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  1. #1

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    Default SDA 2B HF Inductor Measurements

    L1 - 2.66 MH, 1.35 ohms
    L2 - 1.25 MH, .89 ohms
    SDA Inductor (L3?) - 16.29 MH, 2.65 Ohms
    www.Vr3Mods.com ///// www.Version3Audio.com

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  2. #2

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    I forgot one - will update in a sec, sorry
    www.Vr3Mods.com ///// www.Version3Audio.com

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  3. #3

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    Smallest Inductor - in high frequency circuit -

    .42 MH, .72 ohms
    www.Vr3Mods.com ///// www.Version3Audio.com

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  4. #4

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    Quote Originally Posted by VR3 View Post
    L1 - 2.66 MH, 1.35 ohms
    L2 - 1.25 MH, .89 ohms
    SDA Inductor (L3?) - 16.29 MH, 2.65 Ohms
    .42 MH, .72 ohms
    I measured similar values for the stock inductors in my CRS+'s (same crossover as SDA 2B) prior to replacing them. A brief discussion of that mod is in figures 11-13 of this post. The prior CRS+ crossover modification is discussed in this thread.

    0.40 mH, 22 AWG -----> 0.416 mH, 0.71 ohms.
    1.25 mH, 20 AWG -----> 1.279 mH, 0.88 ohms.
    2.50 mH, 20 AWG -----> 2.470 mH, 1.27 ohms.
    16 mH, 18 AWG ----->16.300 mH, 2.66 ohms.
    Last edited by DarqueKnight; 06-21-2012 at 12:49 AM.
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically...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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  5. #5

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    Did you end up replacing them? If so, what did you find that was similar??

    The closest thing I have found ERSE makes but I don't think it would be worth replacing them with the ERSE inductors...
    www.Vr3Mods.com ///// www.Version3Audio.com

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  6. #6

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    NVM, I see you did replace them with the Jantzen inductors ---
    www.Vr3Mods.com ///// www.Version3Audio.com

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  7. #7

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    DK, where did you order those inductors from?

    Parts Express does not seem to stock some of the values....

    Thanks!
    www.Vr3Mods.com ///// www.Version3Audio.com

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  8. #8

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    The replacement Jantzen inductors (special ordered from Parts Express) had the following measurements:

    0.40 mH, 22 AWG -----> 0.413 mH, 0.64 ohms.
    1.25 mH, 20 AWG -----> 1.259 mH, 0.82 ohms.
    2.50 mH, 20 AWG -----> 2.509 mH, 1.34 ohms.

    Jantzen part numbers and prices were:

    0.40 mH, 22 AWG, Part No. 1489, $2.86.
    1.25 mH, 20 AWG, Part No. 1137, $5.63.
    2.50 mH, 20 AWG, Part No. 1695, $8.61.

    The 16 mH, 18 AWG SDA inductors in two or my CRS+ pairs were replaced with Northcreek 16 mH, 14 AWG, 1.3 ohm inductors, $114.30 each.

    The 16 mH SDA inductors in my third pair of CRS+'s was replaced with Solen 16 mH, 14 AWG, 0.945 ohm inductors, $67.68, part number S1416.0. The Solen inductors outperformed the Northcreeks and cost 40% less. The Solen inductors were ordered from Parts Connexion.
    "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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  9. #9

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    How long did it take you to receive your inductors being a special order?

    Thanks!
    www.Vr3Mods.com ///// www.Version3Audio.com

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  10. #10

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    The Jantzen inductors took six weeks to arrive from Denmark. The standard special order delivery period for Jantzen parts is eight weeks. The Solen inductors took eight days to arrive from Canada.
    "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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