Question about SDA-1C

billbillw
billbillw Posts: 6,895
edited May 2008 in Vintage Speakers
Are the Studio versions of the 1C electrically identical to the wood capped versions? Same crossover, drivers, etc?
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  • MillerLiteScott
    MillerLiteScott Posts: 2,561
    edited May 2008
    I believe they are. Just different cabinet and they weigh less.

    Scott
    I like speakers that are bigger than a small refrigerator but smaller than a big refrigerator:D
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  • Boywonder
    Boywonder Posts: 225
    edited May 2008
    I have a pair of studio 1C's and I've modified the crossover and replaced the tweeters with the RD-0's. Same X-over and drivers. I believe the std 1C's had two diffierent styles of crossovers (1 vs 2 PCBs). My studio's have one rectangular X-over PCB with molex connectors for the drivers; I think this was the later style X-over for the 1C. I don't know if the early version of the studio's had the 2 pc x-over boards, but anything's possible based on some of the other model production variations.
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  • billbillw
    billbillw Posts: 6,895
    edited May 2008
    Thanks guys. Gonna try a pair and see how I like them.
    For rig details, see my profile. Nothing here anymore...
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  • I-SIG
    I-SIG Posts: 2,243
    edited May 2008
    As usual, there's always an exception to the rule. Some 1C's have 2-piece crossovers. One tweeter unit and one mid/woofer unit. Those 1C's can be modified to be bi-wired or bi-amped. My Studio's have the one piece unit. Bob McG had some 1C's with the 2-piece units. To my knowledge no one has a clue where the cutoff might be between the 2.

    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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  • billbillw
    billbillw Posts: 6,895
    edited May 2008
    Does the schematic in Darqueknight's post match no matter whether they are 1-piece or 2-pieces? That's mainly what I'm worried about, if/when I decide to dig into the x-overs.
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  • I-SIG
    I-SIG Posts: 2,243
    edited May 2008
    That, I can't tell you. I can only imagine that they would match.

    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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  • heiney9
    heiney9 Posts: 25,221
    edited May 2008
    The xovers are the same except early 1C's with blade/blade used (2) x-over boards and later 1C's pin/blade (also compatible with the AI-1 cable) had a single x-over board.

    Atleast that's the way I understand it. :)

    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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  • Mike Reeter
    Mike Reeter Posts: 4,315
    edited May 2008
    Has anyone else noticed that some of the 1C models "wood caps" are Studio version cabinets that have the top/bottom caps stapled on and cloth covered side panels glued on over the Black veneer?

    I would think that all the components would be the same.
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  • billbillw
    billbillw Posts: 6,895
    edited May 2008
    Ok. I guess I have the later version that is pin/blade. I haven't taken them apart yet, but I'm going to assume that they probably have the single x-over board.
    For rig details, see my profile. Nothing here anymore...
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  • george daniel
    george daniel Posts: 12,096
    edited May 2008
    Every pin/blade SDA 1C that I've owned had the single crossover board,,however there are always exceptions,, good luck and enjoy. The 1C's are alot of fun.
    JC approves....he told me so. (F-1 nut)
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  • billbillw
    billbillw Posts: 6,895
    edited May 2008
    Thanks George. I know you've seen quite a few 1Cs. I do intend to enjoy them. Right now, they are a bit about of balance because they have 3 out of 4 silk domes and 1 SL-2000. (When I bought them, they already had 1 RDO and I swapped out the two from my RTAs)

    I will order the 4th tomorrow, so things will be balanced by the end of the week :)
    For rig details, see my profile. Nothing here anymore...
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  • Boywonder
    Boywonder Posts: 225
    edited May 2008
    Mike Reeter wrote: »
    Has anyone else noticed that some of the 1C models "wood caps" are Studio version cabinets that have the top/bottom caps stapled on and cloth covered side panels glued on over the Black veneer?

    I would think that all the components would be the same.


    If I want to convert my studio's to regular 1C's all I need is end caps and some side cloth? I think the front grills are different length because the studio's have a wood trim piece across the bottom front.

    At some point, the vinyl siding on my studios has got to go. Maybe a nice zebrawood veneer.:p
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  • Mike Reeter
    Mike Reeter Posts: 4,315
    edited May 2008
    I would say yes,The side panels are 1/4" material covered with cloth...And yes,the grills are a different measurement.
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  • F1nut
    F1nut Posts: 50,820
    edited May 2008
    Mike Reeter wrote: »
    Has anyone else noticed that some of the 1C models "wood caps" are Studio version cabinets that have the top/bottom caps stapled on and cloth covered side panels glued on over the Black veneer?

    Every 1C I've seen is like that.
    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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  • Mike Reeter
    Mike Reeter Posts: 4,315
    edited May 2008
    I said "some"...I don't know why Polk would go to the expense to cover up a veneered mdf with the top/bottom caps and side panels,instead of covering up "raw" mdf...

    The base you see is a removable fascia piece...the difference in the tweeter position is the thickness of the top cap.

    A pick of a pair on e-bay http://www.auctiva.com/hostedimages/showimage.aspx?gid=364246&ppid=1122&image=131854575&images=131854426,131854481,131854526,131854575,131854635,131854706,131854750,131854802,131854845,131854905,131855455&formats=0,0,0,0,0,0,0,0,0,0,0&format=0
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  • Boywonder
    Boywonder Posts: 225
    edited May 2008
    Thanks Mike, the link to the images pretty much answers all of my questions; besides the end caps and fabric sides, the biggest difference appears to be that the front grill is longer and wider (due to the fabric sidepanels and lack of bottom trim piece) on the regular 1C's.
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  • heiney9
    heiney9 Posts: 25,221
    edited May 2008
    F1nut wrote: »
    Every 1C I've seen is like that.

    Ditto here. According to Raife, there are some differences between the studio/regular (end capped) cabinet structure, ie; bracing, etc. Probably not much though. They certainly look nicer with the ends caps.

    Actually the difference is more between the 1B and 1C cabinet wise.
    "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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  • billbillw
    billbillw Posts: 6,895
    edited May 2008
    Any thoughts on whether its worth modifying the base of these to accept spikes?
    For rig details, see my profile. Nothing here anymore...
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  • Mike Reeter
    Mike Reeter Posts: 4,315
    edited May 2008
    billbillw wrote: »
    Any thoughts on whether its worth modifying the base of these to accept spikes?

    The 1C's are about 90 lbs. each...they don't go anywhere...but,there are some that like em' spiked.

    Myself,I would'nt go to the trouble.
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  • billbillw
    billbillw Posts: 6,895
    edited May 2008
    Mike Reeter wrote: »
    The 1C's are about 90 lbs. each...they don't go anywhere...but,there are some that like em' spiked.

    Myself,I would'nt go to the trouble.

    Mine are the studio versions and they have that cheap MDF open bottomed base. I might do it if I get bored some day and have a few bucks to throw at them.
    For rig details, see my profile. Nothing here anymore...
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  • zingo
    zingo Posts: 11,258
    edited May 2008
    PE has a few good spike kits that are well prices and would be worth a try, if you get bored as you said.
    Jake
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  • F1nut
    F1nut Posts: 50,820
    edited May 2008
    billbillw wrote: »
    Any thoughts on whether its worth modifying the base of these to accept spikes?


    Do it.
    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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  • billbillw
    billbillw Posts: 6,895
    edited May 2008
    Does anyone where to get replacements for the white plastic standoffs used to mount the X-over? Any chance Polk still has them available? I took a look inside my 1Cs today and found that the x-over on the left channel was hanging free. Little bits of broken plastic in the bottom of the cabinet. Of course, this is the same one that has a little bit damage in one corner. I'm sure it happened at the same time.

    On a side note, I didn't realize it until after I had both apart, but my serials are way different (one is 69xx and the other is 98xx) and as a result, the internal construction is a bit different. In the earlier model, the big inductor is bolted above the speaker terminals and there is very little wire slack. In the later serial, the inductor is mounted below the terminals and there is quite a bit of wire slack. I imagine its going to be a **** to remove the x-over from the one that is mounted higher (which is the one that is not broken)
    For rig details, see my profile. Nothing here anymore...
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  • Boywonder
    Boywonder Posts: 225
    edited May 2008
    I have a couple of sample kits from Richco and other Mfrs that may have some of those standoffs in them. If you let me know the length, I'll check when I get home.

    I'm guessing, but I'd bet that those standoffs are still available from the mfr even if Polk doesn't carry them anymore. You can always replace with a metal PCB standoff and screws/nuts if you need to, it'll be an upgrade!
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  • billbillw
    billbillw Posts: 6,895
    edited May 2008
    Boywonder wrote: »
    I have a couple of sample kits from Richco and other Mfrs that may have some of those standoffs in them. If you let me know the length, I'll check when I get home.

    I'm guessing, but I'd bet that those standoffs are still available from the mfr even if Polk doesn't carry them anymore. You can always replace with a metal PCB standoff and screws/nuts if you need to, it'll be an upgrade!

    I was thinking, I have the standoffs left from my Radioshack amp :)
    For rig details, see my profile. Nothing here anymore...
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  • Boywonder
    Boywonder Posts: 225
    edited May 2008
    billbillw wrote: »
    I was thinking, I have the standoffs left from my Radioshack amp :)

    I knew those Radioshack amps were good for something!;)
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