VELOCITY VW 250 - BLAUPUNKT - Free user manual and instructions

USER MANUAL VELOCITY VW 250 BLAUPUNKT

Thanks for choosing Blaupunkt ! Congratulations on your purchase of your new Blaupunkt Velocity-Series subwoofers. We have invested tremendous effort in the design process of the new Blaupunkt Velocity-Series subwoofers. Reference series, in order to achieve superior musical performance. For maximum performance and reliability we highly recommend that your new Blaupunkt VelocitySeries subwoofers be installed by an authorised Blaupunkt dealer. By using our Blaupunkt VelocitySeries component speakers and amplifiers you can be assured of making the best out of your highquality audio hi-fi system without spoiling the sound by using components of inferior quality. For additional information on the Blaupunkt Product Line (technical data, user notes and soon also a simulation programme for subwoofer housings) visit our Internet site at: http://www.blaupunkt.com We provide a manufacturer guarantee for our products bought within the European Union. You can view the guarantee conditions at www.blaupunkt.de or ask for them directly at: Blaupunkt GmbH Hotline Robert-Bosch-Str. 200 31139 Hildesheim Germany

Before starting to mount your speakers, please read carefully the instructions on installation and connection. Disconnect the negative terminal of the battery before carrying out installation and connection work. Observe the vehicle manufacturer’s safety instructions (regarding airbags, alarm systems, trip computers, vehicle immobilisers). When drilling holes, take care to avoid damage to vehicle components (battery, cables, fuse boxes). Do not mount the subwoofer onto flexible rear decks (hatchback vehicles) or anywhere where they may fall forward.

SUBWOOFER ENCLOSURE TYPES Sound is created by the movement of the woofer cone back and forth. If a woofer cone moves forward creating a positive pressure wave, this same motion creates a negative pressure at the back of the woofer. If these two waves combine due to the lack of a wall separating the front of the speaker sound from the back, the output from the woofer is effectively cancelled thus substantially reducing the bass output of the speaker. This wall is absolutely necessary and is referred to as an acoustical “baffle”. It can be accomplished using a box of some kind or simply the rear package shelf of an automobile to isolate the front and back waves of the speaker.

FRONT PLATE FRAME SURROUND CONE YOKE VENT DUST CAP VOICE COIL MAGNET SPIDER 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. a)

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 rolloff. Disadvantages include only moderate efficiencies at low frequencies 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 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.

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.

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.

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.

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 fibreglass 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.

D CONE YOKE VENT DUST CAP VOICE COIL MAGNET SPIDER

CONE YOKE VENT DUST CAP VOICE COIL MAGNET SPIDER CONE YOKE VENT DUST CAP VOICE COIL MAGNET SPIDER CONE YOKE VENT DUST CAP VOICE COIL MAGNET SPIDER

CONE YOKE VENT DUST CAP VOICE COIL MAGNET SPIDER CONE YOKE VENT DUST CAP VOICE COIL MAGNET SPIDER CONE YOKE VENT DUST CAP VOICE COIL MAGNET SPIDER CONE YOKE VENT DUST CAP VOICE COIL MAGNET SPIDER ENGLISH Recycling and disposal

Our products are made from materials that can be disposed of in an environmentally sensitive manner and are suitable for appropriate recycling. Products that are to be scrapped must be collected separately from household waste. To dispose of the product, please use the available waste return and collection systems.

10" SUBWOOFER • TECHNICAL DATA

Resonance frequency (fs)

Total Q factor (Qts)

Effective cone area (Sd)

Voice coil former material

Linear excursion (Xmax)

Continuous power (Pe)

134.5±1.5 129±1.5 120.5±1.5

2x Port: D = 10 cm, L = 55 cm rounded on both sides Fb = 35 Hz, F3 = 29 Hz

12" SUBWOOFER • TECHNICAL DATA

Resonance frequency (fs)

Total Q factor (Qts)

Effective cone area (Sd)

Voice coil former material

Linear excursion (Xmax)

Continuous power (Pe)

157±1.5 152±1.5 141.5±1.5

2x Port: D = 10 cm, L = 30 cm rounded on both sides Fb = 30 Hz, F3 = 25 Hz

15" SUBWOOFER • TECHNICAL DATA Nominal diameter

Resonance frequency (fs)

Total Q factor (Qts)

Effective cone area (Sd)

Linear excursion (Xmax)

Continuous power (Pe)

Voice coil former material

100 liters, F3 = 37.4 Hz

2x Port: D = 15 cm, L = 48 cm rounded on both sides

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