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Infinity Subwoofer Beta 12

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CAR AUDIO

Thank you for purchasing an Infinity Beta Twelve

12" Subwoofer. You’ve selected a premium product

that offers superior performance and advanced

materials, resulting from over 25 years of loud-

speaker design. This Infinity product is made with

our ongoing dedication to create the best consumer

audio products possible. As a result, you can expect

your new Beta Subwoofer to provide you with many

years of listening enjoyment.

We have included three enclosure types — sealed,

vented, and single-reflex bandpass —with three dif-

ferent alignments (i.e., tuning preferences) for each

box. Please refer to the discussion in Subwoofer

Enclosure Trade-Offs and associated performance

graphs (on the inside pages) to select a desired

enclosure type and alignment.

Each Infinity Beta Twelve 12" Subwoofer is covered

by our full three-year parts and labor warranty (see

back page). Keep your original dated bill of sale in

case warranty service is required.

IMPORTANT: Installation of automotive stereo

components can require extensive experience in

dealing with a variety of electrical, and

mechanical procedures, including subwoofer

box building. Although these instructions

explain how to install a Beta Subwoofer in a

general sense, they do not show the exact instal-

lation methods for your particular vehicle. If

you do not have the experience, do not attempt

the installation yourself; instead ask your

Authorized Infinity Car Audio Dealer about

professional installation options.

PRECAUTIONS

• Always wear protective eyewear when using tools.

• Turn off all audio systems and other electrical

devices before starting the installation.

• Disconnect the (–) negative lead from your vehi-

cle’s battery.

• Locate and note all fuel lines, hydraulic brake

lines, and electrical wiring. Use extreme caution

when cutting or drilling in and around these areas.

• Check clearances on both sides of a planned

mounting surface before drilling any holes or

installing any screws.

T PHIELE-SMALL ARAMETERS

REE

-A

ESONANCE

: F

) 22.00

OMPLIANCE

OLUME

: V

(

3) 5.60

(

LITERS

) 158.00

ECHANICAL

Q: Q

7.88

LECTRICAL

Q: Q

0.25

OTAL

Q: Q

0.25

AXIMUM

XCURSION

: X

MAX

(

) 0.39

MAX

(

) 10.00

OICE

OIL

ESISTANCE

: R

(

OHMS

) 2.80

SPECIFICATIONS

IAMETER

: 12" (304.8

)

ENSITIVITY

(2.83 V @ 1

): 94 dB

OWER

ANDLING

: 275 W

RMS

REQUENCY

ESPONSE

: 20 ~ 400 H

OMINAL

MPEDANCE

: 4

OHMS

IMENSIONS

LIMITED WARRANTY

THREE YEARS

Beta Series Automotive Speakers, Electronics

HOW LONG IS THIS WARRANTY?

This warranty remains in effect for three years from date of purchase.

WHO IS PROTECTED BY THIS WARRANTY?

This warranty protects the original owner and is not transferable, providing that the product has been pur-

chased in the United States. The original dated bill of sale from an authorized Infinity dealer must be present-

ed whenever warranty service is required. For warranty service outside the United States, contact the Infinity

distributor in the country where the product was purchased.

WHAT IS COVERED BY THIS WARRANTY?

Except as specified below, this warranty covers all defects in materials and workmanship. The following are

not covered: damage caused by accident, misuse, abuse, product modification or neglect, damage occurring

during shipment, damage from failure to follow instructions contained in the instruction manual, damage

resulting from the performance of repairs by someone not authorized by Infinity, or any claims based on mis-

representations by the seller. This warranty does not cover incidental or consequential damages. It does not

cover the cost of removing or reinstalling the unit.

You are responsible for transporting your product for repair. However, Infinity will pay return charges if the

repair is covered under warranty. Outside the United States, please contact your local distributor.

This warranty gives you specific legal rights. You may also have other rights which vary from state to state.

Some states do not allow the exclusion or limitation of incidental or consequential damages or limitations on

how long an implied warranty lasts, so the above may not apply to you.

PLEASE MAKE NOTE OF THE FOLLOWING

INFORMATION AND RETAIN FOR YOUR RECORDS:

Product Name: __________________________________ Model Number:_____________________________________

Store Name And Phone: _______________________________________________________________________________

Date of Purchase: _____________________________________________________________________________________

Infinity Systems, Inc. • 20630 Nordhoff Street

Chatsworth, CA 91311, USA •VOICE (818) 407- 0228 • FAX (818) 709 - 9486

Infinity Systems, Inc. • 20630 Nordhoff Street

Chatsworth, CA 91311, USA •VOICE (818) 407- 0228 • FAX (818) 709 -9486

mounting depth

5.875" (149.23 mm)

cutout diameter

11.38" (289.05 mm)

outer diameter

12.95" (328.93 mm)

Printed In Japan

Twelve 12 " S u b w o o f e r

I N S T R U C T I O N S

BETA WELVET VENTED NCLOSUREEBETA WELVET SEALED NCLOSUREE

VBOX = Box Volume

(see responses below)

Beta Twelve

(side view)

Port

D = diameter

(see responses

below)

L = length

(see responses

below)

dB (Normalized)

Freq.

(Hz)

100 50050 1k

Beta Twelve Vented Enclosure – Flat Response

-30

-20

-10

Free-Field

VBOX*= 1.25 ft 3

L = 15.00"

D = 4.00"

Close-Field

(In Car)

dB (Normalized)

Freq.

(Hz)

100 50050 1k

Beta Twelve Vented Enclosure – Enhanced Response

-30

-20

-10

Free-Field

Close-Field

(In Car)

VBOX*= 2.50 ft3

L = 3.70"

D = 4.00"

dB (Normalized)

Freq.

(Hz)

100 50050 1k

Beta Twelve Vented Enclosure – Extended Response

-30

-20

-10

Free-Field

Close-Field

(In Car)

VBOX*= 1.75 ft3

L = 17.20"

D = 4.00"

VBOX = Box Volume

(see responses below)

Beta Twelve

(side view)

dB (Normalized)

Freq.

(Hz)

100 50050 1k

Beta Twelve Sealed Enclosure – Flat Response

-30

-20

-10

Free-Field

Close-Field (In Car)

VBOX*= 0.75 ft3

dB (Normalized)

Freq.

(Hz)

100 50050 1k

Beta Twelve Sealed Enclosure – Enhanced Response

-30

-20

-10

Free-Field

Close-Field (In Car)

VBOX*= 0.50 ft3

dB (Normalized)

Freq.

(Hz)

100 50050 1k

Beta Twelve Sealed Enclosure – Extended Response

-30

-20

-10

Free-Field

Close-Field (In Car)

VBOX*= 1.20 ft3

BETA WELVET SINGLE EFLEX ANDR B -PASS NCLOSUREE

VBOXR = Box Volume Rear

(see responses below)

VBOXF = Box Vol. Front

(see below)

Beta Twelve

(side view)

Port

D = diameter

(see responses

below)

L= length

(see

responses

below)

dB (Normalized)

Freq.

(Hz)

100 50050 1k

Beta Twelve Band-Pass Enclosure – Flat Response

-30

-20

-10

Free-Field

Close-Field (In Car)

VBOXF*= 0.70 ft3

VBOXR*= 0.75 ft 3

L = 6.20 "

D = 4.00 "

dB (Normalized)

Freq.

(Hz)

100 50050 1k

Beta Twelve Band-Pass Enclosure – Enhanced Response

-30

-20

-10

Free-Field

Close-Field (In Car)

VBOXF*= 0.70 ft3

VBOXR*= 0.65 ft 3

L = 5.30"

D = 4.00"

dB (Normalized)

Freq.

(Hz)

100 50050 1k

Beta Twelve Band-Pass Enclosure – Extended Response

-30

-20

-10

Free-Field

Close-Field (In Car)

VBOXF*= 1.00 ft3

VBOXR*= 1.10 ft 3

L = 5.90"

D = 4.00 "

S E TUBWOOFER NCLOSURE RADE OFFS-

Subwoofer enclosures are classified as sealed (acoustic

suspension) or ported (bass-reflex), and can be built in

many configurations. Here we discuss three popular box

types and encourage you to compare their response

curves, noting the differences in Beta Twelve output

level and frequency response versus volume in sealed,

vented, and single-reflex band-pass enclosures.

A sealed enclosure is the smallest and simplest to build,

with high power handling, good phase coherence, and

the most predictable response, at the expense of some-

what diminished sound output. If amplifier power is not

a concern, this is the best choice for most systems, pro-

viding the highest output at the lowest frequencies.

A vented enclosure adds a port (or vent) tuned to the

speaker’s resonance in the box to help boost sound out-

put by “tuning” the rear sound waves so they add to the

front ones. It is more efficient than a sealed box above

the tuned frequency, but more difficult to build properly.

For frequencies below the tuned range, output is less-

ened due to sound cancellation, and there is a 180-

degree phase shift at the tuned frequency. Other draw-

backs are the increased box size for the added port and

diminished power handling due to woofer over-excur-

sion at frequencies below the tuned frequency.

A single-reflex band-pass enclosure counteracts the

sound cancellation properties in vented designs by iso-

lating the subwoofer from the port within its own enclo-

sure. It offers higher power handling, and an automatic

band-pass response to help roll off higher frequencies.

However, it has a 180-degree phase shift at the tuned

frequency. Also, complexity and size are increased, due to

separate front and rear chambers, and it requires

adding substantial midbass drivers elsewhere in the car.

We recommend a sealed enclosure for the Beta Twelve.

Depending on your taste in music, you can select a box

volume for a flat, enhanced, or extended bass response

(see graphs on right). The flat response is optimum for

all enclosures and types of music. The enhanced sealed

box provides a “tighter” bass, great for rock and rap. An

enhanced vented box has increased output, but with

diminished transient response and power handling. The

extended sealed box is more efficient at the lowest fre-

quencies, providing added bass boost for jazz and classi-

cal music, but with diminished power handling. The

extended response curve provides the best power han-

dling for vented enclosures.

For more help, please call Infinity technical support at:

(800) 553-3332 *If filling is desired, reduce box volume by 20%. *If filling is desired, reduce box volume by 20%. *If filling is desired, reduce box volume by 20%.