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The 1508he is best used as the bottom
Vents used in the examples require
end of a full range enclosure. It has very
standard Schedule 40 PVC pipe for vent
high efficiency for superior output in the
construction. The pipe should be dadoed
mid-bass and mid-range. However, for
tightly into the back of the baffle and
pure subwoofer applications, the 1508sps
glued firmly in place with high quality
or 1508cu are better choices.
epoxy or high strength industrial grade
hot glue. Rough up the outside of the
The 1208sps works well in sealed or
pipe to improve the glue bond.
vented enclosure designs, and its
smooth, extended frequency response
Be sure to account for the displacement
makes it an excellent mid-range
of the vent, bracing, horn (if used) and
performer. It is available in 4 and 8 Ohm
woofer or your enclosure before building
versions.
it, or it will be smaller than its intended
volume. This can reduce bass output and
Because the 1208sps's low frequency
mis-tune the enclosure.
output is limited, it should be used along
with a subwoofer when response below
Line the inside of the enclosure with
60 Hz is needed. The best application for
polyester fiber batting such as quilt
the 1208sps is in compact enclosures
stuffing. The batting material should
and very high quality mid-bass/mid-range
conform to California bedding fire codes.
reproduction at high sound pressure
Attach the batting with spray adhesive or
levels.
staples, and keep it away from the end of
the vent tube where it could be pulled in
The 15" drivers can work with crossover
by air flow. Handles, protective corners,
points as high as 2.0 kHz but work best
cabinet covering, grille materials and
below 1.5 kHz. The 12" drivers are
crossovers are available through Peavey
usable to 3.5 kHz but perform best below
Accessories.
2.5 kHz.
When building a bandpass enclosure,
ENCLOSURES
design a panel or door to be removable
for access to the woofer. Use foam
To assist with the growing interest in
weather-strip to seal the panel along with
home-built enclosure designs, Peavey
enough screws and bracing to prevent
provides complete parameter data on
leaks and buzzes. Fill the sealed volume
these drivers as well as several
loosely with polyester fiber, but leave the
recommended enclosures for each
vented volume empty. Place the magnet
model. This information and much more
of the woofer in the vented side for
can be found at www.peavey.com.
improved cooling.
Enclosures should be built of best-quality
Peavey does not supply hardware
3/4" marine or other high grade plywood.
required for the manufacturing of flying
Particle board and MDF enclosures can
systems, and recommends that builders
be easily damaged and are not
should not suspend or fly any enclosure
recommended for portable applications,
not certified for such applications.
but may be acceptable for permanent
installation. If construction plywood must
These instructions are a general
be used, inspect each sheet thoroughly
guideline for design. Proper construction
and use at least BC grade.
techniques, good planning and common
sense will result in a reliable, high quality,
Use a quality wood glue, fit joints tightly,
high performance system.
and add internal bracing to stiffen the
panels of the enclosure. Look at
Peavey in no way accepts liability for any
commercially designed enclosures for
damage, accidents or injury that may
ideas on good brace placement. Use
result from construction or use of
wood screws or a pneumatic nailer to
enclosures using this information.
assemble the enclosure during gluing, to
maximize joint strength.
Features and specifications are subject to
change without notice.
Strength of the completed enclosure has
a great effect on the bass performance of
PARAMETERS
the finished system. Box panels that
aren't stiff enough will vibrate – cancelling
Thiele-Small parameters for Black
bass produced by the woofer, and
Widow
®
1208 and 1508 drivers follow.
creating undesired sounds of their own. If
This data is for use in designing
your box vibrates or you don't think the
enclosures. Numerous software packages
box panels are stiff enough, add more
are available that use this data to
bracing.
simulate the response of the driver and
enclosure together for optimum
SPECIFICATIONS
performance in any application.
Model Name:
Part #:
PARAMETER DEFINITIONS
Size: inches/mm
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
2
area of the cone assembly, in meters
.
BL:
Efficiency of the voice coil and
magnet system in Telsa Meters.
Impedance:
F o :
Also known as Fs, the free air
Power Capacity:
resonance of the driver.
V as :
Volume of air having the same
compliance (springiness) as the driver's
Sensitivity:
suspension.
C ms :
Restorative force of the driver's
Usable
frequency range:
suspension in micrometers/Newton.
Cone:
M ms :
The total mass of the moving
parts of the loudspeaker, including the air
load, in grams.
Voice coil diam:
Voice coil material:
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
Net weight:
one direction before the coil begins to
Driver Parameters
leave the magnetic gap.
Z nom (Ohms)
L e :
Inductance of the voice coil in
R evc (Ohms)
millihenries.
S d (M 2 )
SPL:
Typical sound pressure level at
BL (T/M)
1 Watt, 1 meter.
V as (liters)
n o :
Electrical-to-acoustical
F o, Hz.
conversion efficiency in percent.
C ms (uM/N)
V d :
Air displacement of the driver
M ms (gm)
from negative Xmax to positive Xmax, in
Q ms
milliliters.
Q es
P max : Maximum continuous program
Qts
power in Watts.
X max (mm)
Disp:
Volume displaced by the driver
L e (mH)
inside the cabinet when mounted on its
SPL (1W 1m)
rear flange, in inches
3
.
n o (%)
Kevlar
®
is a registered trademark of DuPont.
V d (milliliters)
Rubatex
is a registered trademark of
®
Rubatex Corporation.
Pmax (w. pgm.)
Nomex
®
is a registered trademark of
Disp in 3 / ml
DuPont.
1508-8sps
1508sps-4
1508-8cu
1508-8he
1208-8sps
00452850
00452860
00452870
00457680
00452830
15" / 380 mm
15" / 380 mm
15" / 380 mm
15" / 380 mm
12" / 305 mm
nominal
nominal
nominal
nominal
nominal
Frame OD 15-
Frame OD 15-
Frame OD 15-
Frame OD 15-
Frame OD 12-
1/4" / 387 mm
1/4" / 387 mm
1/4" / 387 mm
1/4" / 387 mm
1/4" / 311 mm
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"
370 mm, 8 holes
370 mm, 8 holes
370 mm, 8 holes
370 mm, 8 holes
295 mm, 8 holes
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"
126 mm
126 mm
126 mm
126 mm
90 mm
8 Ohms
4 Ohms
8 Ohms
8 Ohms
8 Ohms
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
500 W continuous 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,
50 Hz - 500 Hz 50 Hz - 500 Hz
50 Hz - 500 Hz
50 Hz - 500 Hz
65 Hz - 650 Hz
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 /
1 meter
1 meter
1 meter
1 meter
1 meter
35 Hz ~ 2 kHz
35 Hz ~ 2 kHz
35 Hz ~ 2 kHz
40 Hz ~ 2 kHz
50 Hz ~ 3.5 kHz
Kevlar
®
Kevlar
Kevlar
Kevlar
Kevlar
impregnated
impregnated
impregnated
impregnated
impregnated
cellulose
cellulose
cellulose
cellulose
cellulose
4.0" / 100 mm
4.0" / 100 mm
4.0" / 100 mm
4.0" / 100 mm
4.0" / 100 mm
Aluminum ribbon Aluminum ribbon
Copper ribbon
Aluminum ribbon
Aluminum ribbon
wire
wire
wire
wire
wire
Polyimide-
Polyimide-
Polyimide-
Polyimide-
Polyimide-
impregnated
impregnated
impregnated
impregnated
impregnated
fiberglass
fiberglass
fiberglass
fiberglass
fiberglass
former
former
former
former
former
Nomex
®
stiffener Nomex stiffener
Nomex stiffener
Nomex stiffener
Nomex stiffener
Solderless
Solderless
Solderless
Solderless
Solderless
diffusion welded diffusion welded
diffusion welded
diffusion welded
diffusion welded
OFHC copper
OFHC copper
OFHC copper
OFHC copper
OFHC copper
leads
leads
leads
leads
leads
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
8
4
8
8
8
5.27
3.30
5.91
5.32
5.43
0.084
0.084
0.084
0.084
0.052
15.37
12.72
20.84
16.04
15.13
185.9
163.6
199.6
182.4
54.6
41.9
45.9
36.7
51.2
56.1
158.5
163.3
199.2
182
142.2
77.6
73.5
93.9
52.9
50.7
10.357
11.197
9.314
10.604
9.513
0.457
0.433
0.295
0.352
0.448
0.437
0.417
0.286
0.341
0.428
4.7
2.3
4.7
1.9
4.7
0.418
0.211
0.583
0.336
0.359
96.7
97.5
97.2
100.3
96.9
2.9
3.6
3.3
6.7
3.1
789
386
789
319
488
1000
1000
1000
1000
1000
197 / 3229
197 / 3229
197 / 3229
197 / 3229
109 / 1797
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:
1208-4sps
00452840
FOR 1508-4/8sps:
Sealed enclosure
12" / 305 mm
May be preferred for stage monitors to control boominess and low frequency feedback on stage. F 3 is 73 Hz.
nominal
Small vented enclosure
Frame OD 12-
Excellent performance for compact, general purpose use. Warm mid-bass response. F 3 is 51 Hz.
1/4" / 311 mm
Medium vented enclosure
Terrific compromise of bass performance and enclosure size. Warm mid-bass response. F 3 is 45 Hz.
Bolt circle
Large vented enclosure
11- 5/8"
295 mm, 8 holes
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
Cutout diameter
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:
Depth 3-17/32"
Small vented enclosure
90mm
An incredibly small enclosure with outstanding bass performance for its size. F 3 is 53 Hz.
4 Ohms
Medium vented enclosure
Small box with powerful bass and predictable, flat response down to an F 3 of 45 Hz.
2000 W peak
Large vented enclosure
1000 W program
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.
500 W continuous
per AES 2-1984,
65 Hz - 650 Hz
FOR 1508-8he:
Small vented enclosure
96.6 dB 1 watt /
Small box, big voice. Very high efficiency and good bass performance in a small enclosure. F 3 is 60 Hz.
1 meter
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.
50 Hz ~ 3.5 kHz
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.
Kevlar
impregnated
FOR 1208-4/8sps:
cellulose
Sealed enclosure
4.0" / 100 mm
Excellent choice for a dedicated mid-bass/mid-range in a multiway system, or stage monitor. F 3 is 105 Hz.
Small vented enclosure
Aluminum ribbon
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.
wire
Large vented enclosure
Polyimide-
Still not all that large, with very usable bass response. Great for a compact, 2-way box. F 3 is 61 Hz.
impregnated
fiberglass
former
Nomex stiffener
1508sps
Solderless
diffusion welded
1 5 0 8 s p s s e a l e d b o x
OFHC copper
1 5 0 8 s p s s m a l l v e n t e d b o x
1 5 0 8 s p s m e d i u m v e n t e d b o x
leads
1 5 0 8 s p s l a r g e v e n t e d b o x
1 5 0 8 s p s s i n g l e r e f l e x b a n d p a s s
S P L , d B
1 0 0
16 lbs. / 7.3 kg
9 5
9 0
4
8 5
3.47
8 0
0.052
7 5
14.09
7 0
66.2
6 5
6 0
55.4
1 0 F r e q u e n c y , H z
5 0
1 0 0
Hz
5 0 0
172.5
47.9
1508he
7.085
1 5 0 8 h e s m a l l v e n t e d b o x
1 5 0 8 h e m e d i u m v e n t e d b o x
1 5 0 8 h e l a r g e v e n t e d b o x
0.311
S P L , d B
1 0 5
0.298
1 0 0
9 5
2.3
9 0
0.186
8 5
96.6
8 0
2.9
7 5
302
7 0
1000
6 5
1 0
F r e q u e n c y , H z
5 0
1 0 0
Hz
5 0 0
109 / 1797
1508-8cu
1 5 0 8 - 8 c u s m a l l v e n t e d b o x
1 5 0 8 - 8 c u m e d i u m v e n t e d b o x
1 5 0 8 - 8 c u l a r g e v e n t e d b o x
S P L , d B
1 0 0
9 5
9 0
8 5
8 0
7 5
7 0
6 5
6 0
1 0
F r e q u e n c y , H z
5 0
1 0 0
Hz
5 0 0
1 K
1 K
1208sps
1 2 0 8 s p s s e a l e d b o x
1 2 0 8 s p s s m a l l v e n t e d b o x
1 2 0 8 s p s l a r g e v e n t e d b o x
S P L , d B
1 0 5
1 0 0
9 5
9 0
8 5
8 0
7 5
7 0
6 5
1 0
F r e q u e n c y , H z
5 0
1 0 0
Hz
5 0 0
1 K
1 K
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