Disklavier

Holly,

The reason I recommend a UPS as opposed to surge protection is that a 
lightening strike or strong electrical surge may knock out a UPS, but I 
have never had even a lightening strike get passed a UPS and damage 
equipment that has been plugged into it.  The battery in the UPS acts as 
a buffer or sponge for even very strong electrical surges.  A UPS is 
inexpensive compared to a Yamaha digital piano!

A few years ago we had a lightening strike an antennae outside our house 
and come into our home's electrical circuits.  Everything that we had on 
a UPS (all four of our computers, audio, and video equipment) survived 
without any damage.  All such equipment plugged into surge suppressers 
or with no protection, had to be replaced.  It was  a powerful lesson 
that I have not forgotten.

Tom