RTA 12b SDA?
FestYboy
Posts: 3,861
Tried searching before posting this potentially dumb question, but has there ever been an attempt to SDA mod a pair of 12Bs? I've seen 10s go under the knife, and I'd assume 11s would take to it just as well seeing as they are so similar. But I'm more curious about the RTAs.
Comments
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Throw in a set of CRS crossovers. Im running a mw6503 (higher ohm) as the dimensional driver and the SDA "effect" is all there.Don't take experimental gene therapies from known eugenicists.
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Changing the load changes the XO perameters... But the thought did cross my mind.
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Yes, but the dimensional driver will have lower excursion and to me, the mids cleared up a bit at higher volume.Don't take experimental gene therapies from known eugenicists.
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^ and this is in on RTAs? Got any pics?
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No, I did this on my CRS. My point was you might like what you hear.Don't take experimental gene therapies from known eugenicists.
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Ah thanks for the clarification. I'll keep it in mind if I try it.
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Hey Arty
I did it to my 10's and like the results as did Ronnie!
I recently found a set of SDA 2B's which use the same crossovers as my CRS+'s with the TL mod. I already put hurricane **** on them added blackhole hole 5 on back wall in 3x12 strips starting at the bottom of drivers and going up towards top of cabinet.
So i pulled my crossover from my CRS's and stuck them in it an the binding post cup so I could use my Dreadnaught Brother Dave made me and the RDO -198 tweeters instant up grade LOL
I don't have a house to take advantage of the SDA 2B's close to the wall so the CRS which play better slightly out in the room more fits me better. but after rearranging furniture and doing what I could i was able to ROCK-T-House!!!
a buddy at work made me swear a oath the if i sell the 2B's he gets 1st dib's
So if I had some RTA12's (as my buddy does that wants the 2B's when I explained to him they were like his RTA12's which a extra kick called SDA he then made me promise to remember him
I would try it
yes it can be a pain trying to find a place to mount the crossovers and such but it is worth a listen if you ask me! better then a Feista going down a really big hill
2 ch- Polk CRS+ * Vincent SA-31MK Preamp * Vincent Sp-331 Amp * Marantz SA8005 SACD * Project Xperience Classic TT * Sumiko Blue Point #2 MC cartridge
HT - Polk 703's * NAD T-758 * Adcom 5503 * Oppo 103 * Samsung 60" series 8 LCD -
Someone at Vanilla needs their teslacles squidged.hurricane ****
Ken? You there? Can you fix this? -
knuts? ****? nuhts?
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Tried searching before posting this potentially dumb question, but has there ever been an attempt to SDA mod a pair of 12Bs? I've seen 10s go under the knife, and I'd assume 11s would take to it just as well seeing as they are so similar. But I'm more curious about the RTAs.
Tinkering with a pair of Monitor 10s is one thing (I've done it). They're a dime a dozen relatively speaking. RTA-12s are a whole different animal. They are arguably the most accurate, "audiophile" stereo speaker Polk made back then. They were Polk's TOTL stereo pair. I personally would never dream of "Franken-Polking " them.
If you own a pair, they're yours to do with as you please.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
Dave, the only reason I'm even considering it is the fact that I have spare parts AND if I do it right, it would be completely reverseable without damaging the originality of the RTAs. To that, you bring up the one point as to where this hair brained idea came from: they're super accurate. I think if I had a pair of SDA 2s, I'd mod them with RTA components first instead, but I haven't found a pair in a price range I'm willing to pay, yet. -
SDA 2 is not time aligned like RTA is.
If that makes a difference -
@westmassguy
Dave, the only reason I'm even considering it is the fact that I have spare parts AND if I do it right, it would be completely reverseable without damaging the originality of the RTAs. To that, you bring up the one point as to where this hair brained idea came from: they're super accurate. I think if I had a pair of SDA 2s, I'd mod them with RTA components first instead, but I haven't found a pair in a price range I'm willing to pay, yet.
Like I said, if you have a pair, they're yours to do with as you please. No harm, no foul. There's no Polk police that will break down your door, and take them from you.
Keep in mind, the setback for the tweeter/crossover assembly was done for a reason, time alignment, and the inner and outer woofers on the B & C revision, receive different signals. The original RTA-12 is smaller, and doesn't have the woofer signal modifications.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/ -
SDA 2 is not time aligned like RTA is.
If that makes a difference
Right. In my head, I'd remove the tweet from the enclosure and mount it ala the RTA... I imagine it would be easier to do that than mod the 12s, but I don't have a pair of those, yet... -
The RTA-12 would allow you to experiment with tweeter position easily once you grafted in the SDA crossover. I prefer the tweet as close to stereo driver as possible.Don't take experimental gene therapies from known eugenicists.
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As do I, and in our case, a semi horn loaded tweeter would solve alot of issues in that respect. And if you really wanted to keep things in line, an X configuration (4 MW and a semi horn loaded tweeter in the center) would be rather effective. It would act much like a single point system.
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Also when I did it to my 10's it was easy to put them in and take them back out and I did not harm them and/or the crossovers.
2 ch- Polk CRS+ * Vincent SA-31MK Preamp * Vincent Sp-331 Amp * Marantz SA8005 SACD * Project Xperience Classic TT * Sumiko Blue Point #2 MC cartridge
HT - Polk 703's * NAD T-758 * Adcom 5503 * Oppo 103 * Samsung 60" series 8 LCD -
Funny, I had the same thoughts about my 12C's... if you do it I'm interested inhearing about the results!Current Collection: Monitor 4a (Peerless), Monitor 5B (Peerless), Modified Monitor 7b (Peerless), RTA15TL (SL3000), SDA CRS+ (194’s), SDA SRS 2.3TL, R100's, R200’s, R300 🤩
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If you were going to try this I suggest using the low pass crossover layout from a 2b and the matching 6503 and 6511 drivers they use in combination with the stock high pass from the RTA12B's. Who knows? It might just sound great.
"Make a man a fire and he'll be warm for a day. Light
a man on fire and he'll be warm for the rest of his life."
