1944 Altec - THE DUPLEX SPEAKER - FIRST TIME IN HISTORY! May 27 Written By Iain Very early Altec duplex speaker ad. Not sure of the first time in history claim but certainly one of the first. 604 = 60 40 coverage.... I am so slow.... 604Altecduplex Iain
1944 Altec - THE DUPLEX SPEAKER - FIRST TIME IN HISTORY! May 27 Written By Iain Very early Altec duplex speaker ad. Not sure of the first time in history claim but certainly one of the first. 604 = 60 40 coverage.... I am so slow.... 604Altecduplex Iain