Evening star., 1924-06-27
How to Choose Your Loudspeaker-
Part 2.

Part 2.
one of the most important re-
quirements OF loudspeaker is that it
De capable of reproducing the re-
ceWed programs with the sufficient
volume to be heard over the desired
area
This area may be the confines of a
small room or it may be a large
auditorium. Then, again, the sound
required may be just loud enough to
be heard comfortably in all parts of
room under ordinary conditions, or
1t may be required to produce sound
loud enough to be heard above other
noises In the room, as. for instance,
linen Tnen oance music loud enough to
oance to is required.
For ordinary listening in, in an
average room, it is neither necessary
nor desirable that the programs be
reproduced too loudly. A good way
to judge whether the speech or music
is too weak or too loud is to note
whether 1t Is weaker or louder than
the tone which woulds be used by a
speaker or singer in that room.
Better tone and more pleasing ex-
preston is obtained when the radio
equipment and loudspeaker are not
strained by forcing them to give
greater volume than the equipment
VIII handle properly or that the small
introducing reverberation effects.
The selection of the proper set is
dependent on the loudspeaker you are
gong to use or vice versa. Usually,
however, odd as it may seem, it is
pest to select your loudspeaker first
and then buy a set to match the
speaker
The reason for this is very simple.
Best results are obtained only when
the very best type of speaker is used.
The better the ioudspeaker, the less
powerful the set required to give
good results.
Volume on One Tube.
Using the high grade loudspeakers
of the electrodynamic type in which
the permanent magnet of the ordi-
nary receiver type. is replaced by an
electromagnet and where the plate
or voice currents of the receiver flow
through small coil placed in the
HELD or the electromagnetic, signals of
pleasing volume can be obtained from
local stations on single tube set. If
good aerial is used and the set is
properly constructed the one-tube set
is all that will be required for loud
speaker operation on stations within
radius of 100 miles, although | have
set to receive programs loud enough
to be heard ten to twenty feet from
the loudspeaker from stations up to
700 miles distant.
If the set is properly constructed
no more than two tubes need be used
Nor local broadcasting with such a
loudspeaker. Three-tu sets of
the regeneratire type with two
stages of amplification used with a
properly constructed, efficient aerial
system will reproduce programs with
good volume up to 1000 miles under
ordinary conditions.
On local stations, and by local sta
tions / mean those within a radius of
100 miles, the received programs. US
ing detector and two stages. should
be loud enough to be uncomforta BILE
for ordinary listening-in and loud
enough to provide dance music.
These loudspeakers are the type
which are listed at from $35 to $40.
but can usually be obtained at most
radio stores for from $25 to $35.
The next best type of loudspeaker
is that which employs special re-
ceiver for loudspeaker work These
usually take the form of ruggedly
constructed phones units using a
permanent magnet, but with the dia-
phragm constructed of mica and