VXS 12 - Subwoofer BLAUPUNKT - Free user manual and instructions

USER MANUAL VXS 12 BLAUPUNKT

the reference of sound

VXS 12

Thanks for choosing Velocity!

Congratulations on your purchase of your new Velocity product! We have invested tremendous effort in the de-sign process of the new Velocity subwoofer Referencseries, in order to achieve superior musical performance.

For maximum performance and reliability we highly recommend that your new Velocity subwoofer be installed by an authorised Velocity dealer. By using our Velocity line component speakers and amplifiers you can be as-sured of making the best out of your high-quality audio hi-fi system without spoiling the sound by using com-ponents of inferior quality.

For additional information on the Velocity Product Line (technical data, user notes and soon also a simulation programme for subwoofer housings) visit our Internet site at: http://www.velocity.de.

Safety precautions

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 for-ward.

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.

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.

SEATED 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.

ISOBARIC CONFIGURATION (TANDEM)

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 10cm 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.

TYPEN SUBWOOFER-BOXEN

ATT BYGGA LAGBASLADA

TYPEP AFBUBWOOFER-BOKSE

SUBWOOFER-KABINETTERS OPBYGNING

10" SUBWOOFER • TECHNICAL DATA
Nominal diameter	10.0 in (250 mm)
Nominal impedance	4/4 Ω (ea. coil)
DC resistance (Re)	3.4 Ω (ea.)
Resonance frequency (fs)	37 Hz
Frequency Response	35-2.500 Hz
Total Q factor (Qts)	0.58
Mechanical Q (Qms)	7.88
Electrical Q (Qes)	0.7
Equivalent air volume (Vas)	25.2 ltr's
Effective cone area (Sd)	57 in² (0.035 m²)
Voice coil diameter	50 mm
Voice coil former material	Spun Al. Cone (SAC)
Linear excursion (Xmax)	±12 mm
Continuous power (Pe)	200 W (600 peak)
Sensitivity (SPL)	92 dB

VXS 10

Recommended box designs • Boxenempfehlung • Conception recommandée des enceintes • Box raccomandati • Aanbevolen boxer • Rekommendationer • Recomendaciones de cajas de altavoz • Caixas recomendadas • Anbefaling af bokse

Sealed:	20 – 60 liters
Vented:	30 liters Port: D = 9.8 cm, L = 25.4 cm rounded on both sides
Bandpass:	Rear Box = 8 liters Front Box = 22 liters Port: D = 16 cm, L = 26 cm rounded on both sides

VXS 12

Specifications • Technische Daten • Caracteristiques techniques • Specifiche • Specificaties • Specifikationer • Especificaciones • Especificações • Specifikationer

12" SUBWOOFER • TECHNICAL DATA
Nominal diameter	12.0 in (300 mm)
Nominal impedance	4/4 Ω (ea. coil)
DC resistance (Re)	3.8 Ω (ea.)
Resonance frequency (fs)	35 Hz
Frequency Response	31-2.000 Hz
Total Q factor (Qts)	0.66
Mechanical Q (Qms)	11.34
Electrical Q (Qes)	0.7
Equivalent air volume (Vas)	49 ltr's
Effective cone area (Sd)	82 in² (0.051 m²)
Voice coil diameter	65.5 mm
Voice coil former material	Spun Al. Cone (SAC)
Linear excursion (Xmax)	±12 mm
Continuous power (Pe)	500 W (1.500 peak)
Sensitivity (SPL)	93 dB

VXS 12

Recommended box designs • Boxenempfehlung • Conception recommandée des enceintes • Box raccomandati • Aanbevolen boxer • Rekommendationer • Recomendaciones de cajas de altavoz • Caivas recomendadas • Anbefaling af bokse

Sealed:	40 – 80 liters
Vented:	40 liters Port: D = 9.8 cm, L = 17.2 cm rounded on both sides or Port: D = 11.8 cm, L = 26.7 cm cylinder or rounded on both sides
Bandpass:	Rear Box = 14 liters Front Box = 26 liters Port: D = 16 cm, L = 20.2 cm rounded on both sides

VXS 15

Specifications • Technische Daten • Caracteristiques techniques • Specifiche • Specificaties • Specifikationer • Especificaciones • Especificações • Specifikationer

15" SUBWOOFER • TECHNICAL DATA
Nominal diameter	15.0 in (380 mm)
Nominal impedance	4/4 Ω (ea. coil)
DC resistance (Re)	3.8 Ω (ea.)
Resonance frequency (fs)	35 Hz
Frequency Response	24-1.500 Hz
Total Q factor (Qts)	0.82
Mechanical Q (Qms)	9.57
Electrical Q (Qes)	0.85
Equivalent air volume (Vas)	106 ltr's
Effective cone area (Sd)	116 in² (0.072 m²)
Voice coil diameter	65.5 mm
Voice coil former material	Spun Al. Cone (SAC)
Linear excursion (Xmax)	±12 mm
Continuous power (Pe)	600 W (1.800 peak)
Sensitivity (SPL)	93 dB

VXS 15

Recommended box designs • Boxenempfehlung • Conception recommandée des enceintes • Box raccomandati • Aanbevolen boxer • Rekommendationer • Recomendaciones de cajas de altavoz • Caivas recomendadas • Anbefaling af bokse

Sealed:	no recommendation
Vented:	60 liters Port: D = 11.8 cm, L = 29 cm rounded on both sides
Bandpass:	no recommendation

Service numbers / Service-Nummern / Numeros du service après-vente / Numeri del servizio di assistenza / Servicenummers / Telefonnummer für service / Númoses deServiço / Número deServiço / Servicenumre

Country:		Phone:	Fax:	WWW:
Germany	(D)	0180-5000225	05121-49 4002	http://www.blaupunkt.com
Austria	(A)	01-610 390	01-610 393 91
Belgium	(B)	02-525 5454	02-525 5263
Denmark	(DK)	44 898 360	44-898 644
Finland	(FIN)	09-435 991	09-435 99236
France	(F)	01-4010 7007	01-4010 7320
Great Britain	(GB)	01-89583 8880	01-89583 8394
Greece	(GR)	0030 210 57 85 350	0030 210 57 69 473
Ireland	(IRL)	01-4149400	01-4598830
Italy	(I)	02-369 6331	02-369 6464
Luxembourg	(L)	40 4078	40 2085
Netherland	(NL)	023-565 6348	023-565 6331
Norway	(N)	66-817 000	66-817 157
Portugal	(P)	01-2185 00144	01-2185 11111
Spain	(E)	902-120234	916-467952
Sweden	(S)	08-7501500	08-7501810
Switzerland	(CH)	01-8471644	01-8471650
Czech. Rep.	(CZ)	02-6130 0441	02-6130 0514
Hungary	(H)	01-333 9575	01-324 8756
Poland	(PL)	0800-118922	022-8771260
Turkey	(TR)	0212-3350677	0212-3460040
USA	(USA)	800-2662528	708-6817188
Brasil (Mercosur)	(BR)	[phone]	[phone]
Malaysia (Asia Pacific)	(MAL)	[phone]	[phone]