Electro-Voice Centurion Specification

Eleclho Voice.
ELECTRO-VOICE, INC.
BUCHANAN, MICHIGAN
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Centurion IV
Fig. 1— Pictorial Wiring Diagram
Specifications and
Instructions
Centurion Enclosure
Centurion IV and
Senior Centurion IV
The Electro-Voice Centurion IV and Senior Centurion TV employ iden-
tical cabinetry, and differ only in the driver components. The Centurion
IV uses the Model 117 system consisting of a 15SBWK low-frequency
driver, 847HF mid-range coaxial driver, T35B Super-Sonax VHF driver,
X336 crossover network, cable harness and two AT37 level controls.
The Senior Centurion IV uses the Model 105 driver components con-
sisting of the 15WK low-frequency driver, 848HF coaxial mid-range
assembly, T35 Super-Sonax VHF driver, X336 crossover network, two
AT37 level controls and a cable harness.
The Centurion uses the exclusive Electro-Voice "W” type folded horn.
The "W” horn is a single path indirect radiator utilizing the room
corner. The completely sealed rear cone air load is used as an acoustic
compliance to resonate with the inductive mass of the air in the horn
throat, forming a broadly tuned low-frequency resonant circuit which
extends and augments the lower bass spectrum of the loudspeaker.
Because of the relatively small number of parts, and short length of the
horn, efficiency is very high, and radiation in the low-bass and impor-
tant mid-bass regions approaches that theoretically possible from a
perfect horn.
The Centurion is a corner horn type enclosure, and for best reproduc-
tion should be placed in a corner situation. The Centurion may, how-
ever, be used along a side wall if an artificial corner is constructed
behind it. Such a corner should be of a minimum height of 40 inches
and have minimum side wall lengths of 4 feet intersecting at 90°
behind the loudspeaker. Response of the Centurion is enhanced by
more than 6 db below 200 cycles when used in a corner.
SPECIFICATIONS
Senior
Centurion IV Centurion IV
Sensitivity Rating: 48 db 51 db
Power Rating:
Program: 20 watts 35 watts
Peak: 40 watts 70 watts
Size: 40 in. high, 30 in. wide, 224 in. deep
Shipping Weight: 74 lb 132 lb
(54 Ib. Centurion Cabinet only)
INSTALLATION
15-INCH DRIVER. To install the 15-inch Klipsch type low-frequency
driver, remove the screws from the periphery of the low-frequency
cavity, accessible through the back port of the enclosure, Install the
driver in place as shown in Figure 1. The 15-inch driver is inserted
through the top hole on an angle and then rotated into position. Place
the driver so that the four rim holes coincide with the T-nuts in the
speaker mounting board. Insert machine screws and washers and
tighten them evenly and just snugly enough to avoid injuring and dis-
torting the loudspeaker frame. Attach leads to the 15-inch driver and
feed through the hole in the top of the enclosure. Follow Figure 1
and Figure 2 for proper color coding to insure correct phasing of
the driver.
MID-RANGE DRIVER — The installation of mid-range drivers differs
for the Centurion IV and Senior Centurion IV.
In the Centurion IV, with Model 117 system, the Model 847HF driver
is used. The 847HF is bolted to the inner cabinet right-hand dividing
panel with two 14 x20 bolts. The 847HF brackets should be tight-
ened after the unit is in place to assure proper positioning. Wire the
847HF before mounting, following the wiring diagrams shown in
Figures 1 and 2 for the Centurion system.
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Senior Centurion IV
Fig. 1 — Pictorial Wiring Diagram
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Fig. 2 — Schematic Wiring Diagram
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Part No. 53312
In the Senior Centurion IV the Model 848HF coaxial mid-range assem-
bly is used. The 848HF mounts with the bracket placed on top of the
low-frequency driver cover, and is bolted in place with the front lip of
the 848HF resting on the shelf divider toward the front of the bass horn
path. In mounting the Senior Centurion IV mid-range driver, the T35
Super-Sonax VHF mid-range driver must be installed first for when the
848HF is mounted in place, the mounting slot for the T35 will no
longer be accessible.
INSTALLATION OF CROSSOVER — The X336 crossover network is
mounted on top of the low-frequency driver cover. The crossover is
fixed in place with four wood screws through the corners of the cross-
over case. Connections should be made to the various crossover terminals
as shown in Figures 1 and 2.
Insert the AT37 level controls with the lugs toward top of cabinet un-
der the decals marked “Presence” and “Brilliance”, Replace the AT37
dials and affix them by tightening the lock nuts with a pair of long-
nosed pliers. Replace the knobs on the AT37 controls and note to be
sure that the dot on the knobs coincide with the zero on the dial at
maximum clockwise rotation.
VHF DRIVER — To install the T35 (or T35B) VHF driver, place the
driver in position on the small vertical port, making certain it seats
tightly against the gasket. Put the special half-cork-covered washers
in place on the back of the driver horn. Follow this by conventional
washers and nuts, tightening carefully.
OPERATION
PLACEMENT — The Centurion can now be placed in the corner of the
room or along the wall. Connect the system to the amplifier by running
two leads (fixture wire No. 18) from the “Common” and "16-0hm”
amplifier output taps to the lead-in wires of the system.
ADJUSTMENT OF LEVEL CONTROLS — Level controls are provided for
adjusting the amount of energy fed to the mid-range and very-high-
frequency drivers in the 117 and 105 four-way systems. The level
control marked “Presence” controls that frequency range lying in the
region between 300 cycles and 3500 cycles, and the ‘Brilliance’ control
governs the amount of energy radiated above 3500 cycles. Generally,
because of the increased efficiency of these high-range drivers, the
“Brilliance” and “Presence” controls should be adjusted to a partially
retarded setting. Exact positioning of these controls will depend on
room acoustics and should be adjusted for most pleasing reproduction.
Rooms having heavy drapes, thick rugs, or overstuffed furniture will
usually require a more advanced setting of the "Brilliance” control
than normal situations. To achieve a “front row” effect, the reproduc-
tion of the mid-range reproducer may be enhanced by advancing the
“Presence” contral.
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LEVEL ON AXIS RESPONSE
CENTURION 7 +48 db.
RESPONSE IN DB
FREQUENCY IN GYCLES PER SECOND
Fig. 3 — Frequency Response Centurion IV
/ BUCHANAN, MICHIGAN
Printed in U.S.A.