SDA 1C Update
Faustin
Posts: 1,149
A month or so ago I purchased a set of SDA 1c's that had the crossovers upgraded with Sonicap Gen 1 caps and mills resistors and RDO-194 tweeters. they also had Cardas binding posts. They did not sound as well as I had hope, so I looked inside and the tweeters were wired out of phase and the bindings posts were reversed as well. Once that was corrected they sounded quite a bit better but I had a feeling the crossover rebuild had not had a chance to burn in. I removed the poly switch and replace it with 2 1 ohm resistors and also removed the silver mica cap. I installed new ERSA bass inductors (thanks wessmasguy) ,dynamatted the drivers and pr's, made sure the cabinets were sealed, installed hurricane nuts and machine screws, put new gaskets on the drivers, and installed Black Hole 5 behind the 6.5's. I then let them play on a low volume on a FM stations for weeks to make sure everything was burned in. Some people pooh pooh the idea of caps burning in, but I have to say that this is the 3rd set of Polk speakers that I have rebuilt and the transformation is there. I am not the only one that "thinks " there is a difference. My wife and several friends have heard the difference on their own and mentioned it to me. I was very disappointed with the 1c's initially when I bought them but I can honestly say that they sound fantastic.
Post edited by Faustin on
Comments
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Good job on the corrections.I removed the poly switch and replace it with 2 1 ohm resistors and also removed the silver mica cap.
A 1 ohm resistor is too much, shouldn't be more than .5 ohm.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 -
It's amazing to me how many out of phase or miswired SDAs I heard of from here. In the Polk world black is positive and the rest of the world black is negative and that's just one glaring example of an easy mistake to be made.Another on the old tweeters polarity was just etched in on the back plate and not on the painted terminal lugs as w/ the new 194s. W/o the SDA handbook and schematic and learning here I never would have known that either. Glad the sound improved for you ,after all getting the upgrades is what's going make them to last another 25 years ...2chl- Adcom GFA- 555-Onkyo P-3150v pre/amp- JVC-QL-A200 tt- Denon 1940 ci cdp- Adcom GFS-6 -Modded '87 SDA 2Bs - Dynamat Ext.- BH-5- X-Overs VR-3, RDO-194 tweeters, Larry's Rings, Speakon/Neutrik I/C- Cherry stain tops Advent Maestros,Ohm model E
H/T- Toshiba au40" flat- Yamaha RX- V665 avr- YSD-11 Dock- I-Pod- Klipsch #400HD Speaker set-
Bdrm- Nikko 6065 receiver- JBL -G-200s--Pioneer 305 headphones--Sony CE375-5 disc -
Two 1 ohm wired in parallel JesseGood job on the corrections.
A 1 ohm resistor is too much, shouldn't be more than .5 ohm.Home Theater/2 Channel:
Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer
dhsspeakerservice.com/ -
Glad you're enjoying them Bruce. It's hard to go back to conventional speakers once you've heard SDAs. Was for me anyway.Home Theater/2 Channel:
Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer
dhsspeakerservice.com/ -
westmassguy wrote: »Two 1 ohm wired in parallel Jesse
Ah yes, thanks.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 -
westmassguy wrote: »Two 1 ohm wired in parallel Jesse
Yes, I know they're the electrical equivalent, but why not just a single 0.5-Ohm resistor instead of the two 1-Ohm resistors in parallel? Unless.....he just happen to have a drawer full of 1's and no 0.5'ers! -
Because the 1Cs have two Tweeters. I use a 12 watt Mills for Single Tweeter, two 12 watt Mills for two Tweeters, and 3 12 watt Mills for big SRSs with 4 Tweeters. Two 1 ohm, 12 watt Resistors in parallel, equals .5 ohm @ 24 watts. Three 1.5 ohm, 12 watt Resistors in parallel, equals .5 ohm @ 36 watts. I prefer to oversize a bit, to prevent heating up the Resistors. Some Resistor's values tend to drift with temperature.teekay0007 wrote: »Yes, I know they're the electrical equivalent, but why not just a single 0.5-Ohm resistor instead of the two 1-Ohm resistors in parallel? Unless.....he just happen to have a drawer full of 1's and no 0.5'ers!Home Theater/2 Channel:
Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer
dhsspeakerservice.com/ -
I prefer to oversize a bit, to prevent heating up the Resistors.
LOL....I'll say, considering the original resistors were 5 watt and I don't recall anyone cooking one.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 -
You'd be surprised how many crossovers I've done that have burned out resistors, heat damaged resistors, and burned circuit boards under the resistors, even melted solder joints. They're the weakest link.LOL....I'll say, considering the original resistors were 5 watt and I don't recall anyone cooking one.Home Theater/2 Channel:
Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer
dhsspeakerservice.com/ -
Hello this is Apple 60 I just recently purchased a set of SDA 1c's and have had nothing but trouble with them. I believe they were damaged internally. The crossovers were laying in the bottom of the cabinets wires not hooked up,Two frozen drivers. I replaced my crossovers with a working set of working originals.Bought all new drivers through Polk. Hooked them up only to find out there are one or two Sl 2000 tweeters not working as well. Just bought 4 Sl 2000 tweeters and they are on the way. I hope this fixes the problem. I've never had any problems with my Monitor 10A's or my SDA CRS's. Can anyone out there tell me in their own words what the 1C's are supposed to sound like? Desperately want these sounding like they were meant to sound. Feeling Frustrated in the Midwest.
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I really enjoy mine. The only thing ive done so far is upgrade the sl2000's to rd0194-1 & that made a very big difference. I plan on doing more. Do you have the IC cord ? What are you hooking them to ? Those are fine speakers..
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Wait till you do the crossovers Randy, worth every penny IMHO
boston1450 wrote: »I really enjoy mine. The only thing ive done so far is upgrade the sl2000's to rd0194-1 & that made a very big difference. I plan on doing more. Do you have the IC cord ? What are you hooking them to ? Those are fine speakers
POLK SDA 2.3 TLS BOUGHT NEW IN 1990, Gimpod/Sonic Caps/Mills RDO-198
POLK CSI-A6 POLK MONITOR 70'S ONKYO TX NR-808 SONY CDP-333ES
PIONEER PL-510A SONY BDP S5100
POLK SDA 1C BOUGHT USED 2011,Gimpod/Sonic Caps/Mills RDO-194
ONKYO HT RC-360 SONY BDP S590 TECHNICS SL BD-1 -
if i had the funds id be right on it. Every time i get ahead something happens..
