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
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
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.
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 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 kHz
40 Hz ~ 3 kHz
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
S
d
(M2)
0.0507
0.0824
BL (T/M)
11.34
12.26
Fo (Hz)
50.3
42.1
V
as
(liters)
72.97
183.4
C
ms
(uM/N)
199.9
190.2
M
ms
(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
L
e
(mH)
.33
.33
SPL (1w 1m)
96.5
98
n
o
(%)
1.31
1.82
V
d
(milliliters)
365.0
593.3
P
max
(watts pgm.)
400
40
Disp (inches
3
)/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
Single Reflex Bandpass
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
S h e f f i e l d P r o 1 2 0 0 0 .
