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  1. #1

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    Default Polk SDA2s and dimensional tweeters

    Hi, I have had Polk SDA 1s,1Cs and 2B TLs . I recently sold the 2B TLs and for some reason a month later grabbed some beatup SDA 2s with the SL 2000s side by side I was thinking i could put the drivers in my RTA 12s. Anyway I listened to them and they sound good maybe slightly bright. but not harsh at all.. I then disconnected the outside tweere and now they sound really nice and balanced. In fact they sound alittle more full then the 2Bs did with a better midrange . Then again there are 2 stereo drivers verses 1 in the 2B

    I also noticed something else. With the dimensional tweers hooked up I played the 3rd song on Jackson Brown's Running on Empty and JB is talking to a bandmate about Mozart and the band member is righ in front which is not the way any other speaker does it. He is usualy way to the right. When I disconnected the dimensional tweeters he moved out to the right like normal and yes the outside 6.5 dimensional speaker was working. I noticed the same thing on Bob Siegers last track on Against The Wind. Back up singers at the end of the song , first to the right then left then right then left. With the dimensional tweeters hoked up it did not do that.

    Point is they seem to sound way better and more balanced with the outside tweeters disconnected and as a whole seem slightly more filled in in the midrange then the 2B.

    Not that it really matters but did Polk ever come out and say discconnect the outside tweeters?
    Last edited by geppy1; 04-29-2014 at 09:43 PM.

  2. #2

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    i think that is a standard thing to do...seems i've heard it before...
    NAD 2100 - NAD 1020 - Project Debut Carbon with speed box S
    Frankin Polk Monitor 10b-2A - Blue Jeans IC's - (living room)

    Marantz 1060 - Infinity RSe - I-job (garage/mancave)

  3. #3

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    The 3nd generation SDAs did away with the side by side tweeter arrangement. It was determined that the dimensional tweeter detracted from the sound quality with some recordings, as you've discovered. I doubt Polk would recommend disconnecting the tweeter, but most do. I rebuilt a pair of 2s a few months ago, and with the new RDO tweeters, the held their own against my 2ATLs. The 2nd stereo driver is called a bass driver. It crosses over very low. It's purpose was to make up for the loss of bass caused by the dimensional woofer being out of phase. This was later corrected with the "full compliment sub-base drive circuit" starting with the 3rd generation.
    Home Theater/2 Channel:
    Front: SDA-2ATL http://www.polkaudio.com/forums/show...ished...Almost
    Center: Custom http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat, H-Nuts, BH5
    Pioneer Elite VSX-72TXV, Carver PM-350, SVS PB2-Plus Subwoofer


    www.dhsspeakerservice.com

  4. #4

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    One of the first mods I did on my original CRSs was to disconnect the dimensional tweeters and replace the stereo tweeters with RDO-194s. It made a huge difference. I've since done the hurricane nut, armaflex, dynamat, and polyswitch mods. A little over $100 in mods and a little elbow grease has taken these things several wrungs up the ladder. I'll probably redo the crossovers one day, but they sound so good I'm not in any rush to do so.

  5. #5

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    You could also pad the tweeter with a 1 or 2 ohm resistor to tone it down a bit rather than completely unhooking it. I did that to the dimensional tweeters on my CRS's and it helped with the spacey sound.
    There's something about completely unhooking a driver that just didn't seem like the right thing to do to me.
    main set up; modded polk 1.2tl's, recapped mcintosh mc2500, restored yamaha c4, clearaudio emotion, nano +beta woodbody, restored sansui tu9900, sony dvp 9000es, def tech pf18 sub, dedicated listening building

  6. #6

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    I wonder what the effect would be to run 2 stereo tweeters out of the stereo side of the crossover?

  7. #7

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    Quote Originally Posted by pitdogg2 View Post
    I wonder what the effect would be to run 2 stereo tweeters out of the stereo side of the crossover?
    Very hot top end. The dimensional tweeter is at a reduced level, and out of phase
    Home Theater/2 Channel:
    Front: SDA-2ATL http://www.polkaudio.com/forums/show...ished...Almost
    Center: Custom http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat, H-Nuts, BH5
    Pioneer Elite VSX-72TXV, Carver PM-350, SVS PB2-Plus Subwoofer


    www.dhsspeakerservice.com

  8. #8

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    yes i understand that but with the appropriate resisters I'd think you could tame that.

  9. #9

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    Yeah, but then you'd have two different point sources 12" apart. You'll loss imaging, some detail, and lobing, comb filtering may be a problem
    Home Theater/2 Channel:
    Front: SDA-2ATL http://www.polkaudio.com/forums/show...ished...Almost
    Center: Custom http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat, H-Nuts, BH5
    Pioneer Elite VSX-72TXV, Carver PM-350, SVS PB2-Plus Subwoofer


    www.dhsspeakerservice.com

  10. #10

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    Quote Originally Posted by westmassguy View Post
    Yeah, but then you'd have two different point sources 12" apart. You'll loss imaging, some detail, and lobing, comb filtering may be a problem
    gotcha like old Sansui's or Kenwood speakers that had drivers all over the place with many tweeters and a super tweeter.:)

  11. #11

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    What I do is either paint the old SL2000 satin black, or if I have a defective pair of SL2500s, I'll put those in, for aesthetics, to match the RDO-194s
    Home Theater/2 Channel:
    Front: SDA-2ATL http://www.polkaudio.com/forums/show...ished...Almost
    Center: Custom http://www.polkaudio.com/forums/show...hannel-Project
    Surrounds & Rears: Custom http://www.polkaudio.com/forums/show...rround-Project
    Sonicaps, Mills, RDO-194s-198s, Dynamat, H-Nuts, BH5
    Pioneer Elite VSX-72TXV, Carver PM-350, SVS PB2-Plus Subwoofer


    www.dhsspeakerservice.com

  12. #12

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    I was in the biz back in the day and even remember at that time talk of disconnecting them What i find strange is the shift of people onstage Another thing on X over points Later units had the 6.5s coveing 50-2000. These cover 50 to 2500. Less load on the tweeter and i think that makes a difference Not a big difference but it is in the critcal midrange.//vocal area. One of the reasons I really like 10s very open midrange with the 6.5s covering 60 to 3000 and the 10 inch taking care of the low bass and the tweeter just the very top.

  13. #13

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    [QUOTE=geppy1;2043014 One of the reasons I really like 10s very open midrange with the 6.5s covering 60 to 3000 and the 10 inch taking care of the low bass and the tweeter just the very top.[/QUOTE]

    then you would really like my frankin 10b-2A's
    NAD 2100 - NAD 1020 - Project Debut Carbon with speed box S
    Frankin Polk Monitor 10b-2A - Blue Jeans IC's - (living room)

    Marantz 1060 - Infinity RSe - I-job (garage/mancave)

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