James
Lord of the Erg\o/s
That would be why bass reflex loudspeakers have been banned from my home for the last couple of decades.To give an example, closed box 'speakers with a dry bass alignment and limited low bass are usually perceived as having superior pace and timing.
You likely cannot measure any difference in the speed of sound leaving the speaker but you can measure the effects of the bass alignment and FR.
The Yamaha NS-1000M is PRaT-astic.