Cerwin-Vega IT-8.0 Manual de usuario

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 T SERIES SUBWOOFERS

For nearly 50 years, Cerwin-Vega has set the standard for

subwoofer performance worldwide. Established in 1954, Cerwin-

Vega 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. Non-

magnetic 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

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 car-

speaker 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.

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 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~Jimportrrvzfthat 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.

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”

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

Electrical 9:

Compliance Volume: V

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 (212.5mm)

3.4 R

1.24 mH

0.04 ft3 (1.13 liters)

IT SERIES SUBWOOFERS

ma0 sealed F

rrequem=YRespovrse

Normalized Amplitude Response (d&SPUHz)

cln

-6

-12

-18

-24

-30

-36 I I I llllll I I I

5HZ 10 50 100 500

Total Box Volume*: 0.4 ft3 (11.33 liters)

*Includes driver displacement of 0.04 ft3 (1.33 liters)

IT SERIES SUBWOOFERS

IT-f 0.0 Specificat ions

Diameter:

No. of Voice Coils:

Sensitivity (2.W 8 lm):

Power Handling:

(cont. unclipped power

per E/A RS-4268)

Frequency Response:

Nominal Impedance;

Voice Coil Diameter:

Mounting Diameter:

Mounting Depth:

10”

91 dB

250 Wrms

20-500 Hz

4L2

2.0”

9” (228.6 mm)

5” (117.0 mm)

IT-f 0.0 Thiele-Small Parameters

Free-Air Resonance: fs

Total Q:

Qts

Mechanical 9: Q

Electrical Q: Q

Compliance Volume: V

Maximum Excursion: X

max

Voice Coil DC Resistance: Rev,

Voice Coil Inductance: Le

Volume Displacement:

26 Hz

0.59

4.0

0.69

1.95 ft3 (55.22 liters)

1.34”

(~0.67’)

34.Omm (*17.0mm)

3.4Q

1.4 mH

0.07 ft3 (1.98 liters)

IT SERIES SUBWOOFERS

ITI10.0 Seaki F

-yRes;pourse

Normalized Amplltude Response (dB-SPL/Hz)

-6

-12

-18

-24

-36 1 I

I I1

10 60 100 500

Total Box Vo/ume*:

0.75 fts (2 1.24 liters)

*Includes driver displacement of 0.07 fP (1.98 liters)

IFiO.0 ‘cFilkf’ Sea/&d F

WY Resposrse

Normalized Amplitude Response (dBSPL/Hr)

-12

-18

Total Box Vo/ume*:

0.6 fp (17.00 liters)

*Includes driver displacement of 0.07 fP (1.98 liters)

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