SDA-SRS, SRS 1.2, SRS 1.2TL, SRS 2.3TL Crossover Design and Progressive Point Source
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I believe Neil @nspindel had a thread
For the SDA1c or SDA SRS 2 for a TL mod. I do not believe it was ever sanctioned by Polk like other mods here. -
I believe it was a TL mod for the 1B which like the 2B it required the additional cap across a resistor.Yamaha RXA1030, Yamaha CD-S2100, Yamaha AS-2200, Bluesound node 2i
Polk SDA2btl highly modded
Polk SDA 1C modded
Polk CS350 LS x2
Kimber 8TC
Sony 55" Bravia
Wish list SVS sub -
RandyCroissant wrote: »I believe it was a TL mod for the 1B which like the 2B it required the additional cap across a resistor.
1b is two board XO and Blade/blade interconnect cable. I do not believe you can do that. It's more that a simple cap. In some models there's also inductor changes.
My SDA1 signature model also had a 5.8uf cap across the resistor from factory it was not TL'able.
Some cannot use the tri-laminate tweeters "properly"
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Agree any of of two tweeter versions have no acceptable TL mod. However I read a thread here on the forum about this and how it can be accomplished not a Polk sanctioned mod thoughYamaha RXA1030, Yamaha CD-S2100, Yamaha AS-2200, Bluesound node 2i
Polk SDA2btl highly modded
Polk SDA 1C modded
Polk CS350 LS x2
Kimber 8TC
Sony 55" Bravia
Wish list SVS sub -
RandyCroissant wrote: »Agree any of of two tweeter versions have no acceptable TL mod. However I read a thread here on the forum about this and how it can be accomplished not a Polk sanctioned mod though
Now that I'm thinking I can't remember if it was @inspiredsports thread or Neils @nspindel , I read it as well. Yes you're correct there was a long one that was very interesting to say the least. -
It was inspiredsport and I had it bookmarked until vanilla came along and messed up the link.RandyCroissant wrote: »Agree any of of two tweeter versions have no acceptable TL mod. However I read a thread here on the forum about this and how it can be accomplished not a Polk sanctioned mod though
Now that I'm thinking I can't remember if it was @inspiredsports thread or Neils @nspindel , I read it as well. Yes you're correct there was a long one that was very interesting to say the least.2-channelBelles 22A Pre, Emotiva XPA-2 Gen 2, Marantz SA8005, Pro-Ject RPM-10 Turntable, Pro-Ject Phono Box DS3B, Polk Audio Legend L800's, AudioQuest Cable throughout. -
Nice 😑
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It was inspiredsport and I had it bookmarked until vanilla came along and messed up the link.RandyCroissant wrote: »Agree any of of two tweeter versions have no acceptable TL mod. However I read a thread here on the forum about this and how it can be accomplished not a Polk sanctioned mod though
Now that I'm thinking I can't remember if it was @inspiredsports thread or Neils @nspindel , I read it as well. Yes you're correct there was a long one that was very interesting to say the least.
Can anyone find that old thread and bump it?Don't take experimental gene therapies from known eugenicists. -
He only did one of the two tweeters. Not a success story.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 -
That's not what I recall reading. They determined you only had to do the 5.8uf shunt cap on the tweeter that received full frequencies, (extrapolated from a Matt Polk conversation). Still can't find the thread to verify.Don't take experimental gene therapies from known eugenicists.
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Looks like I've got some reading to catch up. Thanks Pit.Don't take experimental gene therapies from known eugenicists.
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Seems my memory of that experiment was a bit off. Still not convinced it was a success story though.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 -
Maybe InspiredSports will check in with an update/F1 rebuttal.Don't take experimental gene therapies from known eugenicists.
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The tweeter array is not VOLUME dependent, it's FREQUENCY dependent. The various tweeters are frequency-restricted in a progressive fashion, so if the signal has the appropriate frequencies, the tweeters are active regardless of the volume level.It's my understanding that with the TLs, the top tweeters always produce sound, and with the "progressive array", the second, then third tweeters (and 4th on the 1.2s) produce sound as volume increases.
Experiment, see (hear) what happens.Would changing the order of the tweeters via the wiring harness from bottom-to-top as opposed to the factory top-to-bottom help eliminate the problem of the tweeter array being too high on the 1.2s, or would it do more harm than good?
I don't doubt that this would ideally be done with instrumentation in a specialized acoustic environment. But since that stuff is in short supply, trial-and-error would likely suffice.
For the record, I followed "inspiredsports" lead. He worked on SDA SRS2 blade/blade; I worked on SDA 1Bs. I'm entirely satisfied with the results except that the volume level of the tweeters could be increased. Lowering the resistance of one resistor in each cabinet would do the job. ~1.8 ohms instead of whatever the OEM value is--2.0, or 2.3 ohms, I forget which.
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I did a srs 2 Rd0198 build a loooong time ago and the results were mixed so I never did the mod again, ymmv- Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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The tweeter array is not VOLUME dependent, it's FREQUENCY dependent. The various tweeters are frequency-restricted in a progressive fashion, so if the signal has the appropriate frequencies, the tweeters are active regardless of the volume level.
That is true. In addition, the top tweeter is not always the full frequency tweeter.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 -
I contacted Ken about this several years ago. He was in touch with MP at that time and asked him about it amongst other things. MP said it should not be too difficult to do (I'm paraphrasing), and that he would look into it. That was several years ago, and Ken never heard back.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
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