JimMueller
    JimMueller Posts: 100
    edited November 2010
    I'm interested in a set for my 1C's. Now to dig up the 'parts list'.
    Yamaha RX-2600 receiver, Nakamichi Dragon, Mitsubishi HS-U80 VCR, Pioneer DVL-90 LD Player, Sony BDP-S550 Blu-ray player, Sony CDP-X555ES CD player, Carver TFM-42, Carver AV-634, Panasonic TC-P54V10 plasma, BenQ W1070 PJ, Fisher MT-90 turntable, AKG-K340 headphones, Polk SDA-1C mains, CS-400i center, FX A4 surrounds, Rti A1 surround backs
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