Notice BLAUPUNKT VXW 300
Extrait du mode d'emploi BLAUPUNKT VXW 300
Les instructions détaillées pour l'utilisation figurent dans le Guide de l'utilisateur.
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. 8 622 401 256 5 FRANÇAIS DEUTSCH ENGLISH Basic Math Calculations To build a subwoofer box some very basic math calculations must be made accurately referencing the formulas below. [...] Disadvantages include only moderate efficiencies at low frequencies and the need for large box volumes. b) 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 movements 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. c) 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 performance and can be used with very high power amplifiers. Disadvantages include slightly lower efficiency compared to a vented box and increased complexity in box design and construction. d) 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. e) 8 622 401 256 4 ISOBARIC WOOFER CONFIGURATIONS Increasing in popularity in recent years is the compound woofer design, more commonly known as the ,,Isobaric" design. Isobaric actually means ,,constant pressure" which is the case having two woofers moving 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 space 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. [...]..
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