SDA 1.2TL Inductor Part #'s needed

Outlaw9
Outlaw9 Posts: 11
in Vintage Speakers
Hello,

I am looking at upgrading my crossovers in my SDA 1.2TL, I have already upgraded the tweeters to the 198's. I am looking at using gimpods boards with the sonicaps listed, from what I gather the sonicap is very neutral. While I am doing the modifications I would like to upgrade the inductors for the bass drive. However information seems to be limited on what inductor/s needs to be purchased. Can someone provide me the values and part numbers to the inductors I would need to go down to 4 ohms? Thank you in advance!
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  • RobbyKY
    RobbyKY Posts: 117
    For the low frequency stock section you have:
    1.0mH 18awg 0.7DCR
    2.0mH 20awg 1.3DCR
    16mH 18awg 2.8DCR

    Solen is desired. For a stock slip in replacement, try these:
    1.0mH 18awg 0.7 DCR #S181.0 @ $9.99ea
    2.0mH 20awg 1.3DCR #S202.0 @ $9.7ea
    16mH 18awg 2.8DCR #S1816.0 @ $38.45ea

    To drop your overall DCR, open your wallet for this Solen baby but beware, it's massive:
    16mH 10awg 0.56DCR #S1016.0 @ $250.65ea

    Many like the Erse SuperQ for the 16mH dimensional inductor. You can go with the:
    Erse ESQ55-16-1800 with a 0.554DCR @ $28 but be aware this is an 18mH version that must be unwound using a proper inductance meter to ensure accuracy and will get you down to about the same overall DCR as the big Solen.

    I have two sets of 1.2tl's, one set with the big Solen and the second set where I went cheap and used the Erse. The Erse has more defined bass but the Solen version is used as my critical listening setup. Go big or go home and drop the extra $500 on the Solens here.

    A third option is the Jantzen C-Coil Toroidal for the dimensional circuit:
    16mH 14awh 0.16DCR #000-6577 @ $75.08ea
    I've not personally heard this one but some swear by it. Beware the ultra low DCR may drop your overall DCR down to a point that gives your amplifier some issues so proceed with due caution.


    Just for the fun of it, replace the high frequency inductors while you're in there.

    You have:
    0.4mH 22awg 0.68DCR
    0.7mH 25awg 1.69DCR

    Janzen is a must here, you need:
    0.4mH 22awg 0.640DCR #000-1489
    0.75mH 26awg 1.81DCR #000-1160 but you'll need to unwind down to 0.7mH.

    Robby
    Media Room: Parasound JC-5, Cambridge 851N, Schiit Freya, SDA SRS 1.2tl
    Game Room: Carver M4.0t, Carver C-4000, Oppo BDP-105, SDA SRS 1.2tl
    Bar/Card Room: Carver TFM-55, Carver C-1(BillD), Oppo BDP-93, SDA SRS 3.1
    Son's Room: Carver TFM-55, Carver C-1(BillD), Laptop/AQ Dragonfly, SDA SRS 3.1
    Bedroom: McIntosh MC150, Cambridge CXN, SDA 2Btl
    Outdoor Pool Area: Yamaha R-N803 with four Polk Atrium 6
    HT: Polk RTi A9s, CSi-A6, RT-65, RTi-A3's, Marantz SR5012, XPA3, UDP-203, Epson 5040UB


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  • RobbyKY
    RobbyKY Posts: 117
    Jantzen, not Janzen. Sorry, dropped a "t" there.
    Media Room: Parasound JC-5, Cambridge 851N, Schiit Freya, SDA SRS 1.2tl
    Game Room: Carver M4.0t, Carver C-4000, Oppo BDP-105, SDA SRS 1.2tl
    Bar/Card Room: Carver TFM-55, Carver C-1(BillD), Oppo BDP-93, SDA SRS 3.1
    Son's Room: Carver TFM-55, Carver C-1(BillD), Laptop/AQ Dragonfly, SDA SRS 3.1
    Bedroom: McIntosh MC150, Cambridge CXN, SDA 2Btl
    Outdoor Pool Area: Yamaha R-N803 with four Polk Atrium 6
    HT: Polk RTi A9s, CSi-A6, RT-65, RTi-A3's, Marantz SR5012, XPA3, UDP-203, Epson 5040UB


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