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 two-
way 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, high-
level 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
S P E C S
P E A V E Y
E L E C T R O N I C S
®
ENCLOSURES
Net Volume
Vent diameter
Vent length
Vb 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
