👀 🔊 #50YearsOfPolk Throwback to 1985-1990 as a college upstart company begins to shake up the world of American hi-fi. a) 1985, Stereo Dimensional Array (SDA) technology is born, one of Polk’s most important innovations to perfecting the soundstage; b) 1986, Polk issues first IPO on NASDAQ, four founders: Sandy Gross, Craig Georgi, Matt Polk, George Klopfer; c) 1990, RTA-15TL deep tower achieves outstanding imaging and low coloration. #PolkAudio #GreatSoundForAll #ThrowbackThursday #TBT #HomeAudio #Speakers