Peavey 1508-8sps BWX User Manual

Page 2

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

Znom: The nominal impedance of the
driver in Ohms.

Revc: DC resistance of the driver in
Ohms. Also known as Re.

Sd:

The functional radiating surface

area of the cone assembly, in meters

BL:

Efficiency of the voice coil and

magnet system in Telsa Meters.

Fo:

Also known as Fs, the free air

resonance of the driver.

Vas:

Volume of air having the same

compliance (springiness) as the driver’s
suspension.

Cms:

Restorative force of the driver’s

suspension in micrometers/Newton.

Mms: The total mass of the moving
parts of the loudspeaker, including the air
load, in grams.

Qms: Resonance characteristics of the
mechanical factors of the loudspeaker.

Qes:

Resonance characteristics of

electrical factors of the loudspeaker.

Qts:

Resonance characteristics of the

electrical and mechanical factors
combined together.

Xmax: Distance the cone can move in
one direction before the coil begins to
leave the magnetic gap.

Le:

Inductance of the voice coil in

millihenries.

SPL:

Typical sound pressure level at

1 Watt, 1 meter.

no:

Electrical-to-acoustical

conversion efficiency in percent.

Vd:

Air displacement of the driver

from negative Xmax to positive Xmax, in
milliliters.

Pmax: Maximum continuous program
power in Watts.

Disp:

Volume displaced by the driver

inside the cabinet when mounted on its
rear flange, in inches

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. F3 is 73 Hz.
Small vented enclosure
Excellent performance for compact, general purpose use. Warm mid-bass response. F3 is 51 Hz.
Medium vented enclosure
Terrific compromise of bass performance and enclosure size. Warm mid-bass response. F3 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. F3 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. F3 is 53 Hz.
Medium vented enclosure
Small box with powerful bass and predictable, flat response down to an F3 of 45 Hz.
Large vented enclosure
Strong, flat response with bass extension to an F3 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. F3 is 60 Hz.
Medium vented enclosure
Super-high efficiency in a popular enclosure size. F3 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 F3 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. F3 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. F3 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. F3 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

12" / 305 mm

nominal

Frame OD 15-

Frame OD 12-

1/4" / 387 mm

1/4" / 311 mm

Bolt circle

14-9/16"

11- 5/8"

370 mm, 8 holes

295 mm, 8 holes

Cutout diameter Cutout diameter

Cutout diameter

14" / 356 mm

10 15/16" / 278 mm 10 15/16" / 278 mm

Depth 4-31/32"

Depth 3-17/32"

126 mm

90 mm

90mm

Impedance:

8 Ohms

4 Ohms

8 Ohms

4 Ohms

Power Capacity:

2000 W peak

1000 W program 1000 W program

1000 W program

500 W continuous 500 W continuous

500 W continuous

per AES 2-1984, per AES 2-1984,

per AES 2-1984,

50 Hz - 500 Hz 50 Hz - 500 Hz

50 Hz - 500 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

Usable

frequency range:

35 Hz ~ 2 kHz

40 Hz ~ 2 kHz

50 Hz ~ 3.5 kHz

Cone:

Kevlar

impregnated

cellulose

Voice coil diam:

4.0" / 100 mm

Voice coil material:

Aluminum ribbon Aluminum ribbon

Copper ribbon

Aluminum ribbon

wire

Polyimide-

impregnated

fiberglass

former

Nomex

stiffener Nomex stiffener

Nomex stiffener

Solderless Solderless

Solderless

diffusion welded diffusion welded

diffusion welded

OFHC copper

leads

Net weight:

17 lbs. / 7.7 kg 17 lbs. / 7.7 kg

17 lbs. / 7.7 kg

16 lbs. / 7.3 kg

Driver Parameters

Znom(Ohms)

Revc (Ohms)

5.27

3.30

5.91

5.32

5.43

3.47

Sd (M2)

0.084

0.052

BL (T/M)

15.37

12.72

20.84

16.04

15.13

14.09

Vas (liters)

185.9

163.6

199.6

182.4

54.6

66.2

Fo, Hz.

41.9

45.9

36.7

51.2

56.1

55.4

Cms (uM/N)

158.5

163.3

199.2

182

142.2

172.5

Mms (gm)

77.6

73.5

93.9

52.9

50.7

47.9

Qms

10.357

11.197

9.314

10.604

9.513

7.085

Qes

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

Xmax (mm)

4.7

2.3

4.7

1.9

4.7

2.3

Le (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

no (%)

2.9

3.6

3.3

6.7

3.1

2.9

Vd (milliliters)

789

386

789

319

488

302

Pmax (w. pgm.)

1000

Disp in3 / ml

197 / 3229

109 / 1797

1 0

F r e q u e n c y , H z 5 0 1 0 0 Hz 5 0 0 1 K

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 5 0 8 s p s s e a l e d b o x

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

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

1 0

F r e q u e n c y , H z

5 0 1 0 0 Hz 5 0 0 1 K

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 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

1508sps

1508-8cu

1 0

F r e q u e n c y , H z

5 0 1 0 0 Hz 5 0 0 1 K

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 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

1 0

F r e q u e n c y , H z 5 0 1 0 0 Hz 5 0 0 1 K

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 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

1508he

1208sps

Kevlar

is a registered trademark of DuPont.

Rubatex

is a registered trademark of

Rubatex Corporation.
Nomex

is a registered trademark of

DuPont.

This manual is related to the following products:

1508-8he BWX 1208-4sps BWX 1508-4sps BWX 1208-8sps BWX