Cerwin-Vega IT-8.0, IT-10.0, IT-12.0, IT-15.0 User Manual
IT
SERIES
SUBWOOFERS
Attention!
PLEASE READ ALL WARNINGS FOUND IN THIS MANUAL.
THIS
INFORMATION IS HIGHLIGHTED IN BOLD ITALIC TYPE AND IS INCLUDED
TO INFORM YOU OF THE POTENTIAL FOR PERSONAL INJURY OR
DAMAGE TO PROPERTY.
Hearing Damage
CONTINUOUS, EXCESSIVE EXPOSURE TO SOUND PRESSURE
LEVELS IN EXCESS OF 85 dB CAN CAUSE A LOSS OF HEARING. CERWIN-
VEGA IT SERIES COMPONENTS ARE CAPABLE OF PRODUC/NG SOUND
PRESSURE LEVELS GREATER THAN 85 dB.
Volume and Driver Awareness
USE OF INTENSE TECHNOLOGY SERIES SUBWOOFERS CAN IMPAIR
YOUR ABILITY TO HEAR NECESSARY TRAFFIC SOUNDS AND MAY
CONSTITUTE A HAZARD WHILE DRIVING. WE RECOMMEND USING LOW
VOLUME LEVELS WHEN DRIVING YOUR VEH/CLE.
CERWIN-VEGA ACCEPTS NO LIABILITY FOR HEARING LOSS,
BODlLY INJURY, OR PROPERTY DAMAGE AS A RESULT OF USE OR
MISUSE OF THlS PRODUCT.
Installation Warning
USE EXTREME CAUTION WHEN TIGHTENING MOUNTING SCREWS,
AS SCREW HEADS CAN CATCH ON THE SURROUND AND CAUSE
DELAMINATION OF THE SPEAKER ASSEMBLY.
Cerwin-Vega is constantly striving to maintain the highest consumer standards. As a result of these efforts, modifications may
be made from time to time to existing products without prior notice. Specifications and appearance may differ from those listed
or shown in this manual. Cerwin-Vega is a registered trademark of Cerwln-Vega, Inc Dacron and Nomex are registered
trademarks of E.I. Du I’ont De Nemours & Co., Inc.
i
I T SERIES SUBWOOFERS
For nearly 50 years, Cerwin-Vega has set the standard for
subwoofer performance worldwide. Established in 1954, CerwinVega was designing subwoofers before most competitors’ engineers
were born. Cerwin-Vega’s goal is to reproduce and even improve the
live musical experience. To this end, we have pioneered a design
philosophy which combines high efficiency with high power
handling, resulting in performance unequaled in dynamic capability.
Dynamics are, first and last, fundamental to the very purpose of
sound reproduction:
“To provide the listener with the highest order
of artistic and subjective resemblance to the condition of a live
rendition.”
Intense TechnologyTkl (IT) competition subwoofers are
designed for optimum performance in small sealed enclosures with
low frequency accuracy without sacrificing output. Each IT
subwoofer utilizes new engineering concepts and technological
innovations such as:
Infused Kevlar and Crystalline Oxide Fiber Cone with
Polypropylene Coating: Extremely rigid and strong with
exceptionally fast transient performance for “tight” natural
sounding bass and low distortion even at high power levels.
Natural Butyl Rubber Surround: Outstanding linearity under
hard drive/high power applications. Long throw with minimum
cone “drift” results in wide dynamic range and low distortion.
Resists ultraviolet radiation.
Nomex’r”’ Spider Material: Vastly stronger than conventional
cloth. Resists tearing or warping under high power conditions
for improved long-term reliability.
Deep-Draw Diecast Frame: More rigid than stamped steel so
frame distortion and resonances are effectively eliminated. Nonmagnetic so all the magnetic energy is used to tightly control the
diaphragm for increased output with prolonged reliability. High
efficiency combines with excellent transient response and
acoustic definition.
Proprietary Integrated Dust Dome: Dust dome is designed as a
7
IT
SERIES
SUBWOOFERS
structural member of the cone body for greater cone integrity.
Lower distortion even under extreme loading conditions.
Unitized Magnetic Circuit: Monolithic pole piece/back plate
construction for maximum magnetic efficiency.
Oversized Voice Coils: Hand crafted 3” (12/15”) and 2” (S/lo”)
voice coils wound with precision Swiss wire for high power
handling. Consistent and outstanding performance over the
long-term.
High Energy Strontium Ferrite Magnet: Intense flux density with
greater than a 10% increase over conventional strontium ferrite
magnetic materials for high efficiency and greater control with
fast transient response.
Deep Groove Backplate: Extended voice coil excursion capability
for increased mechanical power handling resulting in enhanced
reliability as well as higher output.
Vented Pole: Effectively transfers heat away from voice coil for
improved thermal power handling and reliability.
About This Manual
This manual covers enclosure information for the ITS.O/lO.O/
12.0/15.0 subwoofers. We assume you have a good knowledge of carspeaker installation techniques, including subwoofer box construction.
If not, please consult your authorized Cerwin-Vega mobile audio
dealer for installation options.
Warranty information
Your IT subwoofer is covered by Cerwin-Vega’s limited
one-year warranty. Please read the enclosed warranty card for all
the details.
2
IT
SERIES
SUBWOOFERS
Table of Contents
Safety Warnings
introduction
Table of Contents
Applications
IF8.0 SpecificationslThiele-Small Parameters
5
W8.0 Sealed Enclosure Recommendations 6
IrIO. Specificationsflhiele-Small Parameters
7
IWO.0 Sealed Enclosure Recommendations 8
IT-120 Specificationsflhiel-Small Parameters
Irl2.0 Sealed Enclosure Recommendations
IT-15.0 SpecificationslThiele-Small Parameters
/T-15.0 Sealed Enclosure Recommendations
i
f
3
4
9
10
3
I T
SERIES
SUBWOOFERS
Applications
The Cerwin-Vega IT Series subwoofers are specifically
designed to be used in small sealed enclosures for optimum
performance with long-term reliability. Thevery low resonance
frequency of each IT subwoofer results in tight, well-controlled bass
where space is limited.
Caution: By definition subwoofers with a low resonantfrequency
designed for small sealed enclosures have a very compliant (soft)
mechanical suspension system. Consequently, high power
application ijz enclosures which are larger than the recommended
volume could result in mechanical damage to the woofer.
For best results, at minimum we recommend lining all inside
box walls with acoustic fiberglass or DacronT” fiberfill of one-inch
thickness. By loosely filling the enclosure (see figures in “enclosure
recommendations”) the enclosure with acoustic fiberglass or
DacronTM fiberfill, the enclosure volume may be reduced by lo-15943
yielding the same results. It is ZW~J importrrvzf that the box have no air
leaks. The more rigid and well-sealed the enclosure, the more
accurate and controlled the bass response. Remember that with small
sealed enclosures, dimension tolerances are highly critical. Please
pay particular attention
that
internal box dimensions match those
recommended in this manual.
The final box shape should be determined by individual space
considerations. Although the shape of the box is not critical to
performance, the length, width, and depth of the box should all be
different dimensions. This prevents common mode resonance that
can occur in the walls of the enclosure. Optimum performance is
achieved when the ratio of the wall dimensions are 1.25 x 1 x 0.8 or
1.66 x 1 x 0.6. These are known as the “golden ratios.” Under no
circumstances should the box be made in a “cube” shape with all
sides equal.
In applications which require multiple woofers, we
recommend a common cavity for each “pair” of woofers. This is
achieved by doubling the recommended enclosure volume. The
woofers should be physically positioned as close together as possible
to create an acoustic “coupling” of the two woofers, which will result
in an increase in output level.
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IT
SERIES
SUBWOOFERS
1F8.0 Specifications
Diameter:
No. of Voice Coils:
Sensitivity (2.8V 8 7m) :
Power Handling:
(cont. unclipped power
per HA RS-4266)
Frequency Response:
Nominal Impedance:
Voice Coil Diameter:
Mounting Diameter:
Mounting Depth:
8”
1
89 dB
200 Wrms
25-500 Hz
4fi
2.0”
7” (177.8 mm)
4.375” (111.2 mm)
1F8.0 Thiele-Small Parameters
Free-Air Resonance:
fs
Total 9:
Qts
Mechanical 9:
0
ms
Electrical 9:
Q
es
Compliance Volume:
V
as
Maximum Excursion:
X
max
Voice Coil DC Resistance: Rev=
Voice Coil Inductance:
Le
Volume Displacement:
33 Hz
0.43
3.7
0.49
0.64 ft3 (18.12 liters)
1.00” (*0.50’)
25.0 mm (2 12.5 mm)
3.4 R
1.24 mH
0.04 ft3 (1.13 liters)
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