Fact: Low frequency sounds travel further. Think: fog horn.
And how does <4% Neanderthal DNA make Neanderthals “ ancestors of most of the people in Eurasia and a good many outside” It’s an insignificant amount.
Show me a present day Neanderthal tribe. They’re extinct.
Are you kidding, or what? Since we have Neandertal DNA, they ARE our ancestors. Each of us has 64 great-great-great-great-grandparents, 32 on each side of our family, and yet each of us carry no more than 46 of them (2.17% each) in our DNA. By your odd standard, they aren't ancestors either. Despite the length of time since the last type sample walked the Earth, people still carry DNA identifiable as Neandertal. Snap out of it.
Humans are not fog horns, but think small town fire siren, or for that matter, ambulances, police vehicles, fire trucks -- all those are high pitched. Think human voices in a choir -- very treble.