You would think that the easiest part of the setup would be
the speaker, and most of the time you would be correct. Most
modern sets,
be they base station, mobile, or HH come with internal speakers and
you don't have to worry. Older P.M.R. sets often came with an external
speaker which was permanently connected to the set or had a
specialised plug. For the purpose of this section, class this as
being an internal speaker.
However, if you do not have an internal
speaker, or want to connect headphones, an external speaker or
whatever takes your fancy, you need to make sure that what you are
plugging in is okay for that set. It is possible to damage the
output chip of the radio, requiring expensive repairs if you
connect the wrong type of speaker. Generally, the only two things
to worry about and the resistance and the size of the speaker - the
one usually being related to the other. Larger speakers having a
higher resistance can put an excessive load on the output chip and
overload it.