Legendary Polk SDA II speakers with interconnect cable. Polk’s line of Stereo Dimension Array (SDA) speakers, which were designed to create a more natural stereo sound stage than is possible with conventional forward-facing speaker systems. The SDA technology involves combining two speaker systems in each cabinet of a mirror-image stereo pair. The inner one (nearest to the center of the room), called the “stereo array,” is a normal stereo speaker. The second system, known as the “dimensional array,” is located a few inches to the outside of the stereo array. Each dimensional array is driven by the stereo signal from the opposite speaker in the pair, and the frequency, phase, and amplitude characteristics of its output are modified so that when its sound reaches the ear of the listener, it cancels the sound arriving at that ear from the opposite speaker. The result, in the ideal case, is that each ear hears only the sound from its corresponding speaker, without the “interaural crosstalk,” and consequent spatial distortion, that would otherwise exist. Eliminating interaural crosstalk effectively removes the physical speakers as apparent sound sources. SDA-2 is a superb speaker regardless of its spatial characteristics. Im moving and cannot take them with me because of the size and weight.

Local pickup only!Cosmetically and functionally in fantastic condition, with no issues. Comes with interconnect cable and speaker cables. These sound wonderful! I no longer need them.One Caveat- I am going to Brooklyn, NY in 2 weeks so I could bring with me and deliver on the way. Will need to discuss!

Woofers were pulled from working SDA-1C speaker and are in very good condition and are working properly. Woofers were just treated with 303 protectant. Mounting screws included. Please see pictures for additional detail on condition and ohm readings for both speakers. Speakers will be well packed for shipping and will ship in individually in USPS medium size boxes Woofers sold individually - 2 available

Local pickup only! Cosmetically and functionally in fantastic condition, with no issues. Comes with interconnect cable. These sound wonderful! I need the space, so they need a new caring home. The last photo is specs off of hifiengine.com Local Pickup only!

PAIR of Polk Audio SDA-2 Speaker System Floor Standing Speakers. These are Stereo Dimensional Array speakers, which have attracted quite a following in the Polk aAudio Community. (Check out the blogs.) Includes the cord that connects the two speakers together for wider dimensional, listening through noise canceling technology. The SDA-2 is often modded and updated by those who know how to do it. Owner’s manual is also included. There has been only one owner, and the speakers have been lovingly cared for in a smoke-free and pet-free environment. Since they are almost 40 years old, there is some fading of the cabinet finishes, mostly on the tops, but they still sound great.

PAIR of Polk Audio SDA-2 Speaker System Floor Standing Speakers. These are Stereo Dimensional Array speakers, which have attracted quite a following in the Polk aAudio Community. (Check out the blogs.) Includes the cord that connects the two speakers together for wider dimensional, listening through noise canceling technology. The SDA-2 is often modded and updated by those who know how to do it. Owner’s manual is also included. There has been only one owner, and the speakers have been lovingly cared for in a smoke-free and pet-free environment. Since they are almost 40 years old, there is some fading of the cabinet finishes, mostly on the tops, but they still sound great.

Polk Audio SDA-1 SDA-2 magazine ad. From the October 83 issue of Audio Magazine. It is an original. Not a copy. In good condition. Safely packed, we do include a stiff cardboard insert, the insert and ad wrapped with saran wrap and a Please Do Not Bend sticker on the envelope to help preserve the integrity of the ad.