Bedienungsanleitung Blaupunkt vw 300 (Seite 3 von 38) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Portugiesisch, Spanisch, Schwedisch)

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COMMON ENCLOSURE TYPES

In the car audio world there are five types of subwoofer enclosures commonly used: INFINITE

BAFFLE, SEALED BOX (closed box), VENTED BOX (bass reflex), SINGLE-VENTED BANDPASS

(often incorrectly referred to as “5th” order), DUAL-VENTED BANDPASS (often incorrectly referred

to as “7th” order). No single design is superior because each has its own compromise in performance,

power handling and design complexity. The bandpass name implies a “built-in” acoustical response

which has a natural highpass response (30 Hz for example) but also a lowpass response suppressing

high frequencies (e.g., > 80 Hz).

INFINITE BAFFLE (fig. a) designs simply use the trunk of the car for

its acoustical enclosure and the rear deck to isolate the front and rear

sound paths. Advantages include simple installation and adequate

performance for most systems. Disadvantages include poor power

handling capacity and substandard transient response.

SEALED boxes (fig. b) offer one of the best compromises in power

handling and performance. Because of the “air spring” provided by the

box the advantages include simple box construction, higher power

handling, excellent transient response, and smooth low frequency roll-

off. Disadvantages include only moderate efficiencies at low frequen-

cies and the need for large box volumes.

VENTED boxes (fig. c) extend the low frequency response below that

of the sealed box by using a port tube. Advan-tages include extended

low frequency response, lower distortion due to smaller cone move-

ments in its passband, good efficiency, good transient response,

moderate size boxes and higher power capacity. Disadvantages

include increased complexity in box design and possible woofer

damage due to over-excursion of the woofer cone below the cut-off

frequency of the vented box.

SINGLE-VENTED BANDPASS boxes (fig. d) are relatively new

(about 5 years in the car) but offer some advantages of both the sealed

and vented designs. Advantages include reasonable efficiency, small

box volumes, good transient response, extended low frequency per-

formance and can be used with very high power amplifiers. Disadvan-

tages include slightly lower efficiency compared to a vented box and

increased complexity in box design and construction.

DUAL-VENTED BANDPASS boxes (fig. e) vent the sound from the

front and back of the woofer through individually tuned enclosure on the

front and rear of the woofer. The advantage of this design is its high

efficiency over a narrow frequency band. Disadvantages include

complex design and construction, large box volumes, poor transient

response and susceptibilities to cone over-excursions (damage) for

sound outside its primary frequency band.

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