Infinity Kappa 104.7W Manual

Infinity Subwoofer Kappa 104.7W

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kappa series

102.7w,104.7w,

122.7w,124.7w

KAPPA SUB OM 1/24/06 11:32 AM Page 1

An optimum sealed enclosure for Kappa Series

subwoofers is always smaller than an optimum

enclosure of another type. We recommend sealed

enclosures for enthusiasts who prefer accurate

music reproduction and flat frequency response,

for those who have only a small space to devote

to a subwoofer enclosure or for those who have

plenty of amplifier power devoted to driving the

subwoofer.

Sealed-enclosure construction is straightforward

and forgiving of errors in volume calculation, but

air leaks should be avoided. Use medium-density

fiberboard (MDF), glue and screws to construct

the enclosure, and seal all joints with silicone

caulk.

VENTED ENCLOSURES

A vented enclosure acts lik sealed enclosure e a

at frequencies above the tuned (resonance)

frequency. At resonance, which is defined by

the vent, the woofer is nearly stationary while

the air inside the vent vibrates; the vent produces

the majority of sound. This condition provides

greater mechanical power handling at and

above resonance, but reduced mechanical power

handling below resonance. Since the woofer

doesn’t move much at resonance, airflow across

the voice coil is minimized and thermal power

handling is reduced slightly at resonance. Vented

enclosures provide better efficiency in the 40Hz –

60Hz range, at the expense of sound output in the

lowest octave (below 40Hz). We recommend the

use of a subsonic filter with vented enclosures.

An optimum vented enclosure for a Kappa Series

subwoofer is larger than an optimum sealed

enclosure. We recommend Infinity Kappa Series

woofers in vented enclosures for enthusiasts

who prefer accentuated bass response, for those

who have plenty of cargo space to devote to a

subwoofer enclosure and for those who will use a

less powerful amplifier to drive their subwoofers.

THANK YOU for choosing an Infinity Kappa®

Series subwoofer. Kappa Series subwoofers are

designed to suit a broad range of mobile audio

applications and can be used in a wide variety of

enclosure types to produce extended, powerful

bass in a limited amount of vehicle space. To

ensure maximum subwoofer performance, we

strongly recommend that installation be left to a

qualified professional. Although these instructions

explain how to install a Kappa Series subwoofer in

a general sense, they do not show box-construction

details and exact installation methods for your

particular vehicle. If you do not feel you have

the necessary experience, do not attempt the

installation yourself, but instead ask your

authorized Infinity car audio dealer about

professional installation options.

Remember to keep your sales receipt with this

manual in a safe place so both are available for

future reference.

LOUD MUSIC AND HEARING

Playing loud music in an automobile can hinder

your ability to hear traffic, as well as permanently

damage your hearing. The maximum volume

levels achievable with Infinity speakers, combined

with high power amplification, may exceed safe

levels for extended listening. We recommend

using low volume levels when driving. Infinity

accepts no liability for hearing loss, bodily injury,

or property damage as a result of use or misuse

of this product.

Kappa Series subwoofers are designed to

perform best in moderately sized sealed

enclosures, vented enclosures and prefabricated

bandpass enclosures. Infinite-baffle mounting

is possible, but mechanical power handling will

be reduced because there will be no volume

of air to stiffen the woofer’s suspension and

prevent overexcursion. If you choose infinite-

baffle mounting, consider the RMS and Peak

power handling ratings to be half of what is

printed in the specifications chart in this manual.

You should choose an enclosure type based on

the amount of cargo space you can devote to an

enclosure, the amount of power you will use to

drive your subwoofer(s), and your listening habits.

SEALED ENCLOSURES

The air trapped inside a sealed enclosure is

compressed when the woofer moves rearward

and is rarefied when the woofer moves forward.

In both cases, the air inside and outside the box

will seek equilibrium by pushing and pulling on

the woofer; the result is a stiffer suspension when

compared to the woofer alone. This means that

the woofer’s cone is harder to move at low

frequencies, a condition which both protects

the woofer from overexcursion and uses more

power than other designs for the same acoustic

output. A sealed enclosure and your Kappa Series

subwoofer will provide the flattest overall

response and the widest bandwidth in the

car at the expense of overall efficiency. Kappa

woofers in sealed enclosures provide usable

response below 20Hz inside a vehicle. The sealed

enclosure design indicated on the Enclosure

Design Sheet which accompanies this manual

represents the best compromise between

low-frequency extension and flat response.

Vented-enclosure construction is more difficult

than the construction of a sealed enclosure. The

enclosure volume and port dimensions have a

specific relationship with the characteristics of the

subwoofer, so the volume and port dimensions

indicated on the included Enclosure Design Sheet

must be followed precisely to ensure optimum

performance. As with sealed enclosures, use

medium-density fiberboard (MDF), glue and

screws to construct the enclosure, and seal all

joints with silicone caulk.

BANDPASS ENCLOSURES

Bandpass enclosures can provide the most output

from any amplifier and woofer combination over

a limited band of frequencies, but that additional

output comes at the expense of sonic accuracy.

If the highest sound-pressure level (SPL) is your

ONLY design goal, choose a bandpass enclosure.

The bandpass enclosure found on the included

Enclosure Design Sheet is a combination of a

sealed enclosure and a vented enclosure. The

sealed enclosure stiffens the suspension of

the woofer, just as it does in a simple sealed

enclosure, and the vented enclosure into which

the woofer outputs sound provides an acoustic

low-pass filter which attenuates high frequencies

in the woofer’s output. That attenuation of high

frequencies can make it very difficult to hear

amplifier and speaker distortion; consequently,

you may not be able to determine when the

subwoofer is in danger of being damaged.

An optimum bandpass enclosure is often

larger than an optimum vented enclosure.

We recommend bandpass enclosures only

for enthusiasts who want high SPL without

regard for sonic accuracy. If high SPL is your

goal AND you care about great-sounding

bass, choose a vented enclosure instead.

INSTALLATION ARNINGS AND IPSW T C EHOOSING AN NCLOSURE

KAPPA SUB OM 1/24/06 11:32 AM Page 2

Produkt Specifikationer

Mærke:	Infinity
Kategori:	Subwoofer
Model:	Kappa 104.7W

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