Perhaps "acousticians" & "audiophiles" are at the opposing end of the 70's Hi-Fi nuts but amongst that crowd were genuine but less savy everyday people who, for the first time, had to run the gauntlet of the high street Hi-Fi shops, run by spotty faced, fascists with only one aim, that being to humiliate the poor innocent sod whilst relieving them of their hard earned money. Such stores as Lasky's comes high on the list.
And the sketch by the "Not The Nine O'Clock News" team caught that perfectly.
Full Sketch on YouTube
https://youtu.be/DvswW6M7bMo