about one month ago i bought alessis m1 active mk2.

three days ago i realized that there is a problem with a monitor.
with low frequencies i can hear a buzz on that monitor.
itried and tried again and i am sure that only that one makes that hum, the other one is ok.
it's a problem of the woofer, i guess.

if i softly press with a finger on the edge of the cone it almost disappear.

the problem is that the warranty is applied to products sold to users in the usa only...

what can i do to fix it up?
does someone had a similar problem?