How good is your hearing ? And how do you know ?

I heard through the grapevine Lizzie can hear a mouse fart at twenty paces. 

I think she can definitely hear the cogs whirring in your head GK.

At my age it’s cog, singular. 

But it’s a really really BIG complicated CNC machined cog...Plus it chimes on the quarter hour... Only in 'N' Hyperspace of course.

have had tinnitus in my right ear for years....very annoying, along with poor HF hearing in that ear....yet I can still, thankfully hear small differences in music and recordings, as well as any changes I make to my setup. I can't explain it. I guess you just have to know what you're listening for. I'm sure that 20 years ago my hearing was much better, but thankfully I can still appreciate my gear and the music that it plays. When I can no longer do that, I guess I'll post my stuff here for sale and go back to reading books at night :)