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The 1508he is best used as the bottom
end of a full range enclosure. It has very
high efficiency for superior output in the
mid-bass and mid-range. However, for
pure subwoofer applications, the 1508sps
or 1508cu are better choices.
The 1208sps works well in sealed or
vented enclosure designs, and its
smooth, extended frequency response
makes it an excellent mid-range
performer. It is available in 4 and 8 Ohm
versions.
Because the 1208sps’s low frequency
output is limited, it should be used along
with a subwoofer when response below
60 Hz is needed. The best application for
the 1208sps is in compact enclosures
and very high quality mid-bass/mid-range
reproduction at high sound pressure
levels.
The 15" drivers can work with crossover
points as high as 2.0 kHz but work best
below 1.5 kHz. The 12" drivers are
usable to 3.5 kHz but perform best below
2.5 kHz.
ENCLOSURES
To assist with the growing interest in
home-built enclosure designs, Peavey
provides complete parameter data on
these drivers as well as several
recommended enclosures for each
model. This information and much more
can be found at www.peavey.com.
Enclosures should be built of best-quality
3/4" marine or other high grade plywood.
Particle board and MDF enclosures can
be easily damaged and are not
recommended for portable applications,
but may be acceptable for permanent
installation. If construction plywood must
be used, inspect each sheet thoroughly
and use at least BC grade.
Use a quality wood glue, fit joints tightly,
and add internal bracing to stiffen the
panels of the enclosure. Look at
commercially designed enclosures for
ideas on good brace placement. Use
wood screws or a pneumatic nailer to
assemble the enclosure during gluing, to
maximize joint strength.
Strength of the completed enclosure has
a great effect on the bass performance of
the finished system. Box panels that
aren’t stiff enough will vibrate – cancelling
bass produced by the woofer, and
creating undesired sounds of their own. If
your box vibrates or you don’t think the
box panels are stiff enough, add more
bracing.
Vents used in the examples require
standard Schedule 40 PVC pipe for vent
construction. The pipe should be dadoed
tightly into the back of the baffle and
glued firmly in place with high quality
epoxy or high strength industrial grade
hot glue. Rough up the outside of the
pipe to improve the glue bond.
Be sure to account for the displacement
of the vent, bracing, horn (if used) and
woofer or your enclosure before building
it, or it will be smaller than its intended
volume. This can reduce bass output and
mis-tune the enclosure.
Line the inside of the enclosure with
polyester fiber batting such as quilt
stuffing. The batting material should
conform to California bedding fire codes.
Attach the batting with spray adhesive or
staples, and keep it away from the end of
the vent tube where it could be pulled in
by air flow. Handles, protective corners,
cabinet covering, grille materials and
crossovers are available through Peavey
Accessories.
When building a bandpass enclosure,
design a panel or door to be removable
for access to the woofer. Use foam
weather-strip to seal the panel along with
enough screws and bracing to prevent
leaks and buzzes. Fill the sealed volume
loosely with polyester fiber, but leave the
vented volume empty. Place the magnet
of the woofer in the vented side for
improved cooling.
Peavey does not supply hardware
required for the manufacturing of flying
systems, and recommends that builders
should not suspend or fly any enclosure
not certified for such applications.
These instructions are a general
guideline for design. Proper construction
techniques, good planning and common
sense will result in a reliable, high quality,
high performance system.
Peavey in no way accepts liability for any
damage, accidents or injury that may
result from construction or use of
enclosures using this information.
Features and specifications are subject to
change without notice.
PARAMETERS
Thiele-Small parameters for Black
Widow
®
1208 and 1508 drivers follow.
This data is for use in designing
enclosures. Numerous software packages
are available that use this data to
simulate the response of the driver and
enclosure together for optimum
performance in any application.
PARAMETER DEFINITIONS
Z
nom
: The nominal impedance of the
driver in Ohms.
R
evc
: DC resistance of the driver in
Ohms. Also known as Re.
S
d
: The functional radiating surface
area of the cone assembly, in meters
2
.
BL: Efficiency of the voice coil and
magnet system in Telsa Meters.
F
o
: Also known as Fs, the free air
resonance of the driver.
V
as
: Volume of air having the same
compliance (springiness) as the driver’s
suspension.
C
ms
: Restorative force of the driver’s
suspension in micrometers/Newton.
M
ms
: The total mass of the moving
parts of the loudspeaker, including the air
load, in grams.
Q
ms
: Resonance characteristics of the
mechanical factors of the loudspeaker.
Q
es
: Resonance characteristics of
electrical factors of the loudspeaker.
Q
ts
: Resonance characteristics of the
electrical and mechanical factors
combined together.
X
max
: Distance the cone can move in
one direction before the coil begins to
leave the magnetic gap.
L
e
: Inductance of the voice coil in
millihenries.
SPL: Typical sound pressure level at
1 Watt, 1 meter.
n
o
: Electrical-to-acoustical
conversion efficiency in percent.
V
d
: Air displacement of the driver
from negative Xmax to positive Xmax, in
milliliters.
P
max
: Maximum continuous program
power in Watts.
Disp: Volume displaced by the driver
inside the cabinet when mounted on its
rear flange, in inches
3
.
SUGGESTED ENCLOSURES
For those who want to build their own enclosures, but don’t want to go through the design process using driver parameters, we provide the following optimized designs:
FOR 1508-4/8sps:
Sealed enclosure
May be preferred for stage monitors to control boominess and low frequency feedback on stage. F
3
is 73 Hz.
Small vented enclosure
Excellent performance for compact, general purpose use. Warm mid-bass response. F
3
is 51 Hz.
Medium vented enclosure
Terrific compromise of bass performance and enclosure size. Warm mid-bass response. F
3
is 45 Hz.
Large vented enclosure
Big box, big bass! Great response as a subwoofer or the bottom end of a large multi-way enclosure design. F
3
is 41 Hz.
Single reflex bandpass enclosure
Special enclosure design that uses the enclosure as an acoustic filter for shaped response. Great choice for a compact subwoofer system. Response is 48 Hz – 138 Hz.
FOR 1508-8cu:
Small vented enclosure
An incredibly small enclosure with outstanding bass performance for its size. F
3
is 53 Hz.
Medium vented enclosure
Small box with powerful bass and predictable, flat response down to an F
3
of 45 Hz.
Large vented enclosure
Strong, flat response with bass extension to an F
3
of 41 Hz. Deep, predictable bass quality for great subwoofer and multi-way system performance.
FOR 1508-8he:
Small vented enclosure
Small box, big voice. Very high efficiency and good bass performance in a small enclosure. F
3
is 60 Hz.
Medium vented enclosure
Super-high efficiency in a popular enclosure size. F
3
is 55 Hz. Great choice for use in a full-range system.
Large vented enclosure
Big and loud! Super efficiency and strong bass performance to an F
3
of 50 Hz. However, for subwoofer-only use the sps and cu versions which are better performers.
FOR 1208-4/8sps:
Sealed enclosure
Excellent choice for a dedicated mid-bass/mid-range in a multiway system, or stage monitor. F
3
is 105 Hz.
Small vented enclosure
Very small system with excellent voice range perforance. Great choice as the mid-range of a sub/satellite system. F
3
is 79 Hz. Also good for use in a stage monitor.
Large vented enclosure
Still not all that large, with very usable bass response. Great for a compact, 2-way box. F
3
is 61 Hz.
SPECIFICATIONS
Model Name: 1508-8sps 1508sps-4 1508-8cu 1508-8he 1208-8sps 1208-4sps
Part #: 00452850 00452860 00452870 00457680 00452830 00452840
Size: inches/mm 15" / 380 mm 15" / 380 mm 15" / 380 mm 15" / 380 mm 12" / 305 mm 12" / 305 mm
nominal nominal nominal nominal nominal nominal
Frame OD 15- Frame OD 15- Frame OD 15- Frame OD 15- Frame OD 12- Frame OD 12-
1/4" / 387 mm 1/4" / 387 mm 1/4" / 387 mm 1/4" / 387 mm 1/4" / 311 mm 1/4" / 311 mm
Bolt circle Bolt circle Bolt circle Bolt circle Bolt circle Bolt circle
14-9/16" 14-9/16" 14-9/16" 14-9/16" 11- 5/8" 11- 5/8"
370 mm, 8 holes 370 mm, 8 holes 370 mm, 8 holes 370 mm, 8 holes 295 mm, 8 holes 295 mm, 8 holes
Cutout diameter Cutout diameter Cutout diameter Cutout diameter Cutout diameter Cutout diameter
14" / 356 mm 14" / 356 mm 14" / 356 mm 14" / 356 mm 10 15/16" / 278 mm 10 15/16" / 278 mm
Depth 4-31/32" Depth 4-31/32" Depth 4-31/32" Depth 4-31/32" Depth 3-17/32" Depth 3-17/32"
126 mm 126 mm 126 mm 126 mm 90 mm 90mm
Impedance: 8 Ohms 4 Ohms 8 Ohms 8 Ohms 8 Ohms 4 Ohms
Power Capacity: 2000 W peak 2000 W peak 2000 W peak 2000 W peak 2000 W peak 2000 W peak
1000 W program 1000 W program 1000 W program 1000 W program 1000 W program 1000 W program
500 W continuous 500Wcontinuous 500 W continuous 500 W continuous 500 W continuous 500 W continuous
per AES 2-1984, per AES 2-1984, per AES 2-1984, per AES 2-1984, per AES 2-1984, per AES 2-1984,
50 Hz - 500 Hz 50 Hz - 500 Hz 50 Hz - 500 Hz 50 Hz - 500 Hz 65 Hz - 650 Hz 65 Hz - 650 Hz
Sensitivity: 96.7 dB 1 Watt / 97.5 dB 1 Watt / 97.2 dB 1 Watt / 100.3 dB 1 Watt / 96.9 dB 1 watt / 96.6 dB 1 watt /
1 meter 1 meter 1 meter 1 meter 1 meter 1 meter
Usable
frequency range: 35 Hz ~ 2 kHz 35 Hz ~ 2 kHz 35 Hz ~ 2 kHz 40 Hz ~ 2 kHz 50 Hz ~ 3.5 kHz 50 Hz ~ 3.5 kHz
Cone: Kevlar
®
Kevlar Kevlar Kevlar Kevlar Kevlar
impregnated impregnated impregnated impregnated impregnated impregnated
cellulose cellulose cellulose cellulose cellulose cellulose
Voice coil diam: 4.0" / 100 mm 4.0" / 100 mm 4.0" / 100 mm 4.0" / 100 mm 4.0" / 100 mm 4.0" / 100 mm
Voice coil material: Aluminum ribbon Aluminum ribbon Copper ribbon Aluminum ribbon Aluminum ribbon Aluminum ribbon
wire wire wire wire wire wire
Polyimide- Polyimide- Polyimide- Polyimide- Polyimide- Polyimide-
impregnated impregnated impregnated impregnated impregnated impregnated
fiberglass fiberglass fiberglass fiberglass fiberglass fiberglass
former former former former former former
Nomex
®
stiffener Nomex stiffener Nomex stiffener Nomex stiffener Nomex stiffener Nomex stiffener
Solderless Solderless Solderless Solderless Solderless Solderless
diffusion welded diffusion welded diffusion welded diffusion welded diffusion welded diffusion welded
OFHC copper OFHC copper OFHC copper OFHC copper OFHC copper OFHC copper
leads leads leads leads leads leads
Net weight: 17 lbs. / 7.7 kg 17 lbs. / 7.7 kg 17 lbs. / 7.7 kg 17 lbs. / 7.7 kg 16 lbs. / 7.3 kg 16 lbs. / 7.3 kg
Driver Parameters
Z
nom
(Ohms) 8 4 8 8 8 4
R
evc
(Ohms) 5.27 3.30 5.91 5.32 5.43 3.47
S
d
(M
2
) 0.084 0.084 0.084 0.084 0.052 0.052
BL (T/M) 15.37 12.72 20.84 16.04 15.13 14.09
V
as
(liters) 185.9 163.6 199.6 182.4 54.6 66.2
F
o,
Hz. 41.9 45.9 36.7 51.2 56.1 55.4
C
ms
(uM/N) 158.5 163.3 199.2 182 142.2 172.5
M
ms
(gm) 77.6 73.5 93.9 52.9 50.7 47.9
Q
ms
10.357 11.197 9.314 10.604 9.513 7.085
Q
es
0.457 0.433 0.295 0.352 0.448 0.311
Qts 0.437 0.417 0.286 0.341 0.428 0.298
X
max
(mm) 4.7 2.3 4.7 1.9 4.7 2.3
L
e
(mH) 0.418 0.211 0.583 0.336 0.359 0.186
SPL (1W 1m) 96.7 97.5 97.2 100.3 96.9 96.6
n
o
(%) 2.9 3.6 3.3 6.7 3.1 2.9
V
d
(milliliters) 789 386 789 319 488 302
Pmax (w. pgm.) 1000 1000 1000 1000 1000 1000
Disp in
3
/ ml 197 / 3229 197 / 3229 197 / 3229 197 / 3229 109 / 1797 109 / 1797
10
Frequency, Hz
50 100 Hz 500 1K
SPL,dB
100
95
90
85
80
75
70
65
60
1508sps sealed box
1508sps small vented box
1508sps medium vented box
1508sps large vented box
1508sps single reflex bandpass
10
Frequency, Hz
50 100 Hz 500 1K
SPL, dB
100
95
90
85
80
75
70
65
60
1508-8cu small vented box
1508-8cu medium vented box
1508-8cu large vented box
1508sps
1508-8cu
10
Frequency, Hz
50 100 Hz 500 1K
SPL, dB
105
100
95
90
85
80
75
70
65
1508he small vented box
1508he medium vented box
1508he large vented box
10
Frequency, Hz
50 100 Hz 500 1K
SPL, dB
105
100
95
90
85
80
75
70
65
1208sps sealed box
1208sps small vented box
1208sps large vented box
1508he
1208sps
Kevlar
®
is a registered trademark of DuPont.
Rubatex
®
is a registered trademark of
Rubatex Corporation.
Nomex
®
is a registered trademark of
DuPont.