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  1. #31

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    Quote Originally Posted by ben62670 View Post
    Looking at the specs of the toroid the inductance seems like it would affect the hf. I am guessing that the low DCR (.3ohs roughly)of the windings helps offset the filtering?
    I recall that Polk redesigned the SDA circuit and limited it to a specific band of frequencies below the high frequency crossover point. I don't remember what the SDA signal frequency range is. It's in my notes somewhere.

    Quote Originally Posted by ben62670 View Post
    Looking at the way you wired it I am thinking that if the toroid was a slight step up, or down you may not be able to wire it for gain, or minus of the cancellation signal? I did however notice that there are 4 completely separate windings so I am thinking it may work. I am also rethinking my statement on the center stage collapsing. The stereo drivers would still be receiving full signal.
    Any thoughts?
    Try it and see.:)
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
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  2. #32

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    Quote Originally Posted by DarqueKnight View Post
    I recall that Polk redesigned the SDA circuit and limited it to a specific band of frequencies below the high frequency crossover point. I don't remember what the SDA signal frequency range is. It's in my notes somewhere.
    The SDA signal ranges up to 2-2.5khz leaving out the first gen of coarse.
    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

  3. #33

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    Default Dynamat Extreme Application

    I was looking for a better vibration damping material than the two neoprene rubber pads supplied with the Avel-Lindberg transformer. F1nut suggested I try Dynamat Extreme and offered to send me some. Thanks F1.

    Dynamat Extreme panels were applied to all six sides of the Dreadnought's case, to the top of the transformer retaining ring, and between the transformer and the wood brace block. The brace block is there to provide additional support because the transformer enclosure rests on that side (see figure 23). Per the manufacturer's advice, the transformer's retaining bolt was hand tightened to avoid the possibility of over tightening. Overtightened with a wrench could damage the coil insulation and cause a short.









    The Dynamat Xtreme didn't make a big difference, but the difference wasn't subtle either. I'd compare it to tightening down the very last 1/4 turn on an already tight bolt:

    1. The pace of the music was a little faster.
    2. Bass was a little tighter, heavier, and more defined.

    The larger Dynamat pieces were cut on the underside of a small 2' x 2' wooden drafting table. A drafting t-square was used for a guide and cuts were made with a box cutter. Smaller pieces were cut with a very sharp pair of scissors.
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
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  4. #34

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    Looking good!
    '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."

  5. #35

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    My Polk original AI-1 arrived today. I listened to it for 30 seconds then had to apply the baked potato tweak. I managed to hang in for a little over an hour before I had to go back to the Dreadnought.

    I just wanted one for my treasure chest of SDA artifacts...and to have one for comparison purposes when I decide to mass produce the Dreadnought.






    ----------------------------------------------------------------------------------
    Calm down. Don't get excited. He's just kidding about mass producing that thing.
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
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  6. #36
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    Quote Originally Posted by DarqueKnight View Post
    Calm down. Don't get excited. He's just kidding about mass producing that thing.
    I just cussed you out Doc!:p

  7. #37

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    Transformer shipped on Tuesday,,, should have it in operation by next weekend if all goes as planned,, will be driving 2.3 tl's with mono's,,hopefully.Thanks again DK, for the informative post.
    JC approves....he told me so. (F-1 nut)

  8. #38

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    Quote Originally Posted by hearingimpared View Post
    I just cussed you out Doc!:p
    I've seen your crossover work, I can't see you having a problem building a Dreadnought.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

  9. #39
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    Thanks Bro but Ray's work is perfect.

  10. #40

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    So Face, are you going to build me one? I'll buy you a liter of cola :D

  11. #41

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    If he'll build you one for a liter of cola, I'll give him two liters to build me one too.:)
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
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  12. #42
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    What cheapskates, I'll buy him a couple of cases.

  13. #43

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    Quote Originally Posted by m00npie View Post
    So Face, are you going to build me one? I'll buy you a liter of cola :D
    How about a few litres of Guinness? :D
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche

  14. #44

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    Quote Originally Posted by Face View Post
    How about a few litres of Guinness? :D
    Sold! I just have to get the amps so it would be useful.

  15. #45

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    Here is my latest incarnation of the Avel Isolation Transformer. I am holding out for scraps of 20 oz. copper for the "final" stage.

    A few pictures.
    Attached Thumbnails Attached Thumbnails Click image for larger version

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    I like speakers that are bigger than a small refrigerator but smaller than a big refrigerator:D

  16. #46

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    Eh, I've got some catching up to do.
    '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."

  17. #47

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    Quote Originally Posted by MillerLiteScott View Post
    Here is my latest incarnation of the Avel Isolation Transformer. I am holding out for scraps of 20 oz. copper for the "final" stage.

    A few pictures.
    Looks real nice;) Good work:)
    Quote Originally Posted by F1nut View Post
    Eh, I've got some catching up to do.
    I have a lot of catching up to do:(
    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

  18. #48

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    I'm just seeing this for the first time, and once again am humbled by DK's work! One question I have: if this offers the sonic improvements over using the grounding strap and a straight sda connection by isolating the sda signal from the amp's ground, is there any reason why this application should be limited to non-common ground amps? Or would using a setup like this be applicable in all sda installations (capable of using the AI-1), even with common ground amps where the normal sda connection works just fine?
    Good music, a good source, and good power can make SDA's sing. Tubes make them dance.

  19. #49

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    Quote Originally Posted by nspindel View Post
    ...if this offers the sonic improvements over using the grounding strap and a straight sda connection by isolating the sda signal from the amp's ground, is there any reason why this application should be limited to non-common ground amps?
    People have asked about using an AI-1 with a common ground amp, but I don't recall reading a report from someone who did it. This is on my long list of things to try, but I haven't gotten to it yet.

    I don't know of a reason why an AI-1 couldn't be used with a common ground amp.
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
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  20. #50

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    I'm just wondering if a steroidal AI-1 assembly like you've built would offer sonic improvements in all applications, regardless of whether the amp is common ground or not.
    Good music, a good source, and good power can make SDA's sing. Tubes make them dance.

  21. #51
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    Quote Originally Posted by nspindel View Post
    I'm just wondering if a steroidal AI-1 assembly like you've built would offer sonic improvements in all applications, regardless of whether the amp is common ground or not.
    STEROIDAL . . . that's a good one.:D

  22. #52

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    I was going to say terroidal, but steroidal just sounded so much better :)
    Good music, a good source, and good power can make SDA's sing. Tubes make them dance.

  23. #53

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    Quote Originally Posted by nspindel View Post
    I'm just wondering if a steroidal AI-1 assembly like you've built would offer sonic improvements in all applications, regardless of whether the amp is common ground or not.
    Maybe. Maybe not. I don't know. I would think that taking the SDA signal out of the amplifier's ground path is a good thing, even for a common ground amp.

    Quote Originally Posted by hearingimpared View Post
    STEROIDAL . . . that's a good one.:D
    Compared to the tiny stock AI-1, the Dreadnought is steroidal.;)
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
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  24. #54

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    DarqueNight, any links on where to get the transformer? I asked PartsExpress for a price on the Y236906 since they sell Avel, but it's a special order for them and they're quoting $130.08 plus shipping. Also, do you have a link to where the enclosure can be purchased?

    Thanks...
    Good music, a good source, and good power can make SDA's sing. Tubes make them dance.

  25. #55

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    Avel Lindberg direct,, just call em and they'll take it from there

    I got my case from parts express,,, matter of fact,, I'll be putting mine up FS soon,,as I don't need it,, good luck.
    JC approves....he told me so. (F-1 nut)

  26. #56

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    Quote Originally Posted by nspindel View Post
    DarqueNight, any links on where to get the transformer? I asked PartsExpress for a price on the Y236906 since they sell Avel, but it's a special order for them and they're quoting $130.08 plus shipping. Also, do you have a link to where the enclosure can be purchased?

    Thanks...

    The transformer was ordered directly from Avel-Lindberg (www.avellindberg.com). The enclosure was ordered form Par Metal, Inc. (www.par-metal.com).
    "Polk SDA-SRSs are hopelessly out of date both sonically and technologically... I see no value whatsoever in older SDA speakers."~Audio Asylum Member
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  27. #57

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    Thanks! Been talking to George offline though, I may be grabbing his whole assembly.
    Good music, a good source, and good power can make SDA's sing. Tubes make them dance.

  28. #58
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    Quote Originally Posted by nspindel View Post
    Thanks! Been talking to George offline though, I may be grabbing his whole assembly.
    Isn't that kind of extreme to grab his whole assembly just to get his dreadnought? :D
    SRT For Life; SDA Forever!

    The SRT SEISMIC System:
    Four main satellite speakers, six powered subs, two dedicated for LFE channel, two center speakers for over/under screen placement and three Control Centers. Amaze your friends, terrorize your neighbors, seize the audio bragging rights for your state. Go ahead, buy it; you only go around once.

  29. #59

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    Lol :)
    Good music, a good source, and good power can make SDA's sing. Tubes make them dance.

  30. #60

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    Default Looking for someone to build me a dreadnaught

    Greetings,

    I made a request to DarqueKnight for his assistance in building the dreadnaught or building one for me. He recommended that I contact ben62670, and George Daniels.

    I tried contacting Ben, however, he cannot receive anymore private emails. I have a pair of Polk SDA 2.3s and presently drive them with a Pioneer Amp. However, I have a HT rig with a Cinenova Grande 5 for an AMP. I want to drive my 2.3s using the Cinenova but have no A-1 transformer. Hence I need a Dreadnaught to resolve my problem.

    Ben and/or George, please contact me at kabrown2@cox.net to discuss a build. Thanks for your time and consideration.

    V/R

    Ken Brown II
    kabrown2@cox.net

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