Blaupunkt PC8, PC10, PC12, PC15 Technical Manua

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rofessional

Quality Subwoofers

Technical Manual For:

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TOPICS New Pro Component features System design guidelines Subwoofer enclosure types Subwoofer enclosure construction System installation guidelines Additional reference information

Limited warranty information

Technical support

PC 8

technical specifications and recommended box designs PC 10 technical specifications and recommended box designs PC 12 technical specifications and recommended box designs PC 15 technical specifications and recommended box designs

Technical support summary sheet (fax sheet)

PAGES

1 2

334 5,6

7 7 8

2526 27,28 29,30 31,32

SUJETS Caracteristiques des nouveaux composants Pro Principes de conception du

systeme

Types d’enceintes de subwoofer Construction d’enceintes de subwoofer Principes d’installation du systeme References Garantie

limitee

Soutien technique

PC 8:

specifications techniques et conception recommandee des enceintes

PC 10: specifications techniques et conception

PC 12: specifications techniques et conception PC 15:

specification$

techniques et conception

Demande de soutien technique (feuille de fax)

recommandee des enceintes recommandee des enceintes recommandee des enceintes

PAGES

11,12 13,14

2526

27,28

29,30 31,32

TEMAS Nuevas Caracterkticas Pro Component Principios de

disefio

del sistema

Tipos de

caja

del altavoz

para

bajas frecuencias

Construction de la

caja

del altavoz

para

bajas frecuencias

Principios de

instalacion

del sistema

Information de referencia adicional Information

de la garantfa

limitada

Apoyo

Tecnico

PC 8

especificaciones tecnicas y

diseflos

recomendados de la

,caja

PC 10 especificaciones tecnicas y

disefios

recomendados de la

caja

PC 12 especificaciones tecnicas y

disefios

recomendados de la

caja

PC 15 especificaciones tecnicas y

diseAos

recomendados de la

caja

Hoja de resumen de apoyo

tecnico

(hoja fax)

PAGINAS

17 18

19,20

21,22

23 23 24

25,26 21

2’,

31,32

Page 3

Components in order to introduce a series of subwoofer speakersaffering unparalleled value in the car audio market. The PC performance standards were increased yet we were able to drive the speaker costs down using improved manufacturing techniques and high technology

materials.

In addition to improved performance, the quality standards have been increased substantially. A car may see temperature extremes ranging from -40” to nearly 200” F driving from Minnesota to Arizona. Because of these extremes, our engineers subject their designs to long-term temperature, humidity, and vibration testing to ensure product life spans exceeding that of most

cars.

This manual is composed of several sections and offers brief discussions in each area.

New PRO COMPONENT FEATURES lists technical advancements of the pc woofers.

SYSTEM DESIGN GUIDELINES addresses system layout, sound

,quality,

and amplifiers.

SUBWOOFER ENCLOSURE TYPES discusses the trade-offs of popular box designs with

SUBWOOFER ENCLOSURE CONSTRUCTION reviewing basic box building techniques.

LLATION

GUIDELINES examines additional automotive installation concerns and

IONAL REFERENCE INFORMATION offers additional technical references for those

trying to

learn more about car audio. BLAUPUNKT WARRANTY INFORMATION for the applicable country is noted. BLAUPUNKT TECHNICAL SUPPORT 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 for all PC woofers is provided.

High performance car audio can be achieved with value conscious components. Simply

speaking, 95% of the car audio subwoofer installations made today really don’t need $400

woofers with 100 oz magnets! The PC series woofers were designed for HIGH POWER

HANDLING LEVELS, HIGH SOUND PRESSURE LEVELS, and FLEXIBLE INSTALLATION CHOICES.

HIGH POWER HANDLING was achieved

through a new ultra-linear long-throw

suspension with “bottomless” back plate design allowing for tremendous cone excursion without voice coil damage. The new rigid spider design (Blaupunkt trademarked as “SPIDERMAX”) renders spider tears a thing of the past. Double thickness compressed foam surrounds offer

linear cone movement without tearing from

over-excursion. New Strontium Ferrite

magnets yield smaller magnet sizes without reduced magnet strength but retain their magnetic power far beyond the expected life of the woofer. Four layers of wire on DuPont

danp

Polyamide voice coil bobbins with

1’

,rcoat”

allow for voice coil temperatures exceeding nearly 400” Fahrenheit without damage. New basket designs prevent the back of the cone from slapping the steel frame thus avoiding acoustical distortions and possible cone damage. Rear vented pole plates allow fresh air to move in from behind the woofer to cool the voice coil plus help prevent dust cap “popping” at the excursion limits.

-l-

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IMPROVED PERFORMANCE PARAMETERS for the new PC units were strategically balanced so that low resonant frequencies could be achieved along with high sound pressure levels. Cone mass is held to a minimum for high efficiency yet its Acrylic Resin Laminate (ARL) design yields tremendous rigidity. The lighter the cone the easier it is for the magnet to move it in and out; therefore, higher sound pressure levels for a given amount of amplifier power input.

Additional loudness is achieved through longer cone travel so we designed the PC units with

0.25 to 0.35 inches (6-8 mm) of peak-to-peak excursion which is rarely found in component

woofers of this price range.

INCREDIBLY FLEXIBLE INSTALLATION is the real benefit to the new Pro Components. The

PC woofers work well in sealed, vented, and bandpass boxes. Due to the low resonance values, they also work quite well in infinite baffle installations where the woofer is mounted on the rear deck of a car and uses the trunk for its enclosure.

The best investment in system design is planning time. Before building a house an architect

completely draws building plans. Although small modifications are often made throughout

construction, 99% of the home is built as planned. Exactly the same attitude must be

folio*

.’

in the design of a car audio system and we therefore refer to it as “System Architecture”.

MULTI-WAY SYSTEMS

Although a simple head-unit with four

speakers will provide reasonable sound, a

really good system almost always requires some kind of subwoofer. In order to include

the subwoofer speakers 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.

SOUND QUALITY VS. SPL

A well designed sound system can provide good sound quality and still play loud. Above about

120 dB (decibels) the sound isn’t perceived as getting much louder due to the non-linearities of the human ear. A speaker with reference value of 90 dB 1 watt/l meter will usually offer about

11 O-l 15 dB inside a car if driven by an amplifier of about 100 watts (more than enough for most

listeners).

Good sound quality is achieved when a system offers several sonic attributes. IMAGING is the accurate rendition of instrument placement which can only be achieved with proper loudspeaker placement. STAGING is an extension of imaging where a perceived listening event is recreated with well defined height, width, and depth as with an actual sound stage. Correct FREQUENCY

RESPONSE implies that all frequencies within the range of human hearing (20-20

kHz)

are audible and balanced in relation to one another. TIMBRE (pronounced Tam-burl) is the system’s ability to reproduce the sound signature of a trumpet so that it doesn’t sound lik trombone. LINEARITY is the systems ability to provide consistent frequency response

regardless of volume setting. Some systems sound “shrill” at high levels if the tweeters are over driven. They may also sound weak at low volumes due to our psychoacoustic hearing effects which we perceive

b&s

loss at low levels.

-2-

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SYSTEM PLANNING

The largest possible impact on any audio

system (home or car) is the quality of loudspeakers used and their placement. EFFICIENCY defines how loud a speaker will play for a given input power and is often quoted at 1 watt input and measured at a 1 meter distance. When designing a system you want to keep the component efficiencies as close as possible (This is usually

addressed

by individual manufacturers

it's

a safe bet to buy from one company.). Always match components for efficiency and complementing frequency response to

”

ensure smooth transition from low

FREQUENCY

rtkl

frequencies to higher ones for accurate performance. Remember that for every 3 dB of increased efficiency (SPL) a speaker has over another, the end performance is as if the amplifier has doubled it’s power output.

KER CONFIGURATIONS can become a problem in autosound installations. We would

achieve a sound field in front of us (like a live concert) as compared to sound partly from the front and partly behind us. This virtually dictates good midrange and tweeter speakers in front, usually mounted in the doors for good left/right balance, with high-pass crossovers set greater than 80-100 Hz. For deep bass a subwoofer is required but is nearly always located

behind us in a rear trunk or hatch area. If the subwoofer crossover is too

h in frequency

male voices can be heard “gurgling” out of the subwoofer speaker and there ore

sound-stage to the rear of the car, which is undesirable.

pulls the

AMPLIFIER POWER is important but should be of lesser importance compared to speaker

choice and placement. Matching the rms (continuous) power levels to that of the speaker is important but it should be -noted that under-powering 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 overheating,

regardless of manufacturer (Impedance = D.C. resistance of the voice coil wire + A.C.

resistance due to the coil of wire formed).

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 canceled thus substantially reducing the bass output of the speaker. This wall is absolutelv 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 a car to isolate the front and back waves of the speaker.

THIELE-SMALL PARAMETERS

Ev6woofer

has its own electromechanical characteristics which are called

THIELESMALL

eters.

tt:

The three most important parameters include RESONANT FREQUENCY

(“fs” -

dquency

where the speaker moves with the least mechanical resistance), TOTAL

the “magnification” of the cone movement at its resonant frequency), and VOLUMETRIC

(“Qts”

COMPLIANCE

(‘l/as” -

the equivalent volume of air that the woofer cone can displace for a

given power input). Using these parameters we can then calculate an optimum box volume for

a particular woofer and predict its associated frequency response.

-3-

Page 6

COMMON ENCLOSURE TYPES

In the car audio world there are 5 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), and 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

(~80

Hz for example).

INFINITE BAFFLE 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 capability and

substandard transient response.

SEALED boxes offer one of the best compromises in power

handling and performance. Because of the “air spring” provided by the box the advantaqes include simple box construction, high power handling, excellent transient response, and smooth low frequency roll-off. Disadvantaaes

include only moderate efficiencies 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. Advantaaes

include extended low frequency response, lower distortion due to smaller cone movements, good efficiency, good transient response: moderate size boxes, and high 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 are relatively new

(about 5 years in the car) but offer some advantages of both

the sealed and vented designs. Advantaaes include good

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 vent the sound from the

front and back of the woofer through individually tuned

enclosure on the front and rear of the woofer. The advantaqe 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 strong susceptibilities to’cone over-excursions (damage) for sound outside its primary frequency band.

-4-

Page 7

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

loss in efficiency but this is usually recovered with increased amplifier power. Care must be taken to avoid air leaks

een the two woofers and final speaker

and impedance loads must be

watched.

Before starting tinal 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 long wavelength low frequencies. You should avoid odd shapes that are difficult to cut and glue.

Particle board, MDF, or high grade birch plywood are good materials to build boxes with

thicknesses of

5/8”-314”

(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.

Acoustical damping material (fiberglass batting 2-4” thick) attached to 50% or more of the

interior walls helps reduce box noise considerably and also increases the box volume seen by the woofer by

lo-20%.

Spraying the inside walls with a damping material, such as tar

based automotive undercoating, also helps dampen wall resonances.

The final box should be rock solid and air tight but should also remain serviceable should a woofer be damaged for any reason.

S-way binding posts for electrical connection offer reliable connections and easy removal of the box for service or theft protection.

When possible, use

4”, 5”,

or 6” diameter port tubes to avoid wind noise from smaller

diameter sizes. PVC plumbing pipe in 2, 3, 4, 5, and 6” diameters is available at most

hardware stores with “elbow” pipes allowing you to bend the tubes inside the box.

‘\

ry to always use active (electronic) crossovers built into most power amplifiers.

,iegarding

simple vented boxes, you cannot achieve lower frequency response by simply lowering the port tuning frequency. This will severely overdamp the box frequency response therefore yielding less bass and lower power handling.

The distance between the woofer and its port should be less than 12” if possible.

Page 8

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

‘I”

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:

ilrl

-w-

!lYl&

c-w-

vol.uMEs

“1

+w--

c-w-

; _--_

cd-

. .

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

0354

Meters

39.37

Square inches

0.007

Inches Square feet

Square feet

144

Cubic inches

0 00058

Cubic feet

173R

Square inches Cubic feet Cubic inches

Liters

0.035

Cubic feet

-6-

Page 9

recommen

do your own installation please note the following important information.

Before cutting any

trjm

or steel make sure you clear all moving parts and factory electrical lines. Be sure to leave enough slack in the wire to prevent pulling or stretching wires for service later.

Tie down all loose wires to prevent them from getting caught in moving parts or shorted due to abrasion over time. Never mount speakers in a car’s wheel wells or areas where they might be subjected to moisture or road spray. Proper speaker polarity must be observed. The polarity positive side is marked by a (+) sign or a red dot. At low frequencies woofers out-of-phase will acoustically cancel having little bass output. Although the components used in Blaupunkt speakers exceed most international standard, speaker frames can be twisted by improper installation on uneven surfaces. This can occur when the surface is heavily padded or carpeted and the screws-are unevenly or

over-tightened.

if-

I/hen

installing more than one speaker per amplifier channel be sure that the combined

_\,;, ..npedance

values cannot damage the amplifier.

Speaker wire should be isolated from the electrical system of the car and routed away from any factory systems to avoid noise picked up and fed back to the amplifiers.

Speaker wire size should be of sufficient size to carry the full power of the amplifier (16 gauge or larger sizes are quite adequate for most systems).

interested in loudspeakers, acoustics, and electronics. Subjective comments are listed accordingly.

DESIGNING, BUILDING, AND TESTING YOUR OWN SPEAKER SYSTEM, David B.

Weems,

#1964,

Blue Ridge Summit, PA, 17294. (This is an introductory book on designing speakers for the home but is quite applicable to the car and is easy reading)

LOUDSPEAKER DESIGN COOKBOOK, Vance

Dickason,

Old Colony Sound Labs, Peterborough, NH, 03458. (This is a technical step up from

Weems

addressing complex woofer box and crossover designs but is excellent for reference.) SPEAKER BUILDER MAGAZINE, P.O. Box 494, Peterborough, NH, 03458. (This is a bimonthly hobbyist speaker magazine but offers tremendous technical information for the professional as well.) AUTOSOUND 2000 TECH BRIEFS, 2563 Eric Lane, Suite D, Burlington, NC, 27215.

(AZTB

is a bi-monthly magazine with very current technical information directly related to

the car stereo world. Although sometimes technical, it’s well written therefore easy to

understand.) “BLAUBOX” WOOFER BOX DESIGN COMPUTER PROGRAM, Blaupunkt division of the Robert Bosch Corporation, 2800 South 25th Avenue, Broadview, IL, 60153. (This is an IBM personal computer program used to predict the frequency response of a subwoofer in 10 different enclosures including sealed, vented, bandpass, and isobaric configurations.

wo woofers can be graphically compared in different boxes if desired. In addition, it will

,iint

out wood cutting “blueprints” to actually build the box with. Passive Crossover designs

’

are included. The program is sold through authorized Blaupunkt retailers and distributors.)

Page 10

distributes in the United States to be free from defects in material and workmanship in accordance with the following.

For twelve (12) months after delivery to you, the original consumer purchaser, we will repair

or replace at no cost to you. However, this warranty does not cover expenses incurred in the removal or reinstallation of any unit whether or not proven defective. To obtain performance of this warranty, contact the nearest Blaupunkt dealer. A dated

purchase receipt or other proof that the product is within the warranty period will be required

in order to honor your claim.

This warranty is limited to the original purchaser and is not transferable.

Specifically excluded from this warranty are failures caused by misuse, neglect, abuse,

improper operation or installation, or unauthorized repairs.

To the extent of the law, this warranty sets out your exclusive remedies with respect to

products covered by it, whether for negligence or otherwise. We will not be liable for

consequential or incidental damages, losses, or expenses. THIS WARRANTY IS IN LIEU

OF ALL OTHER EXPRESS WARRANTIES. ANY WARRANTY IMPLIED BY LAW,

WHETHER FOR MERCHANTABILITY OF FITNESS FOR A PARTICULAR PURPOSE OR

OTHERWISE, SHALL BE EFFECTIVE ONLY FOR THE PERIOD THAT THIS

EXPRE”

WARRANTY IS EFFECTIVE. No attempt to after, modify, or amend this limited warra

shall be effective unless authorized in writing by an

officer

of the Robert Bosch Corporation. Some states do not allow limitations on how long implied warranties last, or the exclusion or limitation of incidental or consequential damages, so the above limitations 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. 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, 2800 South 25th Avenue, Broadview, Illinois, 60153, attention

department

UAKSV.

Products sold outside of the United States fall under the warranty

limitations of that country and its Blaupunkt division requirements.

competently install these components. The Blaupunkt technical data provided should assist in

designing good subwoofer enclosures and answer most technical questions. Multiple computer programs currently exist for designing subwoofer enclosures but we

particularly recommend the “BLAUBOX” program offered by Blaupunkt through our retail outlets. This IBM PC computer program easily and quickly assists in comparing the acoustical frequency response of different woofers in different enclosures in hopes of preventing a poor

woofer/box combination. BLAUBOX also prints out wood cutting blueprints for tubular,

rectangular, and wedge shaped enclosures so errors are virtually eliminated by the user. We realize there may be some very unique installations being done so we prepared a “fax help”

page that can be faxed or mailed to us which we will in turn answer as promptly as possible. If

you have other technical questions or would like additional literature on other Blaupunkt

products please contact our offices at:

Blaupunkt division of the Robert Bosch Corporation 2800 South 25th Avenue Broadview, Illinois, 60153 USA 708 -

865-

5200

Thank you for buying Blaupunkt.....

BLAU NOW

Page 11

8” SUBWOOFER - TECHNICAL DATA l Nominal diameter

8.0 in (200mm)

Magnet weight

20 oz

(5689)

Nominal impedance

DC resistance (Re)

2.42

Resonance frequency (fs)

44 Hz

Total Q factor (Qts)

0.39

Mechanical

(Qms)

10.3

Electrical Q (Qes)

0.41

,,uivalent

air volume (Vas)

0.86

ft3

(24.3

Itr’s:

Air volume displacement

0.06

ft3

(1.7

Itr’s)

Effective cone area (Sd)

33.2

in2

(0.021

m2)

Compliance (Cms)

4.0 x

1O-4

M/N

Moving mass (Mms)

1 .o 02

(299)

Voice coil diameter

1.5” (38.1 mm)

Voice coil former material

Kapton polymide

Voice coil induct’ce (@400Hz) 1.20

Linear excursion (Xmax)

0.20 in

(5.lmm)

Force factor (BI)

6.9 Tm

Acoustical efficiency (No)

0.59 %

Continuous power (Pe)

120W (240 peak)

Sensitivity (SPL)

93 dB,

2.83v/lm

90 dB,

lW/lm

Woofer outline drawing

Anechoic wooter

response

The PC 8 woofer offers the best performance/box size compromise using a simple 0.75

1.00 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 over-excursion of the driver.

The Slngle-Vented Bandpass box offers a slightly lower -3dB frequency than the Vented

box but the efficiency will drop considerably. The Single-Vented Bandpass box should

erefore

be used for installations requiring very high power handling

(>lOO

watts) yet

quiring

the low cutoff frequencies offered by the Vented box.

l (Parameter values may deviate slightly in production

umts

but the perceived performance variations will be negligible.)

-25-

Page 12

SINGLE-VENTED

BANDPASS

BOX

!.oo I<NR>

SEALED BOX,

0.25 vs.

1.50cu.ft.

____________

VENTED BOX,

0.5

vs.

1.0 cu.Et.

all

BANDPASS BOX,

1.0 vs.

1.5

cu.it.

___________________________

I t

1.0

cu.ft.

-__ -

(,,,,,.

M”‘.‘“.~“.,,,.

‘O - - -

I’ - -

---1

3,; - - - - _ _ _ _ _ _

-I

1.5

cu.rt.

. .

.;...;

.\.

. .

Im mz ma

[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.

]

<NR> = NOT A RECOMMENDED APPLICATION

-26-

Page 13

10” SUBWOOFER - TECHNICAL DATA

Nominal diameter

10.0 in

(250mm:

Magnet weight

40 oz

(11409)

Nominal impedance

DC resistance (Re)

3.00

Resonance frequency (fs)

40 Hz

Total Q factor (Qts)

0.38

Mechanical Q (Qms)

9.27

Electrical Q (Qes)

0.40

::,.:,,oivalent

air volume (Vas)

1.90

ft3

(53.8

Itr’s

Air volume displacement

0.13

ft3

(3.7 Itr’s)

Effective cone area (Sd)

56.7

in2 (0.037m’

Compliance (Cms)

2.6 x

lo.4

M/N

Moving mass (Mms)

1.9 oz

(549)

Voice coil diameter

2.0”

(50.8mm)

Voice coil former material

Kapton polymide

Voice coil induct’ce

(@400Hz)

0.75

Linear excursion (Xmax)

0.20 in (5.1 mm)

Force factor (BI)

10.1 Tm

Acoustical efficiency (No)

0.82 %

Continuous power (Pe)

140W (280

peak:

Sensitivity (SPL)

dB,

2.83v/lm

dB, lW/lm

,-j-e

Woofer outline drawing

Anechoic

woofer response

The PC 10 woofer offers the best performance/box size compromise using a simple l.O-

1.5 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 levels

(cl00

watts rms) to prevent bottoming of the woofer cone.

moderate power

A 1.75 cubic foot Single-Vented

Bandpass

box offers a slightly lower -3dB frequency

compared to the Vented box. The

Bandpass

unit has considerably more power handling

pared

to the Vented box

(loo-150

watts) but this is traded off for slightly lower

crency

and increased construction complexity.

l (Parameter values may deviate slightly in production units but the perceived performance variations will be negligible.)

-27-

Page 14

‘SEALED

BOX

Total

I I

Freq Mld-

box

bsnd

0.75 82

191

1.00

182

191

‘1.50

182

191

~ 2.00

I84

Trunk

166

BOX

[BANDPASS

Box

SEALED BOX,

0.5

"B.

1.5 cu.ft.

. .

zoo

VENTED BOX,

0.5

VI!!.

1.5

cu.ft.

,:’

. . . , . . :

. .

2al

BANDPASS BOX

1.25 vs.

1.75

cu.ft.

-___---------_-----_-------

r--------

rhe

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.

]

<NR> = NOT A RECOMMENDED APPLICATION

-28-

Page 15

12” SUBWOOFER -TECHNICAL DATA l

Nominal diameter

12.0 in (300mm

Magnet weight

40 02

(11409)

Nominal impedance

451

DC resistance (Re)

2.10

Resonance frequency (fs)

34 Hz

Total Q factor

(Us)

0.40

Mechanical Q (Qms)

9.80

Electrical Q (Qes)

0.42

,clivalent

air volume (Vas)

3.40

ft3

(96.2

ltr’:

Air volume displacement

0.18

ft3

(5.1

Itr’s)

Effective cone area (Sd)

82.5

in2 (0.053m’

Compliance (Cms)

2.3 x

10s4

M/N

Moving mass (Mms)

3.1 oz

(889)

Voice coil diameter

2.0”

(50.8mm)

Voice coil former material

Kapton polymide

Voice coil induct’ce

(@400Hz)

1.50

Linear excursion (Xmax)

0.25 in (6.4 mm)

Force factor (BI)

9.7 Tm

Acoustical efficiency (No)

0.99 %

Continuous power (Pe)

160W (320 peak:

Sensitivity (SPL)

dB,

2.83v/lm

dB, lW/lm

--t-J

lofer outline drawing

Anechoic

woofer response

The PC 12 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 has enough area that it will begin to “pressurize” the car interior

therefore offering strong bass performance.

Infinite Baffle mounting (rear deck mounting)

works well for moderate power levels

(@lo0

watts) due to the pressurization principle

noted above.

l (Parameter values may deviate slightly in production units but the perceived performance variations will be negligible.)

1.75 cubic foot Single-Vented

Bandpass

box will offer overall performance about equal

:hat

of a Vented box along with greater power handling (100-200 watts). But, for many

” &ople,

the box construction will require above average carpentry skills.

-29-

Page 16

SEALED

BOX

1.00

168 192

1.50

168 192

Trunk

172

I92

VENTED

BOX

“7

f3 Ifi IPI. IPI. ISPL

Total

Freq. Port Port

POr(

IMid-

SINGLE-VENTED

BANDPASS

BOX

“,

f3, f3” f,

“F ‘R . ‘L

SPL

TOtill

Frsq. Frsq. Port Vented Sealed Port

Port

Mid-

bar

tune front rear

tube

tubs

band

vohmle

freq. box

boa

length length

effc’y

volume volume for 3”

for 4”

I. D.

port

POti

(cubic

(cubic (cubic

feel)

(HZ) (Hz) (HZ)

fes1)

feet)

(inches) (inches)

(da)

0.75

<NR>

1.00

I58 I160

195

1050 1050

I700

141

I.25 52 140

05 0 65

060 1.90 4.25

I.50 50 130

76 0 75 0 75

1 90 4 50

.75 42 120

70 0.75

3.00 625

1.50

24 105

50 0 75 2 75

151

SEALED BOX,

0.75 vs.

2.0 cu.ft.

__-

VENTED BOX,

0.75 "8.

2.0 cu.ft.

BANDPASS BOX,

3.5

CU.ftz.

---__---------___---_______

_,L_-____--

_i_________

3.5

cu.ft.

rhe

data above is offered as a “starting point” for comparison purposes because these designs are only a few of many

possible box configurations. Be

sura

to account for the air volume displacement of the woofers and the port tubes.

]

<NR> = NOT A RECOMMENDED APPLICATION

-3o-

Page 17

15” SUBWOOFER -TECHNICAL DATA l

Nominal diameter

15.0 in

(380mm:

Magnet weight

40 oz

(11409)

Nominal impedance

DC resistance (Re)

2.08

$I2

Resonance frequency (fs)

24 Hz

Total Q factor

(Us)

0.38

Mechanical Q

(Qms)

7.10

Electrical Q (Qes)

0.41

,,Jivalent

air volume (Vas)

12.1

ft3

(342

Itr’s:

Air volume displacement

0.35

ft3

(9.9 Itr’s)

Effective cone area

(Sd)

132

in2

(0.086m2

Compliance

(Cms)

3.1 x

1O-4

M/N

Moving mass (Mms)

4.8 oz

(1359)

Voice coil diameter

2.0”

(50.8mm)

Voice

coil former material

Kapton polymide

Voice coil induct’ce

(@400Hz)

1.50

Linear excursion (Xmax)

0.25 in (6.4 mm)

Force factor (BI)

10.2 Tm

Acoustical efficiency (No)

1.13 %

Continuous power

(Pe)

180W (360 peak:

Sensitivity (SPL)

dB,

2.83v/lm

dB, lW/lm

6.70” .

ttm nmJ

Woofer outline drawing

FREBKNCY oiz)

Anechoic

woofer response

The PC 15 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 results simply due to the pressurization of the car’s interior from so much woofer cone area and movement.

A Single-Vented

bandpass

box approaching 6.0 cubic feet must be constructed to provide

e -3dB frequency similar to a Vented design. The advantage with the

bandpass

design

‘its tremendous power handling potential (200 watts +

(Parameter values may deviate slightly in production units but the perceived performance variations will be negligible

-31-

Page 18

SINGLE-VENTED

BANDPASS

BOX

SEALED BOX,

1.5

vs.

3.0

CU.ftz.

110

,me

---

-------------__--___-____

. .

. . . . .

loo iv.

VENTED BOX,

1.5

V6.

3.0 Cu.ft.

,m_ _-____-__-------------

-----

BANDPASS BOX,

3.5 vs.

6.0 cu.ft.

rhe

data above is offered as a “starting point” for comparison purposes because these designs are only a few of many

possible box

configuralions.

Be sure.to account for the air volume displacement of the woofers and the port tubes.

]

<NR> = NOT A RECOMMENDED APPLICATION

-32-

Page 19

out this sheet and return by fax

or mail. ‘(At this time we can

only provide answers in English.)

FAX

OR MAIL TO; BLAUPUNKT TECHNICAL SUPPORT 2600 SOUTH 25TH AVENUE BROADVIEW, IL 60153 (FAX)

708-450-6554

(VOICE)

708-665-5200

NUMBER OF PAGES TOTAL:

FROM:

NAME: COMPANY: STREET: CITY: STATE 8 ZIP CODE: COUNTRY:

’

DAYTIME PHONE:

DAYTIME FAX: TODAY’S DATE:

What enclosure type do you have or want?

[ ]

sealed[ ] vented

[ ]

other (define)

[ ]

bandpass [ ] isobaric

What Blaupunkt woofer model numbers are you working with?

ow many woofers are in the same cabinet?

?ow

many port tubes do you have or want?

I’

Diameter and length of each? Do you want round (PVC pipe) port tubes or square? [ ] round What is the total cubic volume of the enclosure you have or want?

[

] square

(Maximum h x w x d)

How much amplifier power are you applying to each woofer?

[ ]

cubic feet [ ] liters

’

Is there any other information we should know about your system?

Please draw box designs or add additonal information we might need for your system below:

-33-

Page 20

0 BLAUPUNKT

Bosch Telecom

Robert

Bosch Corporation Sales Group - Blaupunkt Division 2800 South 25th Avenue, Broadview, Illinois 60153

Division Blaupunkt de Robert Bosch Inc. Mississauga, Ontario Canada

Printed in the U.S.A.

L5N IRl

PI-105

4/93