Bedienungsanleitung Blaupunkt vxw 300 velocity (Seite 5 von 23) (Deutsch, Englisch, Französisch)

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ISOBARIC WOOFER CONFIGURATIONS

Increasing in popularity in recent years is the com-

pound woofer design, more commonly known as the

„Isobaric“ design. Isobaric actually means „constant

pressure“ which is the case having two woofers mo-

ving an encapsulated pocket of air between them in

the same direction.

This arrangement acts like a single speaker which

effectively reduces the required box volumes for a

subwoofer system by 50% which is substantial if you

are space-limited. Unfortunately, the trade-off for spa-

ce is the 3 dB loss in efficiency but this is usually

recovered with increased amplifier power. Care must

be taken to avoid air leaks between the two woofers

and final speaker wiring and impedance loads must

be carefully watched.

SUBWOOFER ENCLOSURE CONSTRUCTION

Before starting final box assembly some basic construction issues should be mentioned:

- Infinite baffle construction in a car is done by simply cutting a piece of wood which will act as an

acoustical divider isolating the front and rear sound of the woofer. This piece of wood is mounted inside

the trunk of the car under the rear deck, or against the back of the rear seat, and should have some

kind of caulking to seal off all residual air leaks.

- Box construction can take on nearly any shape since we are dealing with low frequencies. Odd

shapes that are difficult to cut and glue should be avoided.

- Particle board, MDF, or high grade birch plywood are good materials to build boxes of thicknesses

of 19 to 25 mm.

- All seams in the box should be glued, screwed and caulked to prevent wall separation over time

due to vibration and environmental changes within the car.

- Cross bracing is important for large boxes to prevent wall vibration.

- Acoustical damping material (sheep wool or fibre-glass batting 5 to 10 cm thick), attached to 50%

or more of the interior walls helps reduce box noise and also increases the box volume seen by the

woofer by 10 - 20%. The application of self-adhesive damping mats to the inside walls also helps to

eliminate wall resonances.

- The cables running from the amplifier to the subwoofer should be as short as possible with a cable

cross section of at least 4 mm2.

- The final box should be rock solid and air tight but should also remain serviceable should a woofer

be damaged for any reason.

- When possible, use 10 to 15 cm diameter port tubes to avoid wind noise from smaller diameter

sizes. PVC plumbing pipe in various diameters is available at most hardware stores with „elbow“ pipes

allowing you to bend the tubes inside the box.

- Try to always use active (electronic) crossovers, such as those built into our Velocity amps, for

example.

SERIES

PARALLE

SERIES

PARALLE

ISOBARIC CONFIGURATION (TANDEM)

8 622 401 256

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