Are the Polk RTA line-up meant to be run with no toe in similarly to the SDA?
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Okay then explain what he is implying when he says the RTA were derived from the SDA technology? How should I have Interpreted that not knowing much about either of these speakers? I look forward to your answer.
SDA is a passive inter aural crosstalk cancellation scheme. It is employed in SDA speakers. For a lengthier understanding of what it is or entails, there is, literally, decades of discussion. Search and you will find.
RTA employs no such technology.....it’s a conventional floor standing speaker.
Am I speaking Swahili here?
I plan for the future. - F1Nut -
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Yes I was remembering incorrectly. All 4 stereo and all 4 dimensional drivers in SRS receive the same signal. I knew that the tweeters were progressive. All 4 MW drivers in 15TL also receive the same signal. Not sure what (Julian Hirsch?) was referring to for sure but the vertical physical alignment is shared, and the dispersion that occurs from them. He says:
"Polk’s aim was to utilize the same basic line-source configuration as featured in the SDA systems, with just one of the SL3000 tweeters developed for the most recent SDA systems, to create affordable speakers of moderate size whose sound would surpass that of competitively priced systems."
and
"The vertical line array of the four small bass/midrange drivers radiates sound through a wide horizontal angle but focuses it into a narrow vertical angle. This pattern is said to minimize reflections from the floor and ceiling, providing superior imaging without limiting the location of listeners within the room."George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
OFFS.
well, beauty would be in the eye of the beholder, wouldn’t it?
That being said, on the forum here.....SDA’s are discussed more, more highly sought after....but there are those who aren’t fans and feel it’s a gimmick.
All I’m pointing out is they are wildly different.
Up to you to figure out what you like or don’t likeI plan for the future. - F1Nut -
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The original Martin Dynamo? Yes they go surprisingly, sometimes alarmingly deep. I'm on my 2nd used one (power board failure on first). It rarely has a hiccup although there is an alleged issue with yellow (Chinese of course) glue turning brown with age and becoming conductive. Unfortunately they were quite liberal with it all over some of the components, why I don't know...for microphonics?George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
If toeing is wrong I've been doing it wrong for 10 years
. Toe as you pls. Just give em room .. -
Gustard X26 Pro DAC
Belles 21A Pre modded with Mundorf Supreme caps
B&K M200 Sonata monoblocks refreshed and upgraded
Polk SDA 1C's modded / 1000Va Dreadnaught
Wireworld Silver Eclipse IC's and speaker cables
Harman Kardon T65C w/Grado Gold. (Don't laugh. It sounds great!)
There is about a 5% genetic difference between apes and men …but that difference is the difference between throwing your own poo when you are annoyed …and Einstein, Shakespeare and Miss January. by Dr. Sardonicus -
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Very, very simple answer to your query here....
Let your ears decide. If you can't rely on them? Why even bother.
No, to answer your question
Tom~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~ -
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The manual was pretty brief and covered all 3 tower models. Usually they do give some guidance on positioning but not this time.
https://us.v-cdn.net/5021930/uploads/attachments/8/0/7/1/1/40201.pdf
https://www.hifiengine.com/manual_library/polk-audio/rta-15tl.shtmlGeorge / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
Ultimately you are correct, however, some speakers are recommended not to use toe in. It can't be said one way or another with certainty without the setup instructions.
Not really true.
Toe in is a matter of personal taste and choice that involves certain tradeoffs (image specificity vs soundstage width etc etc).......but I can't think of many speakers that have big warning signs DO NOT TOE IN......
SDA is different because of the interaural crosstalk cancellation.....
Oy vey.I plan for the future. - F1Nut -
rock on, y'all.
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To toe or not to toe. Serendipity or incredulity?Don't take experimental gene therapies from known eugenicists.
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"You turn the right speaker in, you turn the right speaker out. You turn the left speaker in, you turn the left speaker out. You do the hokey pokey and you turn yourself around, that's what it's all about!"
Early life lesson. -
There is no SDA tech on any RTAs
WHICH "technology" are we talking about?I think you guys are completely wrong. I think the SDA and RTA absolutely do share similar technology as stated here https://www.hifi-classic.net/review/polk-audio-rta-15tl-87.html
It uses one SDA-equivalent tweeter per cabinet, and the same "diffraction spoiler" as the SDA SRS 3.1TL.
It uses multiple, 6.5" midwoofers like the SDAs.
It uses bassive-radiator design, like the SDAs.
It uses the same vinyl-over-particleboard cabinet construction as the SDAs. Probably with similar bracing and Dacron stuffing inside.
I have no doubt that it's "voiced" similarly to the SDAs and has crossover components of similar quality to the SDAs.
MOST of the "technology" of the SDAs is incorporated into the rest of the Polk lineup of the time.
What it doesn't do is share the opposite-channel, interaural-crosstalk-cancelling tech of the SDAs. That may be the "defining" technology of the SDA speakers, but it's not the only technology those speakers have.
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@15TL The SDA manual states that you don't toe in the speakers.
Can you find in the RTA manual that states this?
Regardless of "shared technology" -
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I gave you the link to the manual about 8 posts up ^. It does not give advice on placement. The advertisements that Polk put in the mags stated that placement was not critical due to the line array "technology" derived from the SRS. I see no reason why toe in would be precluded whatsoever.
Here is the link to the manual again
https://forum.polkaudio.com/home/leaving?allowTrusted=1&target=https://us.v-cdn.net/5021930/uploads/attachments/8/0/7/1/1/40201.pdf
This is the link to a brochure (login required)
https://www.hifiengine.com/manual_library/polk-audio/rta-15tl.shtml
Here are some advertisements from back in the day
George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
Here's a brochure they came out with to explain improvements made to the RTA 8tl and RTA 11tl. It has some interesting info. See attachment.George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
Why did they call the entire line RTA when the 12s were the only ones actually time aligned?afterburnt wrote: »They didn't speak a word of English, they were from South Carolina.
Village Idiot of Club Polk -
Why are we even discussing this any more? The OP stated he doesn't like them and clearly has no interest in trying to make them better with upgrades. END OF SUBJECT! Move on people!Gustard X26 Pro DAC
Belles 21A Pre modded with Mundorf Supreme caps
B&K M200 Sonata monoblocks refreshed and upgraded
Polk SDA 1C's modded / 1000Va Dreadnaught
Wireworld Silver Eclipse IC's and speaker cables
Harman Kardon T65C w/Grado Gold. (Don't laugh. It sounds great!)
There is about a 5% genetic difference between apes and men …but that difference is the difference between throwing your own poo when you are annoyed …and Einstein, Shakespeare and Miss January. by Dr. Sardonicus -
Why did they call the entire line RTA when the 12s were the only ones actually time aligned?
Good question. Marketing Dept running slipshod over Engineering Dept? I haven't found an ad where they spelled it out as Real Time Aligned with any of the other "RTAs" like they did with the 12.George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Onkyo A-8017 integrated
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
No I could not find the manual. Someone else gave me that information and upon testing I found they have far better sound quality and imagining facing forward. Not sure what manufacturer recommends.
I thought I posted this earlier but here it goes. The instructions suggest toe-in but try it both ways to see what you like best. Environment and placement can make a big difference. Having an amp that can drive high current (different from high watts) also makes a big difference with speakers like the RTA-15TL.Stan
Main 2ch:
Polk LSi15 (DB840 upgrade), Parasound: P/LD-1100, HCA-1000A; Denon: DVD-2910, DRM-800A; Benchmark DAC1, Monster HTS3600-MKII, Grado SR-225i; Technics SL-J2, Parasound PPH-100.
HT:
Marantz SR7010, Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S4, CS250, PSW110 , Marantz UD5005, Pioneer PL-530, Panasonic TC-P42S60
Other stuff:
Denon: DRA-835R, AVR-888, DCD-660, DRM-700A, DRR-780; Polk: S8, Monitor 5A, 5B, TSi100, RM7, PSW10 (DXi104 upgrade); Pioneer: CT-6R; Onkyo CP-1046F; Ortofon OM5E, Marantz: PM5004, CD5004, CDR-615; Parasound C/PT-600, HCA-800ii, Sony CDP-650ESD, Technics SA 5070, B&W DM601
https://www.youtube.com/watch?v=xFlh_BWJ-XU
