Polk Audio SDA-1 Classic "Big Boy" System

Polk Audio was founded in Baltimore in 1972 by Johns Hopkins University graduates Matthew Polk, George Klopfer, and Sandy Gross.

The Early Years (1972–1985)Origins: Started with $200 in capital, initially building public address systems for local bluegrass and fiddler conventions.

Breakthrough: Released the Monitor 7 in 1974, establishing the brand's reputation for high-end sound at accessible prices.

Innovation: Became the first speaker manufacturer to use laser interferometry in 1986 to measure and refine speaker performance.

Expansion and Public Trading (1986–1999) IPO: Went public in 1986 with an initial public offering listed on NASDAQ. Polk Audio restructured through the 1990s, shifting manufacturing and returning to private ownership in 1999

Among the companies greatest success stories was the SDA line of Monitors and Floor-standers. One will experience a truly immersive, room-filling sound with the legendary Polk Audio SDA 1 speakers. These iconic floorstanders feature Polk’s patented Stereo Dimensional Array (SDA) technology, designed to eliminate interaural crosstalk and create an expansive, three-dimensional soundstage that extends beyond the physical placement of the speakers. The SDA 1 delivers remarkable depth and imaging, powered by dual midrange drivers, a dimensional array driver, and a smooth, detailed tweeter per cabinet. Built during the golden era of American hi-fi, these speakers combine craftsmanship, clarity, and musical warmth, making them sought after by collectors and audiophiles alike. For this particular set, out tech team cleaned and detailed the cabinets, drivers inspected and tested for accurate response & they play on-point! SDA interconnect verified and all in all, this is a exemplary set of totally iconic Polk big floor-standers.

Important Stuff:

Type: Stereo Dimensional Array Floorstanding Speakers (Pair)
Frequency Response: 20 Hz – 26 kHz
Impedance: 6 ohms nominal
Sensitivity: 90 dB
Recommended Amplifier Power: 20 – 300 watts per channel
Drivers (per cabinet): 1 × 1" Dome Tweeter, 2 × 6.5" Midrange Drivers, 1 × 12" Passive Radiator, 1 × SDA Dimensional Array Driver
Crossover: SDA Interconnect cable required between speakers for dimensional effect
Connections: 5-way binding posts + SDA interconnect socket
Enclosure Type: Passive radiator, floorstanding
DIMENSIONS: 144" × 16" × 12"  (W × H × D) - Weight: 75 lbs

Come have a listen to these Big Boy Polks here at the Andover shop, their performance is pure magic.

Polk Audio SDA-1 Tower Speaker System: $1499.00 plus shipping and sales tax when applicable.

* These need to be freight shipped, delivered by our own regional currier SVC or of course, local pick up. Check with us about these options.