Electro-Voice Stereon 100 & 300 Data Sheet

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Electro-Voice Stereon 100 & 300 Data Sheet | Manualzz
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STEREONS ‘оо
INTRODUCTION
The Electro-Voice STEREONS are speaker systems of a new
kind, designed to solve space problems encountered in re-
producing stereophonic sound. These simple, inexpensive
units are designed to match specific full-range systems, i.e.:
STEREON 100 LEYTON, ESQUIRE
STEREON 300 REGAL 300, ROYAL 400
They are offered in two models only for the sake of matching
sounds with their complementary full-range systems.
Employing cabinets of pleasing, inconspicuous proportions
for easy placement, the STEREONS are designed particularly
to complement the Electro-Voice ultra-compact, low-reson-
ance systems which conserve space while retaining low dis-
tortion characteristics and wide-range response.
The STEREON 100 employs a special 8” extended range
speaker and 1$ designed to complement the E-V LEYTON
low-resonance, ultra-compact systems.
The STEREON 300, with slightly different cabinet styling,
employs a two-way system consisting of a RADAX extended-
range speaker, together with a diffraction horn very high
frequency driver. It is designed to operate with the ROYAL
400, REGAL 300 and ESQUIRE 200 systems.
SPECIFICATIONS
STEREON STEREON
100 300
Nominal
Impedance: 8 ohms 8 ohms
Power Handling
Capacity:
Sine Wave — 200 cps.-up, 30 W., 200-2500 cps., 30
max. W.. max; 2500-
20,000 eps., 5 W.,
max.
Program — Maximum undistort- Same as STEREON
ed output of 50 W. 100
amplifier on complex
program signal.
Frequency
TOO MED.
т2 © 727 MH
Silver Lead
7.84 AFC
“Brilliance”
Brilliance Copec ad +
7 H.F.
Driver
Silver Lead =
Component Wiring for STEREON 300
Response Range:
170-13,000 cps.
170-19,000 cps.
Components: Special 8” extended Special 8” extended
range speaker and range speaker, T35B
200 cps. high-pass very high frequency
filter. driver and a cross-
over assembly con-
tains: 3500 cps.
crossover, 200 cps.
high-pass filter, bril-
liance control.
Size: 14" high x 10" wide 14” high x 11%"
x 5%" deep wide x 8%” deep
Finishes: Hand-rubbed ma- Same as for STER-
hogany, walnut, or EON 100
limed oak: unfin-
ished birch.
100 mfd.
To 1E ®
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Fiqure 2 Component Wiring for STEREON 100
ul ulin str mora кет _ sourd Lie smows STER [OM 100
1 | | BROKEN LIME SHOWS SON 300 |
р Em de fat = 4 4 10 ЧТ | |
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Figure 4 Frequency Response for STEREONS 100 and 300
Theory of Operation
No stereophonic effect exists when listening to sounds below
300 cycles per second. since the human ear is incapable of
determining the origin of such sounds. This was proved in
1934 by an acoustic engineer. Harvey Fletcher, who deter-
mined that sounds from about 300 cps. down, with a wave-
length of 3-2/3 ft. or more. are not intercepted to any
detectable degree by the head. Consequently, both ears hear
them alike, and no determination of the direction of the
source is possible. The STEREONS make use of this prin-
ciple, when used with a full-range speaker which reproduces
all the bass from both channels, while sounds above 200
cycles per second are fed through both channels in the normal
stercophonic manner. The STEREONS, then, permit easy
and economical expansion to the stereo system.
Setting Up For Operation
Unpacking Your Unit
Your Electro-Voice STEREON has been packed in accord-
ance with all shipping requirements of the Interstate Com-
merce Commission plus extra protection. Upon opening
carton inspect unit closely. If any shipping damage is found,
contact the carrier immediately, requesting inspection and
instructions. Avoid excessive handling of STEREON units
in unfinished birch. Moisture marks from hands should be
completely removed from wood surface before finish is
applied. See your Electro-Voice dealer for details on the
complete range of Electro-Voice Finishing Kits available for
easy professional finishes in many attractive tones.
Placement
The convenient sizes of the STEREONS provide great flexi-
bility for your stereophonic system. Both models are designed
to fit nicely into bookshelves or other room locations in
which the use of larger units would be impractical. Their
compact design can, in many room arrangements, add extra
usable floorspace and provide the pleasant “airy” quality
sought by modern interior designers.
Connection and Operation for 2-channel Stereo using one
STEREON 100 and one LEYTON or one STEREON 300 and
choice of ESQUIRE 200, REGAL 300 or ROYAL 400.
Connection:
Connect amplifiers, speakers and XT-1 in accordance with
Fig. 6. Use standard #18 or heavier lamp cord.
Checking for Proper Connection:
This can most easily be accomplished by playing a monaural
disc or full track monaural tape through the stereo system.
With equal sound output from each channel and listening in
optimum listening area as shown in Fig. 5 the sound should
appear to come from a point located midway between the
two speakers. If the sound image appears to be split and seems
to emerge simultaneously from each speaker rather than from
the midway point. the speakers are out of phase. This can
be corrected by reversing the connections at one speaker or
the other, but not both.
With both speakers still playing at equal sound levels, check
for proper XT-1 connection by interchanging leads 1 and 2
(see Wiring diagram) and listening for maximum bass. Con-
nection of maximum bass is the correct connection.
Placement for Stereo
Fig. 6 illustrates the placement of a pair of conventional
speakers for sterco; the narrow beam of sound gives good
stereo in only one restricted listening position in the room.
If the listener is too far forward from the apex of the
triangle, the angle becomes greater than 40 degrees, and the
performance area will seem to split in the middle or diverge.
If the listener is too far back, the angle becomes much less
than 30 degrees, and the sound from the two speakers will
become so nearly alike that the result will be a loss of stereo-
phonic effect.
"HOLE IN THE r
MOODLE"
Y)
BEST
LISTEHING
POSITION
[ LOUNO BECOSES
EA A AT
LONGER DISTANCES
Figure 5 Conventional Placement of Speakers for Stereo
Widening the Stereo Area —
3 -channel Listening
The natural extension of 2-channel stereo reproduction is
to recreate completely the original performance suitably
tailored to suit the individual taste and listening area. In
stereo recording great pains are taken to capture every
realism of the music and to insure that nothing of the life
and reality of the original performance is lost.
In modern stereo recording 3 microphones are normally
employed to insure complete coverage of the sound stage.
The sound from the microphone in the center is then appor-
tioned to both left and right channels of recorded sound.
From this master recording emerges the commercially avail-
able 2-channel stereo tape or disc.
In these “two track™ stereo tapes and discs the element of
this third channel remains and can be reformed by means
of the Electro-Voice XT-1 Stereo Mixer Transformer. The
XT-1, connected as shown in Fig. 8, recovers the center
sound from the left and right channels, adds them together
in the correct proportions, and passes them to the central
speaker. (Technically, the third channel signal consists of
A plus B sum tones.)
Thus a still broader curtain of sound is created, giving good
stereo over a larger area, even in listening positions quite
close to the loudspeakers themselves. Stereo reproduction,
ideally, reproduces the effect of the concert hall.
2 CHANNEL STEREO
5
| FULL RANGE (REGAL ,ESQUIRE ETC. )
STEREON FULL RANGE
com en
T2# Ti
T2 Ti LOL o
~~
MOVE
ЭР. STRAPS
XT-1
L.AME 4,BJ6A:
C.AMP COM. RAME
Cc 4 ele са вв
LEFT RIGHT
AMPLIFIER AMPLIFIER
Figure & 2-chonnel Stereo with one full-range specker and one
STEREON
This limitation of a small stereo listening area with con-
ventional loudspeakers is largely solved by the design features
of the treble range component in the Electro-Voice STER-
EONS. The 8” cone speaker gives wide dispersion of the
stereo sounds (mid bass and treble) assisted by the shallow
cone design which prevents masking of tone propagation by
the section near the outer periphery, and in the case of the
STEREON 300, exceptional spread through the diffraction
horn driver. Good stereo may be enjoved by a number of
people (See Fig. 7) by observing the simple placement rules
of having the STEREONS at either corner of the triangle,
the angle at the apex of which is from 30 to 40 degrees.
Figure 7 One ESQUIRE and one STEREON in stereo array, showing
large listening area
Connection and Operation for 3-channel
Stereo using either choice #1 or choice #2
Connections for both choices:
This can most easily be accomplished by playing a monaural
disc or full track monaural tape through the stereo system.
Temporarily disconnect one of the leads going to the center
speaker and set amplifier volume controls for equal sound
output from left and right speakers. While listening in the
optimum position the sound should appear to emerge from
a point midway between the left and right speakers. If the
sound image appears to be split and seems to emerge simul-
taneously from each speaker rather than from the midway
point, the speakers are out of phase. This can be corrected
by reversing the connections at either the left or right
speakers, but not both. With left and right speakers still
playing at equal sound levels, reconnect the center channel.
Interchange leads | and 2 at XT-1 (See diagram) while
listening in close proximity to the center speaker. The con-
nection giving maximum output from the center speaker is
the correct connection.
Operation — choice #1 only:
Using stereo source material, turn treble array control com-
pletely counterclockwise on center speaker (full-range in
this case.) The system is now a 2-channel system. Adjust
SELECT APPROPRIATE WIRING DIAGRAM FOR 3-CHANNEL STEREO
THEN OBSERVE POLARITY CAREFULLY
PANASOUND 3 CHANNEL STEREO
2 STEREONS
| FULL RANGE (REGAL,ESQUIRE,ETC)
STEREON FULL RANGE STEREON
COM Bi
71 Td
re Ti of +] of wr
- -
A
TI
SPRR. BLK. OR T2
LAMP 4,816.02 * T-1
RAMP COM.
LEFT RIGHT
AMPLIFIER
Figure 8 Operation Choice # 1
3-channel Panasound using 2 STEREONS and one full-
range reproducer
PANASOUND 3 CHANNEL STEREO
| STEREON
2 FULL RANGE (REGAL,ESQUIRE,ETC.)
FULL RANGE STEREON [FULL RANGE
CoM en Com sn
rel т rf ©
EJE El Te TI Lo[Hi] Lo[Hi
SPKR. BLK.OR T2
AMP 4,8,16 11 2 X T-|
z | L.AMP COM
%
R.AMP COM.
C 4 8 16 C 4818
LEFT RIGHT
AMPLIFIER AMPLIFIER
Operation Choice #2
3-channel Panasound employing one STEREON and two
full-range reproducers
Figure 9
amplifier controls for desired loudness balance between right
and left channels. Now gradually turn treble array control
clockwise until hole in middle is just filled when listening
fairly close to the speaker array. The setting of this control
will vary in accordance with listener preference.
Operation — choice +2 only:
It is recommended that an AT37 level control be installed
in leads running to center speaker for this case. With treble
array controls in left and right speakers fully on (clockwise)
balancing system on stereo source should proceed as in
choice #1.
For Both Choices:
Brillance controls setting: For most disc recordings in normal
listening environments this control should be set to “normal”
position. The setting of the best balance will vary with en-
vironments and listener preference. However, it is important
that the Brillance controls be set alike on all three speakers.
There are no brilliance controls on the Leyton and Stereon
100, since these units do not contain VHF drivers.
Technical Service:
The distributor from whom you purchased your equipment
knows thoroughly the application of Electro-Voice products
and high-fidelity techniques. His advice on the installation of
Electro-Voice components and on the selection of associated
high-fidelity equipment will be invaluable. Technical problems
which cannot be answered locally may be referred to:
The Manager
High Fidelity Division
Electro-Voice, Inc.
Buchanan, Michigan
TO PER
LauP sg lé a вк (72)
TEST POINT
REYENSE THELE
LEADS
Center Channel Hookup Test Point
3-channel Stereo
Figure 10
When writing, please list the manufacturer and model number
of all components used in your high fidelity system.
Speaker Repairs
Your STEREON system is guaranteed indefinitely against
defects in workmanship or materials. Should the STEREON
become damaged or develop faulty operation from unusual
conditions of use, Electro-Voice maintains a complete service
department to put equipment in factory-new condition. If it
becomes necessary to return the equipment for repair, please
write for authorization and shipping instructions.
Electho yore | ELECTRO-VOICE, INC. / BUCHANAN, MICHIGAN
Part No. 53772
Printed in U.S.A.

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