"They were small boxes mounted on a pair of stands in what looked like a fairly small room." - I do not have stand mounted speakers.
"If you want perfect sound you must have 20hz to 20khz reproduction." - There is no such thing as "perfect sound", it is subjective.
"You have a lot to learn." - no doubt, however it won’t be from you, I listen to the ones that know what they are talking about.