Xoom 2 ME speakers stopped working
No. Motorola really did a shitty job of patching the ICS rom for the Xoom2 ME. the IR blaster didn't work for a couple months, and this speaker bug is indeed software.

There is an app by Wyrm on the Play Store that fix some of the speakers issues:

https://play.google.com/store/apps/details?id=wms.xoom2mespeakersfix

https://play.google.com/store/apps/details?id=wms.xoom2mespeakersfixfree

It needs root. If your problem is fixed by the app, send some dough the dev's way by buying the donationware paid version.

Also thanks to the team behind the http://xoom2me.blogspot.com.br/ blog for the savior post.