Electronics-World-1959-05

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Argos Model DSE -1
KLH Model Six
Stephens' "Stereodot"
Frazier " Stereorama II"
bass that is supposed to be there, so
stereo should have just plain, good
bass.
Some of the earlier small bass units
relied on harmonic generation to give
a "false bass" -like the car radio bass,
but more modern approaches have resulted
in units that do give real bass
from much smaller units than hitherto
was believed possible. Some manufacturers
claim that trying to get big
bass from small speakers is defying
"the laws of physics." I think it would
be more accurate to say that some designs
have found some "loopholes" in
these "laws."
But do satisfy yourself that the unit
you buy does give genuine, clean bass
that is adequate for the room in which
you will play it and working from the
amplifier you will use.
Two Identical Units
So much for the "system" approaches,
some of which come pretty
much "ready- made" while others give
plenty of scope for experimentation.
But another approach that offers wide
appeal for two reasons is of the two -
identical -unit variety.
This may come either as separate
loudspeakers which connect to an
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Fig. 9. Arrangements used In Columbia consoles:
(A) and (B) use 2 full -range speakers;
(C) combines lows in central woofer
and mid -range and highs to external units.
Fig. 10. Basic arrangement used in Ranger -
Lansing "Paragon and "Metregon" units.
I I
ANU W MIOOLE CONNECTS sT
THANT0S CWC "T TO IOTw Mhe[RS
CORNER HORNS FOR LEFT ND RIGHT
Fig. 11. Klipsch's recommended setup, with
2 corner horns and "phantomed" center unit.
Fig. 12. Method of getting good horizontal
distribution and avoiding unnecessary vertical
spread with extended -range units.
44
RADIATION COMIWES IN
HORIZONTAL PLANE
RUT CANCELS M uR
AND DOWN DIRECTIONS
10A5NE0 ARROWS,
MAKER
Columbia
Electro -Voice
Jensen
Klipsch
Stephens
University
MODEL
360,626,637
Stereon
Stereo Director
Heresy
Stereodot
Stereoflex
BRIEF DESCRIPTION
Central unit for mixed lows, part of console;
small side units for stereo highs, above 250
cps; jack arrangement, see text.
Add -on unit consisting of mid -range and
tweeter speakers working above 300 cps. Bass
in both channels handled by low- frequency
speaker system.
Ducted -port enclosure for woofer. Mid -range
and tweeter units are swivel- mounted to permit
varying of directivity.
Corner horns with sealed back enclosure for
center fill, phantom- connected to amplifiers.
Central unit for mixed lows and controlled
mixture of highs for center fill; small side
units for stereo effect, above about 400 cps.
Add -on unit consisting of mid -range and
tweeter speakers working above 150 cps. Bass
in both channels handled by dual voice -
coil woofer.
Table 2. Here are some of the special stereo systems with brief descriptions.
conduct some careful listening tests of
your own.
Stereo Bass
In going over different systems -or
for that matter, individual speakers too
-you will find a further area of conflict
lies in the kind of unit used to
provide bass response. Paul Klipsch
won't hear of anything but a corner
horn, except for the center fill. Other
manufacturers maintain - as almost
anyone would have until a year or so
ago -that a speaker must be big to get
good bass. Edgar Villchur (of Acoustic
Research) says that there is merit
in a low- efficiency and small bass system.
So what kind of bass is good for
stereo? As was explained in Part 1,
pure bass is not materially stereophonic
in any ordinary sized living
room. But music is deficient without
equipment cabinet or with the equipment
included in one ensemble with a
companion speaker to match. In
achieving stereo, both offer similar
prospects. Also some systems come as
a matching set of three which can
stand close together thus simulating
the one -piece system or be spaced farther
out if this is found necessary in a
particular listening room.
Directivity
But we now get into another difference
over which to choose: directional
or diffuse radiating (omnidirectional)
type loudspeakers? On this score most
speaker manufacturers belong to one
school or the other.
The omnidirectional school uses diffuse
radiators so that sound exclusively
from one unit will be identified with it
-wherever you are in the room. Cor-
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ELECTRONICS WORLD