Meridian Audio 501 - Manual (Page 37)

Setting up the Control
Unit
T
his chapter explains how to install the 501/501V Control Unit. It
describes what you should find when you unpack the control unit, how you
should connect it to your other audio equipment, and the siting
constraints.
Before you begin installation, you should ensure that your control unit is
the correct voltage for your local AC supply. If it is not, do not try to install
the control unit, and contact your dealer.
You should not make any connections to the control unit or to any other
component in your system whilst the AC power supply is connected and
switched on.