SDA 1C crossover question

george daniel
george daniel Posts: 12,096
edited May 2007 in Vintage Speakers
I've going to replace the inductors, if I understand the schematic, the inductor at the upper left of the pic is the 1.25 mHz. Can someone tell me if that is correct,as I cannot find an identification. Thanks in advance--george
JC approves....he told me so. (F-1 nut)
Post edited by george daniel on
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  • ben62670
    ben62670 Posts: 15,969
    edited May 2007
    The top left is a 1.25mH
    The bottom Left is a 2.5mH
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • I-SIG
    I-SIG Posts: 2,243
    edited May 2007
    Most folks say not replace those because apparently there is a lot more to inductors than the Henrys.

    Wes
    Link: http://polkarmy.com/forums

    Sony 75" Bravia 4K | Polk Audio SDA-SRS's (w/RDO's & Vampire Posts) + SVS PC+ 25-31 | AudioQuest Granite (mids) + BWA Silver (highs) | Cary Audio CAD-200 | Signal Cable Silver Resolution XLR's | Rotel Michi P5 | Signal Cable Silver Resolution XLR's | Cambridge Audio azur 840C--Wadia 170i + iPod jammed w/ lossless audio--Oppo 970 | Pure|AV PF31d
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  • george daniel
    george daniel Posts: 12,096
    edited May 2007
    thanks,, just wanted to double check,,now if my diagnostic skills are on, this should fix the problem. Got these (1C's) off e-pay for 249.00,very good condition. Upon listeming to them the left side seemed lacking in the mids,,upon removing the passice ,the inductor was laying in the bottom of the cabinet,I resoldered, but the problem still persists,,hopefully this will be the end of this thread,,we'll know in a little while. :)
    JC approves....he told me so. (F-1 nut)
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  • heiney9
    heiney9 Posts: 25,204
    edited May 2007
    george daniel wrote: »
    thanks,, just wanted to double check,,now if my diagnostic skills are on, this should fix the problem. Got these (1C's) off e-pay for 249.00,very good condition. Upon listeming to them the left side seemed lacking in the mids,,upon removing the passice ,the inductor was laying in the bottom of the cabinet,I resoldered, but the problem still persists,,hopefully this will be the end of this thread,,we'll know in a little while. :)


    At Chicago PF I ended up leaving with Normanality's SDA 1C's. It's my understanding a former member (Anonymouse-haven't seen him around in awhile) upgraded the x-overs with Sonic Caps, and Norm and Rich (SCompRacer) added Vampire connectors and a more user friendly IC cable with a bannana plug on each end as well as the RD0 tweets. No mention of replacing any inductors.

    I was tweaking last night and have them 11 inches from the back wall and almost 6 feet apart. Initially I wasn't getting that euphoric SDA effect so I moved each speaker 3" closer to each other (total of 6") and WOW that really made a difference.

    I guess my point is keep looking for the issue, I'm sure fixing the inductor helped. :D

    H9
    "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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  • george daniel
    george daniel Posts: 12,096
    edited May 2007
    heiney9 wrote: »
    At Chicago PF I ended up leaving with Normanality's SDA 1C's. It's my understanding a former member (Anonymouse-haven't seen him around in awhile) upgraded the x-overs with Sonic Caps, and Norm and Rich (SCompRacer) added Vampire connectors and a more user friendly IC cable with a bannana plug on each end as well as the RD0 tweets. No mention of replacing any inductors.

    I was tweaking last night and have them 11 inches from the back wall and almost 6 feet apart. Initially I wasn't getting that euphoric SDA effect so I moved each speaker 3" closer to each other (total of 6") and WOW that really made a difference.

    I guess my point is keep looking for the issue, I'm sure fixing the inductor helped. :D

    H9

    I have already replaced all the caps with sonicaps,mills resistors, inductors,,,now I'm struggling with no tweeter output after the inductor change,,hell,,, things have got to improve,I've never had this much trouble with crossovers before,when I get home today,I'll check them out. :o:(
    JC approves....he told me so. (F-1 nut)
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  • heiney9
    heiney9 Posts: 25,204
    edited May 2007
    george daniel wrote: »
    I have already replaced all the caps with sonicaps,mills resistors, inductors,,,now I'm struggling with no tweeter output after the inductor change,,hell,,, things have got to improve,I've never had this much trouble with crossovers before,when I get home today,I'll check them out. :o:(

    I feel your pain. One of the BIG pluses to getting Norm's SDA's were the fact that someone else (competent) had already done all the upgrades. :D

    Good luck, I'm sure you'll sort it out. :)
    "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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  • SCompRacer
    SCompRacer Posts: 8,511
    edited May 2007
    Brock, anonymouse performed all the mods to the 1C's you got from Norm. All I did was make the IC a little longer. I am sorry for the confusion. I was running on empty Saturday.
    Salk SoundScape 8's * Audio Research Reference 3 * Bottlehead Eros Phono * Park's Audio Budgie SUT * Krell KSA-250 * Harmonic Technology Pro 9+ * Signature Series Sonore Music Server w/Deux PS * Roon * Gustard R26 DAC / Singxer SU-6 DDC * Heavy Plinth Lenco L75 Idler Drive * AA MG-1 Linear Air Bearing Arm * AT33PTG/II & Denon 103R * Richard Gray 600S * NHT B-12d subs * GIK Acoustic Treatments * Sennheiser HD650 *
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  • engtaz
    engtaz Posts: 7,664
    edited May 2007
    good luck george. Are those the one's you robbed from Orlando. LOL
    engtaz

    I love how music can brighten up a bad day.
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  • george daniel
    george daniel Posts: 12,096
    edited May 2007
    engtaz wrote: »
    good luck george. Are those the one's you robbed from Orlando. LOL

    yep,, and I'm almost ready to throw in the towel if my efforts this afternoon do not yield the desired results.
    JC approves....he told me so. (F-1 nut)
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  • heiney9
    heiney9 Posts: 25,204
    edited May 2007
    george daniel wrote: »
    yep,, and I'm almost ready to throw in the towel if my efforts this afternoon do not yield the desired results.

    I'm pretty sure a towel (wet or dry) won't fix your problem. :p:p

    H9
    "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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  • F1nut
    F1nut Posts: 50,734
    edited May 2007
    Did you remove the polyswitch. If so, you need to replace it with a jumper.

    Also, check the tweeter and driver output connectors. Both have 4 pins and can be easily swapped by mistake.
    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

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  • george daniel
    george daniel Posts: 12,096
    edited May 2007
    Jesse,I had replaced the polyswitches with jumpers,I wiggled the jumper,,and the tweets started working,so I resoldered it,,,problem solved,,next I replaced the inductors (as one was laying in the bottom of the cabinet upon arrival),problem solved. They are playing right now,so I'll give em a few hours before I button them up. I'll post pics later.I won't even begin to tell ya'll what went through my mind last night,as I was extremely frustrated(it's covered in another thread).Bottom line, caps replaced with sonicaps,mills resistors,inductors from madisound,binding posts and SDA cable connection are Vampire BP-hex, I think I'll take up go-kart racing as a new hobby.:)
    This is my LAST set of 1C's,,I can assure you of that. :D
    JC approves....he told me so. (F-1 nut)
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