Bedienungsanleitung JBL Club WS1200 (Seite 3 von 56) (Alle Sprachen)

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VENTED ENCLOSURES

A vented enclosure acts like a sealed

enclosure at frequencies above its tuned

(resonance) frequency. At resonance

(which is defined by the vent), the vent

produces the majority of sound – the

subwoofer cone is nearly stationary while

the air inside the vent vibrates. This

provides greater mechanical power

handling at and above resonance, but

reduced mechanical power handling below

resonance. Since the subwoofer cone and

voice coil don’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). The use of an

infrasonic filter is recommended with

vented enclosures. An optimum vented

enclosure for a Club Series subwoofer is

larger than an optimum sealed enclosure.

See accompanying data sheet for specific

enclosure dimension requirements.

VENTED-ENCLOSURE PERFORMANCE

ADVANTAGES

• An optimum vented enclosure has

greater efficiency and higher output in

the 40Hz – 60Hz range than an optimum

sealed enclosure.

• An optimum vented enclosure provides a

greater sensation of bass than an

optimum sealed enclosure.

• A Club WS1000 or WS1200 subwoofer in

an optimum vented enclosure will

require less amplifier power to achieve

a given acoustic output (down to the

enclosure’s resonance frequency) than

in an optimum sealed enclosure.

BAND-PASS ENCLOSURES

Band-pass enclosures can provide the

most output from any amplifier and

subwoofer combination over a limited

band of frequencies, but that additional

output comes at the expense of sonic

accuracy. Band-pass enclosures combine

a sealed or vented enclosure that houses

the subwoofer along with a vented

chamber into which the subwoofer

outputs its sound. The vented chamber

acts as an acoustic low-pass filter which

attenuates high frequencies in the

subwoofer’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.

See accompanying data sheet for specific

enclosure dimension requirements.

BAND-PASS-ENCLOSURE PERFORMANCE

ADVANTAGES

• An optimum band-pass enclosure

provides higher output over a limited

bandwidth than an optimum enclosure of

any other type.

BAND-PASS-ENCLOSURE PERFORMANCE

TRADE-OFFS

• Band-pass enclosures achieve high

output at the expense of sonic

accuracy.

• An optimum band-pass enclosure has a

more limited bandwidth than an

optimum enclosure of any other type.

• The enclosure’s low-pass filter

characteristics can make it difficult to

hear if the subwoofer is in danger of

being damaged.

• An optimum band-pass enclosure is

usually larger than an optimum vented

enclosure.

BAND-PASS-ENCLOSURE CONSTRUCTION

Band-pass-enclosure construction is more

difficult than vented-box construction

and, as with vented enclosures, the

design parameters for the vented section

must be followed carefully. (The sealed

section is more forgiving of small design

and construction variations.) Fortunately,

there are many prefabricated band-pass

enclosures that are designed to extract

the most output possible from nearly any

subwoofer. Prefabricated band-pass

enclosures are strongly recommended if

you must have a band-pass enclosure. If

you choose to build your own band-pass

enclosure, use medium-density fiberboard

(MDF), glue and screws to construct the

enclosure,and be sure to seal all joints

with silicone caulk.

THE JBL RECOMMENDATION

Band-pass enclosures are recommended

only for enthusiasts who want high

sound-pressure levels (SPL) without

regard for sonic accuracy. If high SPL

AND great-sounding bass are your goals,

choosing a vented enclosure is

recommended instead.

VENTED-ENCLOSURE PERFORMANCE

TRADE-OFFS

• Reduced output in the lowest octave

(below 40Hz).

• Reduced mechanical power handling

below the enclosure’s resonance

frequency. The use of an electronic

infrasonic filter is strongly recommend-

ed, to reduce the chance of overdriving

the subwoofer below the enclosure’s

resonance frequency.

• An optimum vented enclosure will

always be larger than an optimum

sealed enclosure.

VENTED-ENCLOSURE CONSTRUCTION

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 physical and electromechanical

characteristics of the subwoofer,

requiring that the recommended

enclosure volume and port characteris-

tics be strictly observed. As with sealed

enclosures, use medium-density

fiberboard (MDF), glue and screws to

construct the enclosure, and seal all

joints with silicone caulk.

THE JBL RECOMMENDATION

Club WS1000 and WS1200 subwoofers in

vented enclosures are recommended 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

subwoofer. The volume and port

dimensions indicated on the included

technical data sheet must be followed

precisely to ensure optimum

performance.

CLUB SUBWOOFERS

WS1000 and WS1200

JBL Club WS1200 Seite 3

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