Its a small temple, and leans towards orthodox interpretations of the law.
That means, since g-d rested on the Sabbath and made it Holy in the tenth 
commandments, observers can't create anything either.
Since changing an electrical current, is creating something different, you 
can't turn on or turn off an electrical device.  Especially on the alter 
where the service is held, and the Torah is read.
Therefore the room has to be small enough to be filled by a voice with out 
an amplifier.
The use of P.A. systems is decided upon by the Rabbi and congregation.
Their are maybe 100 members in total.

This is small town Judaism here.  Thought you guys might find that 
interesting.  To conduct a service you need ten Jewish men.  If you don't 
have that, people can pray individually, but an organized service can not be 
held.