Nice bow at the end.
As a drummer,
Here is a great test for low frequencies, openness, naturalness; the gent walking out to, starting the motorcycle, and driving off. How good is your low frequency reproduction? Adjust your speaker placement for optimal low frequency clarity, flatness of response verses the mids, highs, the sound stage etc.https://www.youtube.com/watch?v=ncQq3T58bHIcheerssteve