Looking around the net I found a 20 hz test tone. My speakers, Yorkville Elites play this fine and I can hear it. My Bose is almost there, it's a stretch to hear it at all.

That said I loose my hearing at around 2700 as it cuts off. 3000 hz is never heard by me, so that's out. Actually on a piano the last 12 white notes are impossible to hear.

Some of the black notes on the piano I can't either, they seem to be the top ones.

So at 20HZ my Behringer powered mixer and speaker cabinets that are too heavy to move,work OK. The Bose, not quite. At the top end both can make tones I cannot hear.

John Conley
Musica est vita