I have a close friend who worked at a store in Omaha during the late-70's that was selling GAS equipment along with Phase Linear. There were always the Sheffield dierct-to-disc records, as well as Manheim Steamroller. But the one that got the most mileage was the opening to Close Encounters Of The Third Kind. They were demonstrating the Phase Linear Andromeda speaker system that used the dual down firing subwoofer. The slow build up to the ascending climax and "bass whomp" that quickly dissipated left everyone speechless after having been overcome by the pants-flapping low end and the physicality of the what they just experienced.
To all that worked in audio salons.
What albums or CDs did you have on hand to demo equipment? Was it popular music or some obscure recordings that were well engineered. Im trying to find a pattern here. In the 70's I saw a lot of Dire Straits, Rikki Lee Jones and Al Dimiola on hand at dealerships. Was there any recordings that would be the one that helped sell the equipment? An old faithful or reliable.