Pioneer DEH-P7150UB - Manual (Page 47)

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Free-Air Type Subwoofers
SEALED ENCLOSURES
From a purely musical standpoint, the sealed enclosure
type is as popular as ever. This box type is capable of
handling large amounts of power and, in turn, fairly
high SPL levels “in car”. Size always plays a key role
in application and the sealed enclosure variety is
excellent for small box applications. Power, however, is required to achieve above average
SPL levels. From a purely engineering standpoint,
the sealed box lends a “simpler is better” approach
to subwoofer application. Larger
Recommended
Smaller
VENTED ENCLOSURES (BASS REFLEX)
The vented enclosure variant is a balance between
several factors. Most notable about vented boxes is
the increase in box volume over the sealed variation.
Because the vent is considered to be a secondary
“output source”, the deeper bass frequencies can be
extended. While the distortion level above the tuning
frequency is quite low, things can get pretty dirty if the
enclosure is forced to play below this area. Efficiency and easily obtained lower frequencies would be the
biggest benefits of this design. From a purely engineer-
ing standpoint, three key elements have to be in “sync”
in order for the enclosure to work at its targeted area—
box + speaker + vent. While more complex than the
sealed variation, the vented enclosure has been a
very popular approach to car audio low-frequency
reproduction.
4TH-ORDER BAND PASS ENCLOSURES
The 4th-order band pass enclosure is basically a sealed
enclosure with the addition of a ported enclosure in
front of the driver, which acts as an acoustical filter.
The resulting system radiates sound in a limited
bandwidth. Band pass enclosures usually demonstrate
a higher sensitivity compared to sealed enclosures.
The disadvantage, however, is that it uses more trunk
space. 4th-order band pass systems are a bit more flexible in design than sealed or bass reflex enclosures,
due to the ability to change many parts of the enclosure
as front and back volume, as well as the port length.
The benefit of this is that the frequency response as
well as the sensitivity of the system can be defined more
freely compared to sealed or bass reflex enclosures.
Nevertheless, a very decent bass reproduction can
be achieved with a well-tuned system.
Larger
Recommended
Smaller Port
Sealed chamber Ported chamber
Port
Larger
Recommended
Smaller
• Spoke grille compatible (UD-G308)
• Maximum input: 1,000 W
• Spoke grille compatible (UD-G258)
• Maximum input: 800 W
TS-W258F
TS-W308F
TS-W302R
NEW
TS-W308F
30 cm (12") Component Subwoofer (Free-Air Type)
1,000 W Max.
NEW
TS-W258F
25 cm (10") Component Subwoofer (Free-Air Type)
800 W Max.
Component Subwoofers
TS-W302R
30 cm (12") Component Subwoofer
800 W Max.
Common Features
• IMPP composite cone
• Aluminum voice coil bobbin
• Single nomex damper
• Copper round wire long voice coil
• Extended and vented pole yoke
TS-W252R
25 cm (10") Component Subwoofer
600 W Max.
Subwoofer Enclosures
To have tighter control of bass power, an enclosure system is the perfect solution.
Enclosure subwoofers are designed for use in a custom-designed sealed, vented
or bandpass enclosure, the size of which is determined by specialized software. The bass response is tight, accurate, controlled and consistent, since it’s not affected
by the volume of objects in the car boot. You can put together high-performance
systems featuring superb low-frequency reproduction.
Caution: To avoid damaging your amplifier/subwoofer system, please make sure that the continuous power output of the amplifier is lower than the nominal power handling of the subwoofer.
• Nominal input: 300 W
• Nominal input: 250 W
• Maximum input: 800 W • Nominal input: 150 W
• Maximum input: 600 W • Nominal input: 120 W
Common Features
• Interlaced Aramid/Basalt fiber reinforced
IMPP composite cone
• 2-layer, copper round wire long voice coil
• Aluminum voice coil bobbin
• Single nomex damper
• Heat-resistant ABS damper ring
• Dual layer urethane surround
• Large magnet and high-power motor
assembly
• Extended and vented pole yoke
• One piece, ABS silver gasket