Prior to beginning to understand how speakers interact with each other & with the acoustic environment around them I thought that in a perfect situation, the perfect speaker would require no EQ.

Knowing that there is no perfect speaker or perfect speaker combination or perfect acoustic situation is vital to being able to accomplish a “best care scenario”.

For the sake of experiment, lets say we own a perfect speaker. A single transducer that can produce 20hz to 20k.

Perfect frequency response.
Perfect impulse response.
Perfect phase across the entire audible range.

Question:

Where?

If you design a speaker to be on the floor, raising it on a speaker stand means that it’s now low end deficient because it was relying on the coupling with the floor. If you design a speaker to be used on a speaker stand, putting it on the floor means it now has excessive low end. If you design a speaker to be listened to in free space, putting it up against a wall will mean that it’s low end changes. A corner? Even more low end. On the floor in a corner? Even more low end.

The solution that comes the furthest so far is a self powered speaker that has presets to compensate for acoustic loading.