Blaupunkt VPC 10D Manual Download Page 9

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During box construction, temporarily assemble the box to make sure all pieces line up

properly. Then assemble all pieces before cutting out the holes for the woofers. Once the
box is fully assembled, connect an oscillator/amplifier to the woofer, sweep it through 20-

100 Hz, and listen for strange air whistling noises, buzzes, and rattles. Since the box will

eventually be mounted in a car it should be firmly fastened down. Simple

shaped

brackets

work

well.

BASIC MATH CALCULATIONS

To build a subwoofer box some very basic math calculations must be made accurately
referencing the formulas and drawings below:

VOLUME AND AREA CALCULATIONS

AREA:

VOLUME:

Circle (port opening)

A = 0.79 x d x d

N/A

Rectangle

N/A

Triangle

Cylinder (Port tube)

N/A

U = 0.79 x d x d x h

Rectangular box

N/A

V =

AREAS

Speaker parameters and box calculations often need some kind of math conversions in

order to make the numbers easy to work with. Some common conversions are listed

below:

VOLUME AND AREA CONVERSIONS

TO CONVERT FROM:

MULTIPLY BY:

TO GET:

Inches

0.0254

Meters

39.37

Inches

uare inches

0.007

Square feet

feet

144

Square inches

Cubic inches

0.00058

Cubic feet

1728

Cubic inches

Liters

0.035

Cubic feet

Summary of Contents for VPC 10D

Page 1: ...nal Biuatity Dual Subwuufers Pm Composant de professionnelle bobine 6 8 deux voix Sistemas de altavoz de calidad ssionaf con componente e voz dual SubwcmWrs4e qualidade issional corn bobina para M k the U S A _ ...

Page 2: ...specifications techniques et conception recommandee des enceintes 28 29 VPCl OD specifications techniques et conception recommandee des enceintes 30 31 VPCl2D specifications techniques et conception recommandee des enceintes 32 33 VPCl5D specifications techniques et conception recommandee des enceintes 34 35 Blaupunkt demande de soutien technique feuille de fax 36 Autres notes 37 TEMAS Nuevas Cara...

Page 3: ...T provides telephone and fax support numbers and addresses with the BLAUPUNKT TECHNICAL SUPPORT SUMMARY SHEET formalizes your tech requests so they can be mailed in and or faxed in to our technical support people Finally in depth TECHNICAL DATA fo all PC woofers is provided speaking 95 of the car audio subwoofer installations made today really don t need 400 woofers with 100 oz magnets The VPC ser...

Page 4: ... a dividing network must be installed that keeps the low frequencies out of the midrange speakers Two way crossovers have a crossover point set of 80 to 100 Hz for example You can go crazy with additional crossover points and amplifiers three way five way etc but these should be left to the better retail installers or high end hobbyists HMbuNrr ELEclRoNlc CROSSOVER SCHANNEL AMPlJflER SUBwooFER SOU...

Page 5: ...a system can often cause more damage than slightly overpowering it If the speakers are rated for 50 watts rms you can often drive them with a 100 watt power amp without concern IMPEDANCE is the electrical resistance to AC current flow and is typically 4 ohms for most car speakers Impedance loads for a speaker configuration shouldn t fall below 2 4 ohms for most installations to avoid amplifier ove...

Page 6: ...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 THIELE SMALL PARAMETERS Every woofer has its own electromechanical characteristics which are called THIELE SMALL parameters The three most important parameters include RESONANT FREQUENCY the frequency where the speaker moves with the least mechanical res...

Page 7: ...ficiencies at low frequencies and the need for large box volumes VENTED boxes extend the low frequency response below that of the sealed box by using a port tube Advantaqes include extended low frequency response lower distortion due to smaller cone movements in its passband good efficiency good transient response moderate size boxes and high power capacity Disadvantages include increased complexi...

Page 8: ...are good materials to build boxes with thicknesses of 5 8 3 4 12 16 mm Solid wood panels should actually be avoided because of vibration potential and wood warping over time 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 Acous...

Page 9: ...ust be made accurately referencing the formulas and drawings below VOLUME AND AREA CALCULATIONS AREA VOLUME Circle port opening A 0 79 x d x d N A Rectangle A hxw N A Triangle A 0 5xhxw N A Cylinder Port tube N A U 0 79 x d x d x h Rectangular box N A V hxwxd N A V 0 5xhxwxd AREAS 0 d II w VOWNES t h I 8 c w cl Speaker parameters and box calculations often need some kind of math conversions in ord...

Page 10: ...ystems The following is a list of materials and sources of recommended reading for the person interested in loudspeakers acoustics and electronics Subjective comments are listed accordingly DESIGNING BUILDING AND TESTING YOUR OWN SPEAKER SYSTEM David B Weems Copyright 1984 TAB books 1964 Blue Ridge Summit PA 17294 This is an introductory book on designing speakers for the home but is quite applica...

Page 11: ...tations or exclusions may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state n This warranty is void for damage occurring during shipment and for products with defaced serial numbers or date code markings For further information regarding this warranty please contact the Blaupunkt division of the Robert Bosch Corporation...

Page 12: ...Sensitivity SPLI 92 dB 2 83v lm 89 dB lW lm 8 210 I b 5 80 14 3 mm 7 00 17s mm Woofer outline drawing mechoic woofer response The VPC8D woofer offers the best performance box size compromise usin 0 75 l OO cubic foot Vented box The Sealed box drives the 3dB frequency very high 80 Hz An Infinite Baffle mounting rear package shelf is recommended only for low power systems 75 watts due to possible ov...

Page 13: ... 2On VENTED BOX 0 5 vs 1 0 cu ft 10 L 3 mu______________________ 10 50 100 IQ am BANDPASS BOX 1 0 vs 1 5 cu ft IL 1 5 cu Pt 0 Y I IO SO lrn nz am am The data above is offered as a starting point for comparison purposes because these designs are only a few of many possible box configurations Be sure to account for the air volume displacement of the woofers and the port tubes 1 NR NOT A RECOMMENDED ...

Page 14: ...m I Anechoic woofer response 91 dB lW lm The VPClOD woofer offers the best performance box size compromise using a simple 1 0 l 5 cubic foot Vented box The Sealed box pushes the 3dB frequency high 80 Hz but this unit will work well in an Infinite Baffle mounting car trunk if using moderate power levels 100 watts rms to prevent bottoming of the woofer cone A 1 75 cubic foot Single Vented Bandpass b...

Page 15: ...t 10 50 am BANDPASS BOX 1 25 V S 1 75 cu it 10 so Im nz zm sm TThe data above is offered as a starting point for comparison purposes because these designs are only a few of many possiblf box configurations Be sure to account for the air volume displacement of the woofers and the port tubes 1 NR NOT A RECOMMENDED APPLICATION 31 ...

Page 16: ... dB lW lm 0 Q 12 20 310 mm c 0 Q 0 0 5 60 143 mm Woofer outline drawing l Parameter values may deviate slightly h production units but the perceived petfonnance variations win be negligible Anechoic woofer response The VPC12D woofer provides the best performance box size compromise using a 1 5 2 0 cubic foot Vented box The Sealed box designs drive the 3dB frequency high 70 Hz but the woofer cone h...

Page 17: ..._ _ _ _ _ _ __ _ _ 0 1 75 Cu ft I n d v 6 I 0 ml_ _ __ __ a I _ s _ _ _ _ _ _ N I 3 5 cu ft a 0 10 50 im z zoo sm I IThe data above is offered as a starting point for comparison purposes because these designs are only a few of many possibk box configurations f3e sure to account for the air volume displacement of the woofers and the port tubes NR NOT A RECOMMENDED AP WCATlON 33 ...

Page 18: ... 440 peak Sensitivity SPL 96 dB 2 83v lm 93 dB lW lm 15 20 386 mm o w 13 mm 90 175 mm _ _ Woofer outline drawing Anechoic woofer response The VPCl5D woofer offers the best performance box size compromise using a 3 0 cubic foot Vented box The Sealed box pushes the 3dB frequency above 50 Hz but an Infinite Baffle trunk installation using the rear deck or back of the rear seats can offer tremendous r...

Page 19: ...P 2m sm VENTED BOX 1 5 vs 3 0 Cu ft 110 Im __________ __ _____ _ __ 70 10 M Irn n2 2m sm 110 BANDPASS BOX 3 5 vs 6 0 cu ft 1 0 5 0 im n2 200 sm h data above is offered as a starting point for comparison purposes because these designs are only a few of many possible box connations Be sure to account for the air volume displacement of the woofers and the port tubes 1 NR NOT A RECOMMENDED A PLlCATlON...

Page 20: ... do you have or want I sealed 1 1 vented 1 bandpass I isobaric other define 2 What Blaupunkt woofer model numbers are you working with 3 How many woofers are in the same cabinet 4 How many port tubes do you have or want Diameter and length of each 5 Do you want round PVC pipe port tubes or square I round 6 I square What is the total cubic volume of the enclosure you have or want Maximum h x w x d ...

Page 21: ... 37 ...

Page 22: ...sion Blaupunkt de Robert Bosch Inc Mississauga Ontario Canada L5N IRI Ve ocity is a Trademark of the Rocktron Corporation Rochester Hills Ml Copyright 1993 by the Robert Bosch Corporation No portion of this work may be reproduced in any form without the written consent of the Robert Bosch Corporation Printed in the U S A PI 121 3194 ...

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