I'm with you on hearing frequencies, but I definitely notice when a channel is out. Although some material fools me and makes me think the speaker is not working.
The USB connection is not as bad as a friend. She called me to tell me her computer isn't working. She spent the whole weekend trying to get it to work. When I went to her house, I found the USB cable was plugged into her ethernet port. Needless to say her face turned red with embarrassment.
That loudness button can make a difference.

)
It's never too late to sneak out and do the tricycle thing.
I certainly notice a difference with the crossover at different settings. I hope outlaw takes it implements it because other than that, I have no complaints.