@erik_squires what's the price-point where you would consider something a megaspeaker? You could try going to a dealer that has a good room, or contacting the manufacturer directly to ask if they might allow an audition in their room which has a fair chance of being a megaroom to match their megaspeaker, or see if there is an enthusiast who has both a megaspeaker and megaroom who would be willing to have you over.
I do think a poor room (super echoey, noisy environment, etc.) will make even the best speaker (using contemporary technology) sound poor simply because it will be difficult to discern the sound the same way it is difficult to understand what someone is trying to say to you in a poor environment. Indoor sports arenas being used for musical performances is a great example—even if you have Pavaroti or Netrebko singing in a place like that it will sound horrible.
I do think a poor room (super echoey, noisy environment, etc.) will make even the best speaker (using contemporary technology) sound poor simply because it will be difficult to discern the sound the same way it is difficult to understand what someone is trying to say to you in a poor environment. Indoor sports arenas being used for musical performances is a great example—even if you have Pavaroti or Netrebko singing in a place like that it will sound horrible.