This product is a vintage Polk model and is not available for sale, but it may still be available in some stores as a closeout or used product. The following text is taken from the original sales brochure for this product and does not reflect current availability. If you happen to have any question or concerns about this product, or any other Polk Audio product, feel free to contact our Customer Service Department at 1-800-377-7655 Monday - Friday, 9am - 5:30pm EST
Classic Polk Full Range Floorstanding Loudspeakers
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Polk's Classic Signature Reference Series: The Very Best of the Best
What Makes a Legend Most: The Paradigm Shift of SDA Technology
You're familiar with "stereo," the basic two-channel left-and-right channel separation of audio information. What you probably don't know is that reproducing "stereo" from a pair of loudspeakers is less accurate than it seems. In fact, it can be downright inaccurate. This is the problem that Matthew Polk and the engineers at Polk Audio set out to remedy in the mid-80s, just as the audio industry was transitioning from "boutique" brands, popular with a handful of hobbyists, to more mainstream popularity. It was a time of great innovation, and Polk Audio, already an established innovator, was on the forefront.
The problem with "stereo" was that it didn't really work. You sat in front of a pair of speakers, and your left ear heard stuff and your right ear heard stuff, and both ears heard information from both channels, left-and-right; each ear hearing information from both channels. It's called "interaural crosstalk." Interaural crosstalk occurs when left-channel (left speaker) information is heard by the right ear, and right-channel (right speaker) information is heard by the left ear. You can't avoid it, that's just the nature of sound. But it results in a completely unrealistic and inaccurate reproduction of sound, reducing the soundstage to a narrow "sweet spot," with muddy "stereo separation," and unrealistic "imaging."
To more accurately reproduce sound as it was originally created live, with lifelike imaging and separation, Matthew Polk realized the vital importance of maintaining the integrity of the channel separation. To do it, he had to defeat interaural crosstalk. So Polk Audio engineers designed a complex passive-circuitry crossover network for a new set of multi-driver loudspeakers. It would use patented algorithms and innovative sound-phasing to effortlessly cancel interaural crosstalk between the stereo pair. They called it Stereo Dimensional Array Technology, and it produced "True Stereo," a completely new kind of sound, where the left channel information is delivered to your left ear, while the right channel information is delivered to your right ear, and never the twain shall meet. Each ear hears what it is meant to hear, with full stereo separation, as if the performance you are listening to is live.
SDA Technology changed the sound of home audio loudspeakers. It delivered a dramatic, dynamic, broad, accurate, lifelike soundstage with pinpoint imaging and realistic reproduction. And Polk Audio's flagship SRS Series loudspeakers were built to deliver it at the most extreme, lifelike volume levels. Home audio would never be the same.
Today's Polk Audio Benefits from Yesterday's Innovations
That was then, this is now. We've never stopped innovating. The changing nature of entertainment media (vinyl to CD to digital download) demands changes in reproduction technology. So we've miniaturized, digitized, redesigned, reformulated and re-engineered many of our original, patented groundbreaking technologies to better serve your entertainment needs and desires today. Many of our loudspeaker models still use variations on the original SDA Technology, along with other classic patented audio innovations like Dynamic Balance material tuning and innovative driver array designs, so you can still experience the classic warm, realistic, lifelike Polk Audio sound. Hear the difference a history of audio innovation makes. You'll understand why we're still "The Speaker Specialists."
5th Generation SDA Series, circa 1989-1991
Features the SL3000 Tweeter and the flattest, broadest, most accurate frequency response of any SDA speakers to date.
"Mind-boggling... Astounding... Flabbergasting! The best SDAs yet." - High Fidelity Magazine
"Among the crop of new and innovative speaker systems [at CES], probably the most impressive was the Polk SDA SRS, which shook the walls of the Americana Congress Hotel." - Stereo Review Magazine
"Literally, a new dimension in sound." - Stereo Review Magazine
"They truly represent a breakthrough." - Rolling Stone Magazine
"Breathtaking... a new world of hi-fi listening." - Stereo Buyer's Guide
"True Stereo" with SDA Technology
One of the original breakthrought technologies patented by Polk Audio, SDA Technology allows a pair of loudspeakers to deliver an overwhelmingly wide, realistic soundstage with no interaural crosstalk, revealing the full impact of true stereo separation with pinpoint imaging accuracy. You will find this incredible, paradigm-changing technology in today's Polk Audio products, too.
Line Source Array Technology
The Line Source Array minimizes the damaging effects of unwanted sound reflections by controlling the vertical dispersion midrange frequencies. It's an exclusive Polk Audio engineering design, and eliminates blurred imaging and tonal coloration caused by floor and ceiling reflections of these important midrange frequencies. Line Source Array Technology "opens" the soundstage, reduces the effects of undesired room interactions, and achieves a more realistically-placed audio image, with a wider range of optimum listening positions in any room.
Progressive Point Source Technology
As performance frequencies increase during sound reproduction, the SRS Tweeter array actually adjusts its radiation area, becoming an ideal point source at the very highest of frequencies, eliminating high frequency interactions and reflections between the multiple drivers. Progressive Point Source Technology maintains a Constant Vertical Directivity of the mid and high frequencies, which prevents undesirable "beaming," and delivers astonishingly realistic "you are there" imaging.
Internally Braced Enclosures
The enclosure is an integral part of the design of the SRS Speaker Series. At a time when speakers were becoming more and more popular, many companies opted for the economy of cheap, flimsy materials. Polk Audio knew that the build-quality of the enclosure is just as important to the sound quality of the speaker as the material used to construct the driver cones. SRS Series speakers were constructed of heavy-duty MDF, and internally braced for additional stability and efficiency even at lifelike volume levels. Check the specs: these speakers weighed as much as a 6-year-old child. Reinforced baffles and a unique Low Diffraction Grille design virtually eliminated performance-robbing resonances, for less coloration, more efficient operation, and the most realistic sound reproduction possible. Today, Polk Audio loudspeakers continue this tradition of heavy-duty enclosure construction, producing the same excellent and efficient sound.
Dynamic Balance Material Design Technology
Dynamic Balance is Polk Audio's patented micro-analysis of a speaker's entire electro-acoustic and mechanical system. It was developed to help us select better materials and more efficient geometry when building the SRS Series to meet our extraordinary performance standards. Dynamic Balance analysis allowed us to pinpoint and eliminate performance-robbing resonances right on the actual driver material, long before they might become a part of the finished product. We were able to tune out offending sounds before you hear them! The performance of the Trilaminate Polymer driver material used in the SRS Series far outstripped the more traditional vacuum-formed plastic cones of the time. Using the Dynamic Balance process, the Trilaminate Polymer material was tuned to produce flat, uncolored frequency response. This true transparency revealed a wider dynamic range, with sharper details, and no hint of strain. Every driver and tweeter Polk Audio designs and manufactures today is tuned with the exclusive Dynamic Balance process.
Trilaminate Polymer Mid-Bass Drivers
For the kind of realism and deep bass response that you can actually feel, each SRS model features an array of Polk's exclusive Trilaminate Polymer Midbass Drivers. Designed and engineered in a proprietary process using three complementary materials, SRS Drivers deliver performance far beyond the reaches of conventional speaker drivers. The first laminate material was chosen for its structural strength combined with its light weight. The second laminate is extremely stiff with an unusually high speed of sonic wave transmission. The third laminate boasts a uniquely effective damping property that removes sonic coloration. Combined, these materials contribute to a driver that's light and fast, with low distortion and superior transient response and detail, even at truly astounding volume levels. Supported by a rigid motor structure, with high temperature aluminum voice coils to assure reliability even with extended playing at maximum output, and durable Butyl Rubber Surrounds allowing for more accurate cone movement, many of these drivers have survived since the SRS Series was first introduced and still play perfectly. This kind of material perfection can be found in every current Polk Audio model as well.
Critically Tuned Bass Radiators
The SRS Series Mid-Bass Drivers are acoustically coupled to the speaker's Critically Tuned Bass Radiator. A pair of SRS speakers with 12" Bass Radiators has a low frequency driver system of 178 square inches. This is deep bass that is both emotional and physical, and has been described as thunderous. And yet this is a system designed from the start to be clean and tight, with virtually no distortion. The SRS Series has been found to yield less distortion at 25Hz than many audiophile quality tube amplifiers. SRS Series speakers included "Bass Brace" hardware to anchor your speakers to your floor, for the ultimate in efficient, exhilarating deep bass reproduction. We have gone on to use this extraordinary Bass Radiator technology in the development of our current line of loudspeakers and Powered Subwoofers, proving our company-wide dedication to the deepest, most thrilling, realistically musical bass response possible.
SL 3000 Tweeter
At the time, this was possibly the world's finest 1-inch dome tweeter. In the SRS Series, it set a new standard for flat, extended high frequency response, free of peaks, to beyond 26 kHz and increased power handling capacity with high efficiency. Polk Audio engineers worked with the Johns Hopkins University Center for Non-Destructive Testing, utilized Laser Interferometry Technology, to test a vast number of tweeter designs and materials in their search for high frequency perfection. (Dynamic Balance Tuning Technology was a direct outgrowth of this fundamental audio research.) They developed a revolutionary new dome design that would produce perfect motion without the sonic degradation of standing waves. An exclusive process of "vapor depositing" stainless steel and aluminum on a polyamide surface made the new SL3000 dome stiff enough to push standing wave resonance to beyond audible range (20khz), yet light enough for higher efficiency and superior transient response. Backed by a custom-engineered voice coil former pre-formed to follow the exact contour of the new dome, with a surface contact area 10 times that of a typical voice coil assembly, the SL3000 eliminated the "hinging effect," a major cause of standing waves in contemporary tweeter designs at the time. To facilitate the extreme output expected of the SRS Series, the SL3000 Tweeter is cooled by rare Ultra Low Viscosity (ULV) Magnetic Fluid, nearly as thin as water, which vastly improves this tweeter's power handling capacity without compromising efficiency or the reproduction of imaging detail. The SL3000 makes an audible improvement at frequencies below those produced by previous generations of Polk tweeters, and the elimination of performance-robbing peaks audibly enhanced Midrange reproduction in the SRS Series as well. The accurate performance of every dome tweeter Polk Audio has designed and engineered since the SRS Series has benefitted from this fundamental research.
High Efficiency Amplifier Compatibility
The SRS Series was designed and engineered to be driven well by practically any electronics available at the time, even the most modestly-powered amplifer or receiver. They present an "easy load." We recommend that a high quality amplifier or receiver of at least 50 watts per channel be used for the best performance. (If you're using separate mono amplifiers without a common ground, Polk's AI-1 interface is available separately to ensure a proper connection.) You don't need an expensive high powered audiophile rig to enjoy the warm, clear, realism of the SRS Series.
For even greater dynamic range and lower distortion, the SRS loudspeakers may be connected for Bi-Amplification using the two sets of inputs provided on each loudspeaker. No electronic crossover is necessary. When you use two different amplifiers to reproduce the high and low frequencies separately, SRS loudspeakers achieve their greatest sonic potential.
"Bass-Brace" & Floor Spike Floor-Coupling Hardware Included
To enhance the full impact and dimension of Polk's low frequency performance, SRS Series speakers may be physically coupled to your listening room wall or floor with their specially designed "Bass Brace" hardware or Spiked Feet in place.
|Type||SL3000 trilaminate dome tweeters|
|Diameter||6 1/2" (16.51cm)|
|Type||trilaminate polymer drivers|
|Type||fluid coupled sub bass radiator|
|Total Frequency Response||10Hz-26kHz|
|Upper -3dB Limit||25 kHz|
|Lower -3dB Limit||27 Hz|
|Nominal Impedance||8 ohms|
|Recommended Amplifier Power||50-1000 watts per channel|
|Height||63 1/2" (161.29cm)|
|Width||21 3/4" (55.24cm)|
|Depth||13 1/8" (33.34cm)|
|Product Weight (each)||180 pounds|
|Unit of Measure||each|
|Included Accessories||SDA interconnect cable|
|Speaker Warranty||5 years parts and labor (original purchaser)|
Specifications, dimensions and features subject to change without notice. For more information call us at 1-800-377-7655 (USA and Canada). Outside of North America call +1 (410) 358-3600.
10 reviews with an average of 5Write your own review
by luis d, November 22, 20101 out of 1 people found this review helpful.
bass 100percent mids 100percent tweeters100percent in sound
you need two people to carry,other then that they are perfect
wow these speakers are the bomb,no problem with power handling very loud s peakers. might move and sell speakers email me at firstname.lastname@example.org thank you
by SDA SRS 1.2, July 12, 20020 out of 0 people found this review helpful.
The incredible lifelike soundstage reproduced accurately and faithfully at ANY volume level from the most subtle accapella whisper to a wall shaking rock concert.
The imposing size may be a drawback for some as well as these speakers' thirst for power, but the rewards are well worth it! The TRUE weakness is the fact that these speakers are no longer in production - a REAL loss to the audio world.
It's hard to believe I've had these speakers for over 15 years. It must be psychological, but I'd swear these speakers sound better today than they did that wonderful day in 1987 when an eighteen wheeler pulled up in front of my home with two gigantic boxes containing a pair of walnut SDA SRS 1.2's. Much has been written about the design of the SDA system and whether it really does expand the soundstage beyond the physical width of the speakers. The answer in a nutshell is a definite Yes, especially when auditioning a stereo recording with a great deal of left/right separation (60's rock and pop CD's, for example). The rich vocals of well recorded masters by artists such as Linda Rondstadt/Nelson Riddle and Diana Krall are so rich you can hear them take breaths between notes. I haven't had the pleasure of hearing the TL version, but these "plain" 1.2's are an incredible example of a design by a true dedicated master who obviously was not willing to compromise his product for any reason. After all, they have his own signature on them! These speakers are rated to take up to 1000 watts/channel and I believe they are happiest when the power levels get as close to that as possible. My Carver TFM-45 is rated at 375 wpc/8 ohms and even with a dedicated 20 amp line supply, these speakers can take the Carver's full force without any signs of fatigue - my ears give out LONG before these speakers do! It's rare in life to own a product for over 15 years as richly satisfying and impressive as these giants. A true test of their enduring excellence is proven each time an appreciative visitor pays the owner the ultimate compliment, "Those are the best speakers I've EVER heard!" Thanks Matt! Robbie Curlee Barnwell, SC
by rodney millican, February 3, 20050 out of 0 people found this review helpful.
Open detailed sound. They sound great at low or high volumes.
The only small thing i can say aginst them is you cant sit too far from them or you will loose there great quality of sound.
I bought these giants in 1991 and after 14 years i still love them. I have owned many speakers in my life but these are the best. They have a nice open sound that goes beyond the sides of the speakers like no other i have herd. I have a closet door that is about 7 feet from the left speaker and at times it sounds like there is music coming from in there.
by Ralph Simone, May 10, 20050 out of 0 people found this review helpful.
Everything about these speakers is a strength!
Size (in this case) matters! You need room for these giants!
You know, I've owned these beauties for over 15 years and there still is not another set of speakers I would trade them for. The soundstage is exceptional, with crisp, clean highs and thunderous lows. They are "tri-amped" with a 200 watt B&K mono-block for each speakers low end and a 125 watt per channel stereo B&K power amp for the top ends. They accurately reproduce all kinds of music from rock to jazz to classical and simple ballads. Big band music is a pure joy with these speakers. If you ever get the chance, enjoy!
by Mike Habic, August 11, 20050 out of 0 people found this review helpful.
Unsurpassed clarity. Smooth yet powerful bass response. With the volume up a bit I can hear note for note and word for word a few houses away.
A little big for my small house. Moving them for any reason breaks a sweat.
After my folks moved they gave me their 1.2s. Without a doubt the cleanest, yet powerful set of speakers I have heard. Enhances any music style played through them.
by Rick Coleman, February 15, 20060 out of 0 people found this review helpful.
Seamless, wide soundstage. Deep, rich, effortless bass. I don't need no stinkin' sub!
They don't make them anymore.
Everybody thought I was nuts when i shelled out the big bucks for these nearly 20 years ago. Best sound investment I ever made! While others I know have gone through several sets of speakers because of tired ears, these monsters keep on thumping. I also am running 375watts/ch into 8 ohms. They take all my Soundcraftsmen amp can give!
by Howie, October 6, 20060 out of 0 people found this review helpful.
Full bodied sound! No sub needed! Imaging is awesome!! Highs are great!!!!!!!!!
Are Big!!!!!!!! Need 2 people to move!! Make sure interconnect cable is hooked up.
I just found a pair of these speakers after years of wanting them! I own a pair of SDA-CRS+ and have loved the technolgy. When I hooked these up I could not believe how they sounded! I put Pink Flyod Dark Side on it was like every instrument was jumping out of the wall between the speakers. I could literaly point to the wall at every instrument and vocals. I didn't need to hook a sub up. They handle all of my Conrad-Johnson amp and don't ever break a sweat! If you can find a pair of these get them!!!!!!!
by Vaughn Price, May 7, 20070 out of 0 people found this review helpful.
Iím very disappointed that Polk doesnít make them anymore.
They didnít come with a hand truck
I was fortunate to get these beauties from a friend who purchased some new $5000.00 speakers from another company. We did an ďAĒ ďBĒ comparison and neither of us could tell the difference, except his new speakers had a little too much base. After he reduced the boost volume control (inconvenient), his new speakers sounded about as good as the Polks. I know the speakers are big, but are they great!! Please, Please look into Polk before spending a significant amount of money on competitorís products. My biggest advice is DO not waste you money on Bose. Bose is a TV gimmick. Just as a note, Iím using the Yamaha RXV-1700 in Bi-Amp mode. V. Price Mesa, AZ
by Rickey Price, December 21, 20070 out of 0 people found this review helpful.
brillant highs and massive bass. No sub woofer required.
Takes two to move them around. Very heavy!!!
I brought my SDA 1.2's in 1991 and have been in love with them every since. The clarity of these babies are outstanding. I only wish they still made them because everyone should be able to enjoy them as much as I. I have replaced a couple tweeters and one midrange speaker but that was due to my son over driving the amp into distortion causing a problem. Excellent product.
by Rob, March 16, 20080 out of 0 people found this review helpful.
I bought these new in March 1990; what can I say that has not been said. They are the best. I listen to music in great detail, and anyone who has heard these in my audio room love them. I have two NAD 218THX in mono mode for the low freq and one NAD 218THX for the high end, plenty of power and head room. Wit new technology I sometimes drift to think I need new speakers, but I cannot part with these dream boxes. I have moved them many times, and are in mint condition.
This product is considered a "Recent" or "Vintage" Polk Audio model. It is not a part of our current product lineup. It may still be available in some stores as a "close out" or "used" product. Information provided here about this product may not reflect current realities and does not imply availability. If you happen to have a question or concern about this product, contact our Customer Service Department at 1-800-377-7655 M-F 9am - 5:30pm EST. Chances are we remember it.
SDA SRS1.2TL Media
SDA SRS1.2TL Literature
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