Electro-Voice 10BX User manual

SPECIFICATIONS
Usable Frequency Response
in a Typical
Vented 1.2-Cubic-Foot Enclosure
(1 wattl1 meter; see Figure 1):
36-8,000 Hz
Sound Pressure Level (1 wattl1 meter):
98.5 dB
Long-Term Average Power Handling
Capacity (per EIA RS-426-A 1980; see
Power Handling section):
150 watts
Nominal Impedance:
8 ohms
Voice-Coil Diameter:
63.5
mm (2.5 in.)
Thiele-Small Driver Parameters
fl(free-air resonance frequency):
63 Hz
0ES (electromagnetic 0 at fl ):
0.342
OilS (mechanical 0 at fl ):
6.5
(Ou Om.)
0rs (total °at fl: (0 •• + Oms) :
0.325
VAS (volume of air having same acoustic
compliance as driver suspension):
42.5 liters (1.5 fP)
110 (half-space reference efficiency):
3.0%
Vo (peak displacement volume of
diaphragm: So x Xmax):
0.113 liters (0.004 fP)
So (effective diaphragm area):
0.342 m2 (132.6 in.»
Xmax (peak linear displacement of
diaphragm):
3.3
mm (0.13 in.)
R. (dc resistance
of voice coil):
5.2 ohms ±10%
Mounting Information
(see Installation section),
Mounting Hole Diameter
(eight evenly spaced holes):
7.1 mm (0.28 in .) -letter "L" drill
Bolt Circle Diameter:
244
mm (9.62 in.)
Baffle Opening Diameter
(front or rear mounting):
229 mm (9 .0 in.)
Optional Mounting Accessory:
SMH-1 mounting hardware kit
Dimensions (see Figure 2),
Overall Diameter:
259
mm (10.20 in.)
Overall Depth:
110 mm (4.35 in .)
Net Weight:
5.22
kg (11.5 Ib)
Shipping Weight:
6.4
kg (14Ib)
DESCRIPTION
The Electro-Voice 10BX is a premium 1O-inch
speaker designed for bass guitar. This speaker
is ideal for the bass guitarist who needs to hear
all of the tones and nuances that his four-string
bass
is capable of producing, at high stage
levels. The 1 OBX is suitableforfull-range repro-
duction of conventional 4-string basses and
basses with a "dropped-O" tuning (or low-O
extension). Used in multiples, this speaker is
capable ofthunderousoutputlevels.The 10BX
is perfect for the modern bassist who may be
incorporating "pop" and "slap" techniques into
his/her playing. Power capacity
is 150 watts
per EIA RS-426-A 1980. The Power-Handling
section describes these ratings in detail.
This speaker has been "voiced" specifically for
modern bass-players.The 81
12-lb magnetstruc-
ture has been newly designed to provide both
10BX
10-lnch Extended-Range
Bass Guitar Speaker
• Modern bass-guitar
performance-extended
high-frequency response
• Very solid, tight low-
frequency response
• Ideal upgrade speaker
• 150 watts long-term power
capacity
• Edge-wound flat aluminum
wire for maximum output and
"bullet proof" reliability
•
98.5-d8 sensitivity
high energy and relatively light weight. The
overhung voice coil
is constructed of a single
layer of flat aluminum wire for light weight, low
inductance and high efficiency. (Remember,
light weight in a speaker's moving system and
high efficiency
in the magnet structure gener-
ally translate to good high-frequency and tran-
sient response.) The most visually obvious
difference
in these speakers is the cone and
dust-domematerial. Itisanewcomposite made
of paper fibers with mica and epoxy added for
remarkablestiffness.The end resultisaspeaker
with a very light-weight moving system and a
bright and open sound. Like most professional
Electro-Voice speakers, this speaker utiiizes
an extremely rugged cast aluminum frame to
ensure long-term mechanical integrity.
The 10BX may
be front- or rear-mounted with-
out an adapter. The optional
SMH-1 speaker
mounting kit facilitates front mounting (see
Installation section).
RECOMMENDED ENCLOSURES
Replacement Use In
Existing Enclosures
The 1
OBX will often be used to replace inferior
speakers
in existing enclosures.·Mechanical
and electrical characteristics are such that the
superiorefficiency, sound quality and reliability
of the 10BX will be realized in virtually any
sealed or vented (bass reflex) enciosure.
Vented Enclosures
The mostextended, lowest distortion and best-
controlled bassperformance is usuallyrealized
in properly designed vented enclosures. In
such designs, the vent, or port, actually repro-
duces the lowest octave or so of bass
re-
sponse. The vent is driven to full acoustic
outputbyarelativelysmall motionofthespeaker
cone itself, acting through the air contained
within the enclosure.Theexcursion ofthe10BX

10BX SPECIFICATION GRAPHICS
FIGURE 1- 10BX Frequency Response in Typical Enclosure
(vented. 1.2 ft'). 1 Wattl1 Meter
III
"0
110
100
.s 90
...I
Q.
1/1
80
/
/
70" "
V
..
,r-
~
I---f.-'
"Y V
,
'"
'DO
... 1000 2000
FREQUENCY IN HERTZ
FIGURE 2- 10BX Dimensions
....
n,
'~
....
I
110mm 1--
('.3510.) h
259 mm
(10.20 in.)
FIGURE 3 - 10BX Front-Mounting Detail (not to scale)
FIGURE 4 - 10BX Rear-Mounting Detail
(not to scale)
~---T-NUT
156 mm
(6.13 In.)
LJ
'\j"'f--- SPEAKER FRAME
LOCK WASHER
FIGURE 5 - Fillister and Internal Hex Drive Screws for Front
Mounting (not to scale)
FILLISTER·HEAD
SCREW INTERNAL HEX·DRIVE
MACHINE SCREW
FIGURE 6 - Connection of Two 10BX Speakers in Parallel
(net impedance is 4 ohms)
=-~-'lIo...:B~LACK
+ 4 OHMS
FIGURE 7 - Connection of Two 10BX Speakers in Series
(net impedance is16 ohms)
+ 16 OHMS
FIGURE 8 - Connection of Four 10BX Speakers in Series/Parallel
(net impedance is 8 ohms)
BLACK
80HMS
+

at these frequencies is much reduced com-
pared to sealed or open-backed enclosures,
directly reducing harmonic distortion.
Often, in bass guitar systems, a perfectly flat
response
is not as important as a controlled
response. Typical sound-reinforcement sys-
tems are "tuned,"so the enclosu re provides the
flattest possible response. Generally, bass-
guitar system performance is improved if the
enclosure is vented or tuned for roughly the
lowest notes that will be played through it. For
standard tuning four-string bass, a 44-Hz tun-
ing is recommended. The low "E" on a bass
guitar actually vibrates at 41.2 Hz, but a 44-Hz
tuning will provide a reasonable amountof vent
contribution oradditional output at
41 .2 Hz. If a
four-string bass with a "dropped
0" is used, the
recommended tuning frequency
is 40 Hz. For
any ofthe above examples, the recommended
enclosure internal volume
is approximately 1.2
cubic feet per speaker. The larger the volume,
the less equalization will be required.
INSTALLATION
The 10BX may be front- or rear-mounted, al-
though front mounting is preferred because of
convenience. For simple front mounting, the
convenient SMH-1 mounting accessory
is rec-
ommended. Complete mounting instructions
for standard front mounting are given below. It
is importantthat recommended baffleopenings
and mounting hole locations be followed.
Front Mounting
Front mounting requires a 229-mm (9.0-in.)
diameter cutout and a 244-mm (9.62-in.) bolt
circle. Mark the baffle opening and screw loca-
tions on the blank panel first. Drill the screw
holes before cutting the large baffle opening.
If 1/4-20 screws are used, four screws are
sufficient for secure mounting of the speaker.
T-nuts are recommended for simple, secure
mounting.
If T-nuts are used, the holes should
be 7.1-mm (0.281-in.) diameter (letter "L" drill).
Apply glue to the flanges of 1/4-20 long shank
T-nuts before driving into the rear of the holes.
Sealing ofthe front-mounted speaker is accom-
plished with the adhesive-backed foam gasket
segmentsthatareincluded withyournew 10BX.
Strip off the protective paper and apply the
gasket to the rear mounting surface of the
speaker
rim, makingcertain thatthe holes in the
gasket line up with the mounting holes
in the
speaker frame.
Length of the
1/4-20 screws should be 1/2-inch
plus the panel thickness when using T-nuts.
The screws mustbe tiIIisterhead orinternal hex
drive machine screws to seat down
in the
recess of the speaker frame gasket (see
Figure
3). Screws should be tightened evenly
and securely. Maximum torque possible with a
proper size screwdriver should be sufficient.
IMPORTANTI When front mounting, the
screw head must fit down Into the front
gasket cutout (see Figure 3).
Rear
Mounting
Rear mounting requires the same diameter
cutoutandscrewcircleas front mounting.Other
comments regarding the use of T-nuts applyto
rear mounting as well.
Screw length should be 3/4-inch plus panel
thickness if using T-nuts-4onger for standard
hex nuts. If hex nuts are used, a second nut
should be tightened against the first nut to
prevent loosening during operation. A lock
washer and flat washer are recommended be-
tweenthe screwheadand frame (see Figure 4).
Screws should be tightened evenly, but not
excessively. Maximum torque possible with a
propersize screwdrivershould besufficient.
Do
not use adhesive-back gasket segments for
rear mounting.
Custom Enclosures
If a cabinet is to be constructed from scratch,
3/4-inch solid and jointed or marine plywood is
recommended. After construction, be certain
interior
is completely free ofmetal filings, wood
chips, etc.
Electrical
Connections
Use no. 18 or larger stranded wire to connect
the two terminals
on the loudspeaker to the
amplifier output.
FREQUENCY RESPONSE
Frequency response waS measured with the
10BX in a 1.2-cubic-foot vented enclosure,
tuned
to 40Hz, placed in an anechoic(echoless)
environment at 1 meter
on axis with a 1-watt
sweptsine-wave input. The frequency-response
curve
is shown in Figure 1.
POWER-HANDLING
In musical-instrument systems, unlike sound-
reinforcement systems, it is advisable to use
speakers that are rated for at least as much
power as your amplifier output rating.
To our knowledge, Electro-Voice was the first
U. S. manufacturer to develop and publish a
powertestclosely related to real-life conditions.
Specifically, the 1
OBX is designed to withstand
the power test described in EIA RS-426-A
1980.The EIA test spectrum is applied for eight
hours. This shaped signal
is sent to a power
amplifier with the continuous power set at 150
watts into the 6ohm EIA equivalent impedance
(30 volts true rms). Amplifier clipping sets in-
stantaneous peaks at 6 dB above the continu-
ous power, or 600 watts peak (60 volts peak).
This procedure provides a rigorous test of both
thermal and mechanical failure modes.
UNIFORM LIMITED WARRANTY
Electro-Voice products are guaranteed against
malfunction due to defects in materialsorwork-
manship for a specified period, as noted in the
individualproduct-linestatement(s) below, orin
the individual product data sheet or owner's
manual, beginning with the date of original
purchase.Ifsuch malfunction occurs during the
specified period,the product will be repaired or
replaced (at our option) without charge. The
product will be returned to the customer pre-
paid. Exclusions and Limitations: The Limited
Warrantydoes notapplyto: (a) exteriorfinish or
appearance;(b) certain specificitemsdescribed
in the individual product-line statement(s) be-
low, or in the individual product data sheet or
owner's manual; (c) malfunction resulting from
use or operation of the product other than as
specified
in the product data sheet or owner's
manual; (d) malfunction resulting from misuse
or abuse of the product; or (e) malfunction
occurring at any time after repairs have been
made to the product by anyone other than
Electro-Voice or any of its authorized service
representatives.
Obtaining WarrantyService:
To obtain warranty service, a customer must
deliverthe product, prepaid,to Electro-Voiceor
any of its authorized service representatives
togetherwith proofofpurchase ofthe productin
the form of a bill of sale or receipted invoice. A
list of authorized service representatives is
availablefrom Electro-Voiceat600Cecil Street,
Buchanan,
MI 49107 (616/695-6831 or 8001
234-6831). Incidental and Consequential
Damages Excluded: Productrepairorreplace-
ment and retu rn to the customer are the only
remedies provided to the customer. Electro-
Voice shall not be liable for any incidental or
consequential damages including, without limi-
tation, injury to persons or property or loss of
use. Some states do not allow the exclusion or
limitation of incidental
or consequential dam-
ages so the above limitation or exclusion may
not apply to you.
Other Rights: This warranty
gives you specific legal rights, and you may
also have other rights which vary from state to
state.
Electro-Voice Speakers and Speaker Sys-
tems are guaranteed against malfunction due
to defects in materials or workmanship for a
period of five
(5) years from the date of original
purchase. TheLimitedWarrantydoesnotapply
to burned voice coils or malfunctions such as
cone andlorcoil damage resulting from improp-
erly designed enclosures. Electro-Voice active
electronics associated with the speaker sys-
tems are guaranteed for three (3) years from
the date oforiginal purchase.Additional details
are included in the Uniform Limited Warranty
statement.
Service and repair address for this product:
Electro-Voice, Inc
., 600Cecil Street,Buchanan,
Michigan 49107 (616/695-6831
or 8001234-
6831).
Specif ications subject to change without
notice.