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 Loudspeakers
The Genius of Matthew Polk Redefines
This 3rd Generation of SDA Loudspeakers incorporated many of the advances in SDA technology pioneered in the Signature Edition SRS and SRS2, including a full complement Sub-Bass Drive, Time Compensated Phase Coherent Driver Alignment and Bandwidth-optimized Dimensional Signal technology.
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."
3rd Generation SDA Series, circa 1986-1987
Features the SL2000 Tweeter
"Spectacular! The result is always better than what can be achieved by conventional speakers." - Stereo Review Magazine
"Astounding! We have yet to hear any stereo program that doesn't benefit." - High Fidelity Magazine
"Superb! SDA has the ability to make your favorite speakers sound second rate!" -- Stereo Review 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 Planar Bass Radiators
The SRS Series Mid-Bass Drivers are acoustically coupled to the speaker's Critically Tuned Planar Bass Radiator. A pair of SRS speakers with 15" Bass Radiators has a low frequency driver system of over 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 2000 Silver Coil Dome Tweeter
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 dome design that would produce near-perfect motion without the sonic degradation of standing waves. Cooled by Ultra Low Viscosity (ULV) Magnetic Fluid, the SL2000 delivers astounding details and pinpoint imaging, without no fatigue, even at constantly tremendous volume levels. 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||Polk SL 2000 silver coil dome tweeters|
|Diameter||6 1/2" (16.51cm)|
|Type||tri-laminate polymer bass-midrange drivers|
|Maximum SPL||120 dB|
|Total Frequency Response||14Hz - 26000Hz|
|Nominal Impedance||4 ohms|
|Recommended Amplifier Power||10-500 watts per channel|
|Height||43 1/2" (110.49cm)|
|Product Weight (each)||85 pounds|
|Unit of Measure||each|
|Total Shipping Weight||85.00 pounds|
|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 Carlton Simpson, April 7, 20068 out of 8 people found this review helpful.
That legendary SDA soundstage!I have come back for more again and again.
(For the SDA-1B's)The impedence dips too low for some lesser amps to drive.(for the SDA-1B's,CRS+'s and 1C's without the AI-1 interface cable)the need for a common grounded amp.
I thought about giving these a lower overall rating.Then i thought about 1)How i REFUSE to replace them with anything other than SDA's and 2)How i have owned three pairs of SDA's over the years.I owned a pair of SDA-1B's back in the late eighties.I also owned a pair of SDA-CRS+.I currently own a pair of SDA-1C's.That alone should tell you how much i love these speakers!!Try the new RD-0194 silk dome replacements for the SL-2000 polyamide tweeters.You WON'T regret it!
by Tom Doppke, November 28, 20053 out of 3 people found this review helpful.
Untouchable sound reproduction, True stereo, best value for the price.
SDA is no longer available.
I purchased my SDA1B's in the early 90's and have yet to find any speakers that come close to the amazing sound that these provide. I cannot understand why they would discontinue the SDA line. Upgrading my system to A/V 6.1, I have kept the 1B's as my main front speakers, and added smaller Polks for the other positions to maintain the true listening experience that only Polk can provide.
by Bill Tweed, July 16, 20083 out of 3 people found this review helpful.
1.Wide sweet spot with SDA. 2. Honest bass response down to the high 20's. 3. Smoothness top to bottom. 4. High output if your amp has enough power (tweeters fuse protected).
Yes, they're big but that's what allows the deep bass response (there's no free lunch). A few modern designs can surpass them in detail,openness and air - for a lot more $!
I have the original SDA-2 speakers which I bought in 1984. They still sound wonderful! Very few speakers today can match the bass response or the overall smoothness from top to bottom. They really like a high current/high power amp but I drove them very well with a 70 wpc Yamaha receiver. The SDA imaging is unlike anything else and really expands the sweet spot. Very musical and never fatiguing. From Abba to ZZ Top - it's all good!
by Kurt Heiden, October 25, 20052 out of 2 people found this review helpful.
Patented technology makes for the finest soundstage and separation I've heard in a floor standing speaker. Substantial power handling and lots of drivers for clarity at all volumes.
Heavy speakers with large footprint and the grills are starting to bend slightly after 20 yrs. Lack of a variety of colors or veneers upon original release.
I bought my SDA-1C speakers in 1987. In 2000 I thought it might be time to replace them with something thinner, and more economical in terms of floor space. I began a quest of listening to all sorts of new systems to replace my nearly 20 yr. old speakers. What I found was that nothing compares to these things. Other speakers that I auditioned were often missing the amazingly full sounding mid-range that the SDA series provided. In fact, the SDA-1C is covers the full range from low to high so well that I couldn't find anything that I liked better. Polk's patented crosstalk cancellation technology is no longer found anywhere, and simply can't be recreated with other speakers. My quest ended with my decision to keep these speakers as the heart of my entertainment system. I think they'll have to bury me with my SDA-1Cs because I can't bring myself to get rid of them (They'll need a pretty big coffin though)!
by Larry F., September 8, 20051 out of 1 people found this review helpful.
There was no section for sda-2b's so here goes. i have just got my 2b's out of storage, set them up, and have been listening for about a month now. originally purchased in 1990, i forgot how great they sound. i can't say enough about them here so i won't. to suffice, i will say this. if you EVER get a chance to purchase a set of sda's, get them. i replaced my ls 90's with them and sold the 90's. i promise you will not be disappointed. 'nuff said!
by Roy, May 16, 20061 out of 1 people found this review helpful.
Unbelievable Stereo Soundstage. Sounds routinley come from way out of teh narrow space between the speakers. Precise Imaging. You can almost point to the cymbals, or guitar.
Keeping them up. Mine are 20 plus years old and have needed some repairs. I would like to get a new grills since my cat indoctrinate one of them with claws. They do require a large amp since there is a large impedance change in the frequency range.
I ahve SDA2s and have had them for over 20 years. They are without a doubt the bets stereo speakers I ahve ever owned. Great sound
by Thomas P, April 25, 20101 out of 1 people found this review helpful.
Almost everything; they're very musical and are of course SDA's.
A touch on the big side (takes 2 people to carry safely and setup). Very difficult to find pre-SDA-1C's (original SDA-1's, 1A's, and 1B's).
Since there's no section for original SDA-1's, I guess this is the next closest. Fantastic speakers; you'll be impressed. I found the SRS1.2TL's are better for larger rooms, so if you live in a smaller house, you're better off with speakers that fit the space. SDA-1's fit my space quite well. They're impressive loudspeakers to say the least.
by Dave G, August 27, 20131 out of 1 people found this review helpful.
Absolutely breathtaking sound stage, detail, and Bass with a strong amp.
They like clean high end power, It doesn't have to be allot, 40wpc will suffice. But It has to be an amp that's comfortable driving low ohms. Of course you'll need some more power if you want to stretch there legs.
I have a set of 2b's that I ended up getting as part of a lot to get another set of speakers that I really wanted. Well, that was one of the luckiest buys I ever made. These things are amazing with the right amp, and have won over my heart, and earned front stage in my high end modern rig. The other speakers have been serving well in an older vintage system. Anyone who doesn't love these, hasn't heard them with the right amp.
by Steeve JOHNSTON, March 12, 20060 out of 1 people found this review helpful.
incredible sound and precision! lond life, better electronics filter and quality speaker!
both side distached, and my left channel turn off when speaker full loaded.
Sorry! I speak in french because my english is no good! J'ai acheté mes SDA1 B en octobre 1989. Je les ai transportées partout, jusqu'à Nouméa! Ceux sont des enceintes extraordinaires! le son est limpide avec une présence permanente. Au debut je les utilisais avec un ensemble ampli yamaha CX 830/MX 830. C'était parfait! Maintenant elles me servent en enceintes principales avec mon yamaha RXV2500. Je n'ai pas besoin d'appoint subwoofer, les basses passives sont excellentes. Merçi pour toutes les sensations qu'elles me donnent et j'espère encore pendant de nombreuses années! Thank you Polk!
by Reggie Boyd,ca, April 14, 20070 out of 0 people found this review helpful.
Great sound stage side to side and back to front. Solid mid's and bass articulation
The high end could have more sing but not much more
I have had my sda-1bs for 22yrs thay still sound great one of the best buys for the money ever....
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.
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