Peavey SHEFFIELD PRO 1500, SHEFFIELD PRO 1200 DATASHEET
Sheffield®Pro
™
1200 and
Sheffield Pro
1500
INTRODUCTION
The Pro 1200 and Pro 1500 drivers
are high quality, high efficiency
woofers. They are an excellent
choice for medium power subwoofer
and full-range enclosure applications
up to 400 Watts program.
PERFORMANCE
The Pro 1200 is an exceptional
performer as the low end of a twoway enclosure or a very compact,
moderate output subwoofer. Very
smooth frequency response is
combined with amazing bass
response for its size, all with good
efficiency and high sound quality.
The Pro 1500 has surprisingly
smooth and extended frequency
response, along with high efficiency
and very strong bass performance.
The 1500 delivers a solid bottom end
in a variety of enclosure designs. It is
an exceptional performer in bass
guitar and subwoofer applications.
APPLICATIONS
The Pro 1200 and Pro 1500 drivers
are excellent choices for a wide
range of sound reinforcement, highlevel playback, musical instrument,
subwoofer, and monitor applications.
Both woofers are also great choices
as replacement drivers. You can
restore top performance to your aging
instrument amps and speaker
systems with these new, high quality
loudspeakers.
The 15" driver can produce high
sound pressure levels down to 40 Hz,
while the 12" can be crossed over as
high as 4 kHz. Both drivers are
strong performers in multi-way
systems.
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.
For best results, enclosures should
be built of best-quality marine or
other high grade plywood. If you must
use construction grade plywood,
inspect each sheet thoroughly - and
do not use anything below BC grade.
Use 3/4" thick material throughout, as
thinner wood virtually guarantees
poor enclosure performance.
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
unwanted 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
SPECS
PEAVEY ELECTRONICS
ENCLOSURES Net Volume Vent diameter Vent length V
b
box tuning F3, -3 dB
cubic feet/liters (qty) inches/mm inches/mm frequency in Hz point in Hz
Sheffield®Pro™1200
Small sealed box .75/21.2 n/a n/a 93 (resonance) 75
Small vented box 1.5/42.5 (2) 3/76 7.0/178 55 56
Medium vented box 2.0/56.6 (2) 3/76 4.5/114 50 49
Large vented box 2.5/70.8 (2) 3/76 4.5/114 45 43
Single reflex bandpass Sealed 1.4/39.6
Vented 1.1/31.2 (1) 6/152 5.5/140 81 48-140
Sheffield Pro 1500
Small sealed box 1.25/35.4 n/a n/a 89 (resonance) 68
Small vented box 2.0/56.6 (2) 3/76 4.5/114 50 60
Medium vented box 3.0/85.0 (2) 3/76 4.125/105 42 50
Large vented box 4.0/113.3 (2) 3/76 3.5/89 38 45
Single reflex bandpass Sealed 2.3/65.1
Vented 1.7/48.1 (2) 6/152 8.625/219 80 43-145
Features and specifications subject to change without notice.
Peavey Electronics Corporation • 711 A Street • Meridian • MS • 39301
(601) 483-5365 • FAX (601) 486-1278 • www.peavey.com
©2001 Printed in the U.S.A. 5/01
80305006
ONE YEAR LIMITED WARRANTY
NOTE: For details, refer to the warranty statement. Copies of this
statement may be obtained by contacting Peavey Electronics
Corporation, P.O. Box 2989, Meridian, MS 39335
Suggested enclosures
For those who want to build their own enclosures, but don’t want to go through the design
process using driver parameters, Peavey provides the following optimized designs:
For Sheffield 1200:
1. Small sealed box
Incredibly small. Great choice for use in a super-compact stage monitor or as a mid-range enclosure.
2. Small vented enclosure.
Amazing portability, with high sound quality and maximum power handling. Adequate bass performance – a
great choice for the vocal range.
3. Medium vented enclosure.
Popular size for a 12" system, with an excellent mix of power handling and bass quality.
4. Large vented enclosure.
Maximum bass performance from this 12" speaker. Power handling is reduced by about 15% due to
enclosure size.
5. Single-Reflex Bandpass.
Special enclosure design that uses the enclosure as an acoustic filter for shaped response. Great choice for
a compact subwoofer system.
For Sheffield 1500:
1. Small sealed box
Tiny 15" enclosure – makes a terrific stage monitor.
2. Small vented enclosure.
Very small enclosure with strong performance and surprising bass for its size.
3. Medium vented enclosure.
An excellent blend of power handling and bass performance that works very well for general PA and bass
guitar enclosures.
4. Large vented enclosure.
Strong, extended bottom end with usable response to a solid 40 Hz. Power handling is reduced by about
15% due to the enclosure size.
5. Single-Reflex Bandpass.
Special enclosure design using the enclosure as an acoustic filter for shaped response. Great for a
subwoofer system.
Pro 1200/1500-1 5/10/01 8:28 AM Page 1
®
®
industrial 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 in your
enclosure design 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 sealed and vented
enclosures with batting such as
polyester 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.
When building a bandpass
enclosure, design a panel or door to
be removable for access to the
woofer. Use foam weatherstrip 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.
A full range of handles, protective
corners, cabinet covering, grille
materials and crossovers are
available through Peavey
Accessories.
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.
PARAMETERS
Thiele-Small parameters for
Sheffield
®
Pro™1200 and Sheffield
Pro 1500 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.
Sd: The functional radiating surface
area of the cone assembly, in
meters
2
.
BL: Efficiency of the voice coil and
magnet system in Telsa Meters.
Fo: 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.
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.
X
max:
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.
P
max
: Maximum continuous
program power in Watts.
Disp: Volume displaced by the driver
inside the cabinet when mounted on
its rear flange, in inches3.
SPECIFICATIONS
Sheffield
®
Pro™1200 Sheffield Pro 1500
Part # 00458370 00458380
Size: 12" / 305 mm nominal 15" / 380 mm nominal
Frame OD 12-1/4" / 311 mm Frame OD 15-5/32" / 385 mm
Bolt circle 11-5/8" / 295 mm, 8 holes Bolt circle 14-9/16" / 370 mm, 8 holes
Cutout diameter 11-1/16" / 281 mm Cutout diameter 14" / 356 mm
Depth 4.-7/8" / 124 mm Depth 6" / 152 mm
Impedance: 8 Ohms 8 Ohms
Power Capacity: 800 W peak 800 W peak
400 W program 400 W program
300 W continuous 300 W continuous
Sensitivity: 96.5 dB 1 Watt / 1 meter 98.0 dB 1 Watt / 1 meter
Usable Frequency Range: 50 Hz ~ 4 k Hz 40 Hz ~ 3 k Hz
Cone: Impregnated cellulose Impregnated cellulose
Voice Coil Diameter: 2.5" / 63 mm .5" / 63 mm
Voice Coil Material: 2 layers, thermally bonded copper wire 2 layers, thermally bonded copper wire
Kapton former Kapton former
Nomex stiffener Nomex stiffener
Net weight: 11 lb. / 5.0 kg 12.5 lb. / 5.7 kg
Z
nom
(Ohms) 8 8
R
evc
(Ohms) 5.58 5.54
Sd(M2) 0.0507 0.0824
BL (T/M) 11.34 12.26
Fo (Hz) 50.3 42.1
Vas(liters) 72.97 183.4
Cms(uM/N) 199.9 190.2
Mms(gm) 50.11 75.15
Q
ms
4.128 3.749
Q
es
.687 .727
Q
ts
589 .609
X
max
(mm) 3.6 3.6
Le(mH) .33 .33
SPL (1w 1m) 96.5 98
no(%) 1.31 1.82
Vd(milliliters) 365.0 593.3
P
max
(watts pgm.) 400 40
Disp (inches3)/ml 121 / 1983 196 / 3212
Kapton is a registered trademark of DuPont.
Kevlar is a registered trademark of DuPont.
Nomex is a registered trademark of DuPont.
Rubatex is a registered trademark of Rubatex Corporation.
Sealed Vented
Sheffield Pro 1200 0.
SPL, dB
100
95
90
85
80
75
70
65
60
Frequency, Hz
10
50 100 Hz 500 1K
Single Reflex Bandpass
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