Frequency response is easy to measure but it’s only a small part of the picture. If we only cared about frequency response, we would be able to EQ out the diffe

Frequency response is easy to measure but it’s only a small part of the picture. If we only cared about frequency response, we would be able to EQ out the differences between speakers. For the record, we can’t do that. Different speakers have different performance off-axis, different time domain response, and that’s not considering minor effects like distortion. The off-axis response is important because people don’t sit exactly in the “sweet spot” on-axis, and because the off-axis response is heard indirectly after it reflects off surfaces in the room. There’s a lot of science here and on-axis frequency response is only one thing people measure when designing speaker systems.