Might try asking at the ML Forum before contacting ML direct for closest service center.

RG

If the speaker is making sound but it's down a couple of db from the other speaker I'd check to see if all of the drivers are working. Is the bass control on both speakers set the same? Is the woofer working? If not check the fuse before assuming the woofer is bad. Before disconnecting anything make sure the amp is off and the speaker has been unplugged for a while.