Thanks guys. I'm using a Tyros 2. I notice mostly if there is a triangle, high pitched ride or other high pitched percussion sound. It's most noticible with the "rumba/soca" multi pad.

My keyboard and vocals go through a Mackie 808M mixer and the mixer goes into the Bose.

If I turn the keyboard down a bit the "tick" sound will go away. Maybe I'm pushing the Bose too hard?

Bose volume is 12 O clock, Makie mixer master volume is also around 12"o clock. The keyboard volume is between 1" o clock to sometimes full. The tick starts coming around 3 o' clock.

If the speaker is indeed blown, wouldn't it sound bad at any volume?