Electro-Voice 10BX Datasheet

Electro-Voice 10BX Datasheet
10-lnch Extended-Range
Bass Guitar Speaker
Modern bass-guitar
high-frequency response
Very solid, tight lowfrequency response
Ideal upgrade speaker
150 watts long-term power
Edge-wound flat aluminum
wire for maximum output and
"bullet proof" reliability
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 f l ) :
OilS (mechanical 0 at f l ) :
(Ou Om.)
0rs (total at f l : (0 •• + Oms) :
VAS (volume of air having same acoustic
compliance as driver suspension):
42.5 liters (1.5 fP)
110 (half-space reference efficiency):
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
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)
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 1OBX is suitable for full-range reproduction of conventional 4-string basses and
basses with a "dropped-O" tuning (or low-O
extension). Used in multiples, this speaker is
capable of thunderous output levels. 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 8 112-lb magnet structure has been newly designed to provide both
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 generally translate to good high-frequency and transient response.) The most visually obvious
difference in these speakers is the cone and
dust-dome material. It is a new composite made
of paper fibers with mica and epoxy added for
remarkable stiffness. The end result is a speaker
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 without an adapter. The optional SMH-1 speaker
mounting kit facilitates front mounting (see
Installation section).
Replacement Use In Existing Enclosures
The 1OBX will often be used to replace inferior
speakers in existing enclosures. · Mechanical
and electrical characteristics are such that the
superior efficiency, sound quality and reliability
of the 10BX will be realized in virtually any
sealed or vented (bass reflex) enciosure.
Vented Enclosures
The most extended, lowest distortion and bestcontrolled bass performance is usually realized
in properly designed vented enclosures. In
such designs, the vent, or port, actually reproduces the lowest octave or so of bass response. The vent is driven to full acoustic
output by a relatively small motion ofthe speaker
cone itself, acting through the air contained
within the enclosure. The excursion ofthe 10BX
10BX Frequency Response in Typical Enclosure
(vented. 1.2 ft'). 1 Wattl1 Meter
Fillister and Internal Hex Drive Screws for Front
Mounting (not to scale)
.... n,
,r- ~ I---f.-'
70" "
10BX Dimensions
I ('.3510.)
Connection of Two 10BX Speakers in Parallel
(net impedance is 4 ohms)
259 mm
(10.20 in.)
156 mm
(6.13 In.)
10BX Front-Mounting Detail (not to scale)
Connection of Two 10BX Speakers in Series
(net impedance is16 ohms)
10BX Rear-Mounting Detail (not to scale)
Connection of Four 10BX Speakers in Series/Parallel
(net impedance is 8 ohms)
at these frequencies is much reduced compared to sealed or open-backed enclosures,
directly reducing harmonic distortion.
IMPORTANTI When front mounting, the
screw head must fit down Into the front
gasket cutout (see Figure 3).
Often, in bass guitar systems, a perfectly flat
response is not as important as a controlled
response. Typical sound-reinforcement systems are "tuned," so the enclosu re provides the
flattest possible response. Generally, bassguitar 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 tuning is recommended. The low "E" on a bass
guitar actually vibrates at 41.2 Hz, but a 44-Hz
tuning will provide a reasonable amount of vent
contribution or additional 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 of the 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.
Rear Mounting
Rear mounting requires the same diameter
cutout and screw circle as front mounting. Other
comments regarding the use of T-nuts apply to
rear mounting as well.
The 10BX may be front- or rear-mounted, although front mounting is preferred because of
convenience. For simple front mounting, the
convenient SMH-1 mounting accessory is recommended. Complete mounting instructions
for standard front mounting are given below. It
is important that recommended baffle openings
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 locations 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 of the front-mounted speaker is accomplished with the adhesive-backed foam gasket
segments that are included with your new 10BX.
Strip off the protective paper and apply the
gasket to the rear mounting surface of the
speaker rim, making certain that the 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 must be tiIIister head or internal 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.
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 between the screw head and frame (see Figure 4).
Screws should be tightened evenly, but not
excessively. Maximum torque possible with a
proper size screwdriver should be sufficient. 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 of metal 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 waS measured with the
10BX in a 1.2-cubic-foot vented enclosure,
tuned to 40 Hz, placed in an anechoic (echoless)
environment at 1 meter on axis with a 1-watt
swept sine-wave input. The frequency-response
curve is shown in Figure 1.
In musical-instrument systems, unlike soundreinforcement 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
power test closely related to real-life conditions.
Specifically, the 1OBX 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 6 ohm EIA equivalent impedance
(30 volts true rms) . Amplifier clipping sets instantaneous peaks at 6 dB above the continuous power, or 600 watts peak (60 volts peak) .
This procedure provides a rigorous test of both
thermal and mechanical failure modes.
Electro-Voice products are guaranteed against
malfunction due to defects in materials or workmanship for a specified period, as noted in the
individual product-line statement(s) below, orin
the individual product data sheet or owner's
manual, beginning with the date of original
purchase. If such 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 prepaid. Exclusions and Limitations: The Limited
Warranty does not apply to: (a) exterior finish or
appearance; (b) certain specific items described
in the individual product-line statement(s) below, 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 Warranty Service:
To obtain warranty service, a customer must
deliver the product, prepaid, to Electro-Voice or
any of its authorized service representatives
together with proof of purchase of the product in
the form of a bill of sale or receipted invoice. A
list of authorized service representatives is
available from Electro-Voice at 600 Cecil Street,
Buchanan, MI 49107 (616/695-6831 or 8001
234-6831). Incidental and Consequential
Damages Excluded: Product repair or replacement and retu rn to the customer are the only
remedies provided to the customer. ElectroVoice shall not be liable for any incidental or
consequential damages including, without limitation, injury to persons or property or loss of
use. Some states do not allow the exclusion or
limitation of incidental or consequential damages 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
Electro-Voice Speakers and Speaker Systems are guaranteed against malfunction due
to defects in materials or workmanship for a
period of five (5) years from the date of original
purchase. The Limited Warranty does not apply
to burned voice coils or malfunctions such as
cone andlor coil damage resulting from improperly designed enclosures. Electro-Voice active
electronics associated with the speaker systems are guaranteed for three (3) years from
the date of original purchase. Additional details
are included in the Uniform Limited Warranty
Service and repair address for this product:
Electro-Voice, Inc., 600 Cecil Street, Buchanan,
Michigan 49107 (616/695-6831 or 80012346831).
Specifications subject to change without
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