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  1. #1

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    Default Wiring SDA1s in a conventional manner

    I have a pair of SDA 1s that are very nice. This is the 2nd pair of SDAs I have tried in 15 years. i just cannot do it. I have late RTA12Bs that to me (and others who have listened) sound more defined and have more depth or a more forward sound. The SDAs sound good but the stage is from the grills back and not as sharply defined and the sound is slightly soft. There is nothing wrong with them and I am hearing the same thing reviewers of the time mentioned in pro reviews.
    Here is the question What if i wired the 2 mid drivers together ( i know they are slightly different) and the two tweeters ( they did this on the later ones anyway) and ran them and positioned them as conventional speakers? Has anyone done this? I know people have but never thought to ask what it sounds like. thanks,keith

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    The horror.

    Tweeters placed side by side usually do not image well. Have you ever tried just disconnecting the SDA cable, and see if you like that better? Or just disconnect the SDA tweeter and see how that sounds. Personally, I never liked the SDA's when they had the SDA tweeter.

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    Quote Originally Posted by geppy1 View Post
    I have a pair of SDA 1s that are very nice. This is the 2nd pair of SDAs I have tried in 15 years. i just cannot do it. I have late RTA12Bs that to me (and others who have listened) sound more defined and have more depth or a more forward sound. The SDAs sound good but the stage is from the grills back and not as sharply defined and the sound is slightly soft. There is nothing wrong with them and I am hearing the same thing reviewers of the time mentioned in pro reviews.
    Here is the question What if i wired the 2 mid drivers together ( i know they are slightly different) and the two tweeters ( they did this on the later ones anyway) and ran them and positioned them as conventional speakers? Has anyone done this? I know people have but never thought to ask what it sounds like. thanks,keith
    Why????????????????????????????????

    Just run the RTA12's, sell the SDA's, and be done with it. Duh.

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

    Panasonic TH-42PHD8UK 42" HDTV | 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 | Wyred 4 Sound STP/SE Pre | 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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    Quote Originally Posted by geppy1 View Post
    Here is the question What if i wired the 2 mid drivers together ( i know they are slightly different) and the two tweeters ( they did this on the later ones anyway) and ran them and positioned them as conventional speakers? Has anyone done this? I know people have but never thought to ask what it sounds like. thanks,keith
    Nope, just sell them. The side by side tweeters would be awful for imaging, soundstage, etc. if they were wired normally. Same with the drivers. Just sell them and let someone else enjoy them.

    Perhaps sometime in the near future you could try one of the last or next to last gen. SDA's. Th earlier gen's with the dimesional tweeter are a little different. I've found the last couple generations to be much better and more forgiving of listening position and give a much "better and defined soundstage"

    H9
    Last edited by heiney9; 10-14-2007 at 10:24 PM.
    "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 Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  5. #5

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    ^What he said^
    '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 turd by the clean end."

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    Quote Originally Posted by I-SIG View Post
    Why????????????????????????????????

    Just run the RTA12's, sell the SDA's, and be done with it. Duh.

    Wes
    best advice out there.. sell the SDA's, keep the RTA12's. the RTA12's are a beautiful sounding speaker.

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    Thanks all i am afraid to let these go to soon as they have very little time on them are in great shape and came with everything boxes manuals reviews ect. I tried some highly tooted solid core wire last night and the depth increaed with a sharpening of defintion and attack. Are SDAs more sensitive to speaker wire changes? Is there a wire people have found works best with SDAs? Also it is interesting these are very early 1983 and all the 6.5s are MW6600X not MW7600 and MW7500 as the manual says and not 6501s as this site says. Wonder what that means. I have put in a request to DK for his volume on SDAs. Sounds like interesting reading no matter what happens.

  8. #8

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    Quote Originally Posted by geppy1 View Post
    Thanks all i am afraid to let these go to soon as they have very little time on them are in great shape and came with everything boxes manuals reviews ect. I tried some highly tooted solid core wire last night and the depth increaed with a sharpening of defintion and attack. Are SDAs more sensitive to speaker wire changes? Is there a wire people have found works best with SDAs? Also it is interesting these are very early 1983 and all the 6.5s are MW6600X not MW7600 and MW7500 as the manual says and not 6501s as this site says. Wonder what that means. I have put in a request to DK for his volume on SDAs. Sounds like interesting reading no matter what happens.
    I've found all speakers (with the right gear) are sensitive to cable changes. By all means make sure you give them a good run to see if you will like them or not. But those are among the first generation of SDA's and I can assure you the later gens. are leaps and bounds better in the areas you seem to be worried about. Don't be afraid to let them go if they don't work for you and look for a pair of 2B's, 1C's, 2.3 or 2.3 TL, SRS 2, etc.

    The early SDA's are COOL, but having the dimensional tweeter is not eveyones' cup of tea. The drivers, cabinets, and crossovers all were greatly improved in later gens.

    YMMV

    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 Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  9. #9

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    Quote Originally Posted by WilliamM2 View Post
    The horror.

    Tweeters placed side by side usually do not image well. Have you ever tried just disconnecting the SDA cable, and see if you like that better? Or just disconnect the SDA tweeter and see how that sounds. Personally, I never liked the SDA's when they had the SDA tweeter.
    With the SDA CRS he could wire them conventionally and then just stand the speakers on their sides - Voila! Vertically placed tweeters :p

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    what would happen if he just disconnect the sda tweeter in each cabinent? leaving only the one tweeter active? may sound ok then. worth a try at least.

  11. #11

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    Quote Originally Posted by HeadphoneAddict View Post
    With the SDA CRS he could wire them conventionally and then just stand the speakers on their sides - Voila! Vertically placed tweeters :p
    Good idea but not as simple as "just wiring them conventionally" 2 tweeters operating at the exact same freq would cause some weird and unatural sounds. Not too mention the fact that setting the CRS vertically would completely defeat the SDA component of the speaker. :)

    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 Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  12. #12

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    Quote Originally Posted by heiney9 View Post
    Good idea but not as simple as "just wiring them conventionally" 2 tweeters operating at the exact same freq would cause some weird and unatural sounds. Not too mention the fact that setting the CRS vertically would completely defeat the SDA component of the speaker. :)

    H9
    So, how does Mark at AV123 do it with their 6 and 9 ribbon tweeter towers, or others with 28 tweeters, etc?

    http://www.hometheaterhifi.com/volum...7-page-06.html

    http://www.hometheaterhifi.com/volum...7-page-10.html

    http://www.hometheaterhifi.com/volum...7-page-13.html

  13. #13

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    Quote Originally Posted by HeadphoneAddict View Post
    So, how does Mark at AV123 do it with their 6 and 9 ribbon tweeter towers, or others with 28 tweeters, etc?

    http://www.hometheaterhifi.com/volum...7-page-06.html

    http://www.hometheaterhifi.com/volum...7-page-10.html

    http://www.hometheaterhifi.com/volum...7-page-13.html
    Not sure how Mark at AV123 does it, but Polk uses a "progressive point source". It's hard to get the desired effect if you just wire the dimensional tweeter regularly in the CRS with (2) tweeters. In SDA's (where the other tweeter isn't a dimensional tweeter) the multiple tweeters each cover a different freq and have a different output level; the resulting sum of all the tweeters equals a single point source.

    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 Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

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    The AV123 speakers are also placed viertically. Not horizontally.

    Makes it much easier to deal with.
    Quote Originally Posted by Timothy Smith View Post
    WOW!

    That's like working your way through Katie Perry in order to get to Rosie O'Donnell.

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    Quote Originally Posted by Joe08867 View Post
    The AV123 speakers are also placed viertically. Not horizontally.

    Makes it much easier to deal with.
    The SDA's with side by side tweeters use (1) for dimensional freq. Other SDA's w/ two tweets use a progressive point source and are vertically mounted. That's how you can tell, horizontally mounted tweets do not use a progressive point source.
    "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 Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  16. #16

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    The SDA's with side by side tweeters use (1) for dimensional freq. Other SDA's w/ two tweets use a progressive point source and are vertically mounted. That's how you can tell, horizontally mounted tweets do not use a progressive point source.
    Heiney, I was replying more to the idea of wiring them together (Point Source) for normal stereo and not as a dimensional driver. And that it would be hard to get them right as they are placed horizontally and not vertically.

    I new polk used one tweeter as dimensional and that they changed this later, probably for alot of the same reasons we have talked about here.

    Thanks for the info though. Always good to get the info out.
    Quote Originally Posted by Timothy Smith View Post
    WOW!

    That's like working your way through Katie Perry in order to get to Rosie O'Donnell.

  17. #17

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    Quote Originally Posted by Joe08867 View Post
    Heiney, I was replying more to the idea of wiring them together (Point Source) for normal stereo and not as a dimensional driver. And that it would be hard to get them right as they are placed horizontally and not vertically.

    I new polk used one tweeter as dimensional and that they changed this later, probably for alot of the same reasons we have talked about here.

    Thanks for the info though. Always good to get the info out.
    No problemo. :) FWIW, I agree even if they were vertically aligned it would be difficult to get it right and side by side (wired normally) would be all but impossible.

    Perhaps the best solution so far is just to disconnect the dimensional tweeter and then see what effect it has on overall sound. Or just keep the 1B's :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 Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  18. #18

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    Quote Originally Posted by Joe08867 View Post
    The AV123 speakers are also placed viertically. Not horizontally.

    Makes it much easier to deal with.
    I was referring to my joking (see smiley) post about

    "With the SDA CRS he could wire them conventionally and then just stand the speakers on their sides - Voila! Vertically placed tweeters "

    Where someone said that wouldn't work either.

  19. #19

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    I thought we were talking about SDA1's. I missed something about CRS's somewhere.

    It's cool I am just dumb sometimes. :D Alright most times.:p
    Quote Originally Posted by Timothy Smith View Post
    WOW!

    That's like working your way through Katie Perry in order to get to Rosie O'Donnell.

  20. #20

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    In my early SDA2's I disconnected the dimensional tweeter, and changed the resistor on the XO board to a 2.7 ohm, and all was good. the original is 4ohms, but using 2 tweeters you need to back them off a bit. With the single tweeter conversion you need to bump the power up just a notch via the resistor change. You could try just disconnecting the dim tweeter, and see how you like it. I think you will feel the mids lacking a bit. The tweeters are crossed over in the mid range frequency (2500hz).
    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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