Professional Quality Component Subwoofers
Subwoofers ti composant de
qualitci!
professionneile
-woofers-cotxomponente-de-catidad
profesiona----
Subwoofers corn componente de qualidade profissional
Made in the U.S.A
Bosch Group
TOPICS
New Pro Component features
System design guidelines
Acitve & Passive electrical configurations
Subwoofer enclosure types
Subwoofer enclosure construction
Installation guidelines
Additional reference information
Limited warranty information
Technical support
PC85 technical specifications and recommended box designs
PC1 05 technical specifications and recommended box designs
PC1 25 technical specifications and recommended box designs
PC1 55 technical specifications and recommended box designs
Blaupunkt technical support summary sheet (fax sheet)
Other notes
PAGES
1
2
3,4
4,5
6,7
8
8
9
9
28,29
30,31
32,33
34,35
36
37
Principes de conception du
systeme
Configurations
Blectriques actives
et passives
Types d’enceintes de subwoofer
Construction d’enceintes de subwoofer
Principes d’installation du
systeme
References
Garantie
limitee
Soutien technique
PC85 specifications techniques et conception recommandee des enceintes
PC1 05 specifications techniques et conception recommandee des enceintes
PC1 25 specifications techniques et conception recommandee des enceintes
PC1 55 specifications techniques et conception recommandee des enceintes
Blaupunkt demande de soutien technique
(feuille
de fax)
SUJETS
Caracteristiques des nouveaux composants Pro
PAGE
10
11
12,13
13,14
15,16
17
17
18
18
28,29
30,31
32‘33
34,35
36
Autres notes
37
TEMAS
Nuevas Caracteristicas Pro Component
Principios de
diseiio
del sistema
Configurations electricas activas y pasivas
Tipos de
caja
del altavoz
para
bajas frecuencias
Construccidn de la
caja
del altavoz
para
bajas frecuencias
Principios de
instalaci6n
del sistema
Information de referencia adicional
lnformacidn de la garantia
limitada
Apoyo
Tdcnico
PC85 especificaciones tecnicas y
disefios
recomendados de
la.caja
PC105 especificaciones
tecnicas y diserios
recomendados de la
caja
PC1 25 especificaciones
tecnicas y disetios
recomendados de la
caja
PC1
55 especificaciones
tecnicas y
diseiios recomendados de la
caja
Blaupunkt hoja de resumen de apoyo
t6cnico (hoja
fax)
Otras
notas
.
PAGINAS
19
20
21,22
22,23
24.25
26
26
27
27
28,29
30,31
32.33
34,35
36
37
_i_
subwoofersinorder to
introduce the second generation of PC subwoofers offering
unparalleled value in the car audio market. Why mess up a good design? Well, the PC
performance standards, rugged design, and flexible installation were maintained but now
offer aggressive new cosmetics and an improved owner’s manual.
Throughout the life of the PC woofers we have continued to improve the reliability to
industry leading standards in quality. We have followed product improvements with
owner’s manual refinements to help the end user in the box decision process. A COMMON
BOX DESIGN CHART offering suggested box designs for SMALLEST, MOST ACCURATE,
and POUNDER designs is given for each woofer.
This manual is composed of several sections and offers brief discussions in each area.
New PRO COMPONENT FEATURES lists technical advancements of the VPC 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.
INSTALLATION GUIDELINES examines additional automotive installation concerns and
ADDITIONAL 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 VPC 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
-
DUSTCAP
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 Kapton Polyamide voice coil
bobbins with “Armorcoat” 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-
SUPERIOR 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 perform 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
followed 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.
SUBWOOFER
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 loudspeaker 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-bur’)
is the system’s ability to reproduce the sound signature of a trumpet
so that it doesn’t sound like a trombone. LINEARITY is the systems ability to provide
consistent frequency response regardless of volume setting. Some systems sound “shrill”
at high levels if the
tweetersgre
over driven. They may also sound weak at low volumes
due to our psychoacoustic hearing effects which we perceive bass loss at low levels.
-2-
SYSTEM PLANNING
: i I!:::,
: : I!
If,
::_
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. Always
match components for efficiency and
complementing frequency response to
ensure smooth transition from
IOW
frequencies to higher ones for accurate
performance. Remember that for every 3
FREQUENCY
[Hz1
dB
of increased efficiency
(SPL)
a speaker has over another, the end performance is as if
the amplifier has doubled it’s power output.
.-
1
I
SPEAKER CONFIGURATIONS can become a problem in autosound installations. We would
like to 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
high in frequency male voices can be heard “gurgling” out of the subwoofer speaker and
therefore pulls the sound-stage to the rear of the car, which is undesirable.
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).
At some point, the subwoofer speaker must be electrically connected to an
audro
amplifier,
be it a stand-alone unit of some kind or the amplifier built inside the radio. The highest level
of performance will be from the outboard unit in most cases due to its power. To avoid
disapppointing performance we recommend power amplifier levels above 40-50 watts. This
is
NOT
a minimum value; it is simply a nice power point where you begin to really u the
substantial improvements in sound offered by a good subwoofer.
In addition to the amplifier, there needs to be an electrical “crossover” which limits the
frequencies sent on to the subwoofer speaker to only bass type signals. There are two
types of electrical crossovers; ACTIVE and PASSIVE. The Active crossover requires an
interface box (the Active crossover) and connects between the radio and amplifier thus
limiting the frequency range of signal (e.g., below 100 Hz) before it’s sent on to the
amplifier.
The Passive crossover allows the amplifer to reproduce all frequencies (20-20
kHz) and then “brute-force” limits the signal to the low frequencies (e.g., below 100 Hz)
before being passed on to the woofer. The Active crossover offers the highest performance
but is more expensive and has increased installation complexity compared to the Passive
design.
-3-
ACTIVE CROSSOVER SYSTEM
OUTPUT
/
,’
RADIO
/
T-I
AMP
‘~=lx~
‘Xx
a
ACTIVE CROSSOVE
FREQUENCY
1
PASSIVE CROSSOVER SYSTEM
6
dBlOctave
PASSIVE CROSSOVER
<
Inductor Value
W-U
I
80
8.0
100
6.4
150
4.2
200
3.2
I
I
12
dBlOctave
100
150
200
9.0
6.0
4.5
280
iao
140
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
t\iiro
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 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.
THIELE-SMALL PARAMETERS
Every woofer has its own electromechanical characteristics which are called THIELE-SMALL
parameters. The three most important parameters include RESONANT FREQUENCY
(“fs” -
the frequency where the speaker moves with the least
mecha’nical
resistance), TOTAL
0
(“Qts” -
the
”
magnification” of the cone movement at its resonant frequency), and
VOLUMETRIC
COMPLIANCE Was” - 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 reasonably predict its frequency response.
.
-4
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 (e.g.,
>80
Hz).
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. Advantaaes include simple
0
:
(7
installation and adequate performance for most systems.
Disadvantaaes include poor power handling capability and
substandard transient response.
9
._
:
SEALED boxes offer one of the best compromises in
power handling and performance. Because of the “air
spring” provided by the box the advantaaes 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 in its passband, good
efficiency, good transient response, moderate size boxes,
and high power capacity. Disadvantaaes 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.
L
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
reasonable efficiency, small box volumes, good transient
response, extended low frequency performance, and can
be used with very high power amplifiers. Disadvantaaes
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
advantaae of this design is its high efficiency over a
narrow frequency band. Disadvantaaes 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.
%
-5-
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.
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.
C.?dd
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 with
thicknesses of
5/8”-3/4” (I
2-16 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 and also increases the box volume seen by the
woofer by IO-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.
5-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.
Try to always use active (electronic) crossovers built into most power amplifiers.
Regarding 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.
-6-
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
w’oofer,
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
“L”
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
A = hxw
N/A
Triangle
A=0.5xhxw
N/A
Cylinder (Port tube)
N/A
V‘= 0.79xdxdxh
Rectangular box
N/A V=hxwxd
Triangular box
N/A
V=0.5xhxwxd
Cone
N/A
V = 0.26 x d x d x h
AREAS
.
0
d
irll
c-w-
VOLUMES
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
lelow:
VOLUME AND AREA CONVERSIONS
TO CONVERT FROM:
MULTIPLY BY: TO GET:
Inches
IO.0254
Meters
I 39 37
Square inches 0.007
Square feet 144
Cubic inches 0.00058
Cubic feet 1728
Liters
0.035
Meters
Inches
Square feet
Square inches
Cubic feet
Cubic inches
Cubic feet
-7-
We recommend that you have your Blaupunkt woofers professionally installed. If you
choose to do your own installation please note the following important information.
Before cutting any trim 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.
When installing more than one speaker per amplifier channel be sure that the combined
impedance 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).
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
accordinnlv.
DESIGNING, BUILDING, AND TESTING YOUR OWN SPEAKER SYSTEM, David B.
Weems,
Copyright 1984, TAB books #I 964, 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, copyright 1991, distributed by
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 bi-
monthly 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.
(A2TB
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. Two woofers can be graphically compared in different boxes if desired.
In addition, it will print 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.)
.
-8-
The Robert Bosch Corporation warrants new Blaupunkt
loudsp&akers
and accessories it
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 EXPRESS
WARRANTY IS EFFECTIVE. No attempt to alter, modify, or amend this limited warranty
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 p;oducts 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
UA/CSV.
Products sold outside of the United States fall under the warranty
limitations of that country and its Blaupunkt division requirements.
We will make all reasonable efforts to help you, the end purchaser or Installation
Technician, to 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!
-9-
Nominal drameter
Magnet weight
Nominal impedance
DC resistance (Re)
Resonance frequency (fs)
Total Q factor (Qts)
Mechanical Q (Qms)
Electrical Q (Qes)
Equivalent air volume (Vas)
Air volume displacement
Effective cone area (Sd)
Compliance (Cms)
Moving mass (Mms)
Voice coil diameter
Voice coil former material
Voice coil induct’ce
(@400Hz)
Linear excursion (Xmax)
Force factor (BI)
Acoustical efficiency (No)
Continuous power
(Per
Sensitivity (SPL)
8.0 in (200mm)
20 oz
(5689)
4Q
2.42
Q
44 Hz
0.39
10.3
0.41
0.86
ft’
(24.3 Itr’s)
0.06
ft’
(1.7 Itr’s)
33.2
in2(0.021m2)
4.0 x
lo-’ M/N
1 .o oz
(299)
1.5” (381mm)
Kapton polymide
1.20
mH
0.20 in
(5lmm)
6.9 Tm
0.59 %
12OW
(240 peak)
93
dB, 2.83v11m
90
dB, lW/lm
T+=
0.30"
(0 mm)
4.w
(102 mm)
I
Woofer outline drawing
FREQUENCY
t-Hz)
Anechoic woofer response
If you’re really tight on space, stick with an 8” in this small box
Good transient response and power handling
“‘.’
c
0.5
Below this box volume will put a big bump in the frequency response
tie
0.75
Surprising accuracy with good frequency response from a small system
.___
r
0.75
Don’t over-size the box or power handlina will
suffer
s~t~~si~~~~~~~~~~~~~~~~~~~~~~
0.75
CAUTION! Accurate calculations must be used in construction
.:.:.~..:.:.:.:.:.j:.:.~~:.~.:.~::::::::::::::::::::::.:::::::::::
~~~~~~~~~~~~~
..___.
__-.
___-__
1.0
. :
.: .:.:.. ::: ::::::::::::::::::.::::.:.:.:.:.:.:.:.:.:.:.:.:.:.:.:,
Efficiency & bandwidth are nicely balanced
~~~~~-
~~..__.~~
:.:
:.:.:.:.:.:.:.:.:.:.:.~:.:.:~~.:.:.:.:.:.:.:.:.~;.:.:.:.~:.:.:.:.:.:.:.~.
1.25
..,.,
The efficiency drops some but you can really hit this one hard
l (Parameter values may deviate slightIt in production units but the perceived performance variations will be negligible.)
-28-
1
~EysBOX,
.
1.50cu.rt.
,., .
II
,fJfJ ___________________________
90
1.50cu.rt.
-----_______
sm
VENTED BOX.
0.5
vs.
1.0
cu.rt.
110
,m. ____-_____-____~____________
m
,,
.
.
. .
20
50
lm
HZ
zm
5m
BANDPASS BOX,
1.0
vs.
1.5
cu.rt.
110
Im. _____________________-______
m ,,
90
1.0
cu.rt.
20
50
IDo HZ
2m sm
[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
-29-
95
dB, 2.83v/lm
Voofer
outline drawing
Anechoic woofer response
Although limited in cutoff frequency, most listerners should be satisfied
-__
Somewhat “one-note” performance due to narrow bandwidth
response
__~ .~_._.___.
Smooth frequency response & good transinents but lower efficiency
l (Parameter values may deviate
slightliin
production units but the perceived performance variations will be negligible.)
-3o-
Total
I I
Freq Mid-
box
band
rnmk 166
191
‘T If3 fB p, p,
SPL
Total
Freq.
Port Port
POli
Mid-
box
tune tube
tube
band
volume
fraq. length length effc’y
for
2”
for 3”
I. D.
I. D.
POfi
POfl
‘(cubic
1 feet) (Hz) (Hz) (inches) (Inches) (dB)
io.50 66
40 9 10 cNR>
91
0.76 55
40 560 137
92
1.00 45
40 3.60 9.70
92
1.25 40
40 2.75 7.30
92
1.60 36
40
Go
5.70
92
2.00 35
35 2.00 5.60
91
SEALED BOX,
0.5
VS.
1.5
CU.ft.
. .
.
.
20
50 .
IW
Hz
zm
5m
VT
f3, f3H fB ‘F ‘R ‘, p,
SPL
Total
Freq. Freq. Port Vented Sealed Port
POII
Mid-
box
tune front rear
tube
lube band
volume
freq. box
box
length length effc’y
volume volume for 3”
for 4”
I. 0. 1. D.
POfi
POfl
[cubic
(cubic (cubic
feet) (Hz) (Hz) (Hz) feet)
feet)
(inches) (inches)
(dt3)
0.75
55 160 95
035 040
3.60
760
91
1.00
45 140 60
0.40 060
5.25
10.3
66
I.25 42 130 77
0.5 0.75
4.20 6.50
69
1.50
37 130 66
0.50 1.00
_
--.---------
6.W
11.7
67
-.~ --..- ~_
.--....-
_~~_..-_
-.
1.75
35 130 65
0.5 1.25
6.60
13.1
66
-~
2.00
30 120 60
0.45 1.55 9.50 cNR>
65
[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
BANDPASS
BOX,
1.25 VS.
1.75
Cu.ft.
-31-
Sensitivity (SPL)
96
dB, 2.83vllm
93
dB.
lW/lm
Woofer outline drawing
FREnENcY (Hz1
Anechoic
woofer response
‘2.0
1.5
Smooth frequency roll-off and excellent transient response
Jam on it!
vcR”M wfls
,-.-..
cOMMY!~..__._ . . . . . ..^ _....:.:__._.... -.- ._.. -- . .._. .:......_-.____.._____-
. _.. .
0.75
Somewhat boomy due to bump in response @ 100 Hz
_.
2.0
Smooth frequency response and good transient response
-___
SINGLE-YEW
BANWAS WMJME btkt COMME;WT$
Jill_ .~
_ 3
,.,k
_Y 11 -i .vI
ljYLYY
.~ ,-,- y__-,_.,“,-_
~.,yI~,
Stmfl &.xX
I
~~1
1.25
A “one-note” sound due to limited bandwidth
_
Mwt aCcwa(tr
3.5
Wide frequency response but low efficiency
Pounder
1.75
Narrow bandwidth acceptable for nearly everyone -
gg&
on it!
*
(Parameter values may deviate slightly in production units but the perceived performance variations will be negligible.)
-32-
VENTED
BOX,
0.75 vs. 2.0
cu.ft.
110
,m.._-__-__________‘____________
a
,,
. .
. .
20
SO
loo
Hz
200
VT
f31.
f3H
ft3 vF v, p,
p,
Total
Freq.
Freq. Port Vented Sealed Port
POti
Mid-
box
tune front rear
tube tube
band
volume
freq. box
box
length length effc’y
VOIUnla
volume for 3’
for 4”
I. D. I. D.
(cubic
POti POfi
(cubic (cubic
feet) (Hz) (Hz) (Hz) feet) feet)
(Inches) (Inches)
(da)
0.76
CURD
1.00 56 160
95 0.50
0.50
2.00
4.50
91
1.25 52 140
65 0.65
0.60 1.90
4.25 92
1.50 50 130
76 0.75
0.75 1.90
4.50 92
1.75. 42 120
70 0.75
1.M)
3.00
6.25 90
3.50 24 105
50 0.75
2.75 6.00
15.1
64
u.ft.
0
w
-
_,,J - - - - - _ - _ _
_
.a#’
,A_
“‘<,_ - - - _ - - _ _
I
,”
20
50
loo IQ
2w
503
[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
-33-
Nominal diameter
Magnet weight
Nominal imoedance
DC resistance
IRe)
Resonance frequency (fs)
Total Q factor (Qts)
Mechanical Q (Qms)
Electrical Cl (Qes)
Eauivalent air volume
IVas)
Air volume
disalacement
Effective cone area (Sd)
Compliance (Cms)
Moving mass (Mms)
Voice coil diameter
Voice coil former material
Voice coil induct’ce
(@400Hz)
Linear excursion (Xmax)
Force factor IBI)
Acoustical efficiency (No)
Continuous power
(Per
Sensitivity (SPL)
15.0
In
(380mm)
40 02
(11409)
4D
2.08
f-l
24 Hz
0.38
7.10
12.1
ft’
(342
Itr’s)
0.35
ft’
(9.9
Itr’s)
132
in2 (O.O86m*)
3.1 x 10’ M/N
4.8 oz
(1359)
2.0”
(50.8mm)
Kapton polymide
1.50
mH
0.25 in (6.4 mm)
10.2 Tm
1.13 %
Woofer outline drawing
8
:/
rl!F*
i /
i/
/./.
:
j
i
ii
ii
j.j.
.._..._.
jj
ii
/f
r
if
i:
ji
i
/
j;
jj
Ii
jj
ii
ij
:i
f p
I
1
94
dB, lW/lm
1
Anechoic woofer response
SEALED BOX
Somewhat boomy sound
___-._
____
Decent frequency response with excellent transient response
-_____
Well balanced frequency response, transient response, and bandwidth
1
A little boomy but very strong low fret
Carefull - although attractive size (small) it is very boomy
LOUD!! - narrow bandwidth but high efficiency
l (Parameter values may deviate
slight@
in production units but the perceived performance variations will be negligible.)
v, If, ISPL
Total
box
VOI
_LL
(cubic
feet) (Hz) (dB)
Total
Freq. Freq. Port Vented Sealed
Port
POrt
Mid-
box tune front
raw
tube tubs
band
volume freq. box box
length length effc’y
volume volume for 4”
for
5”
I.
0.
I. D.
POfi
poti
(cubic
(cable (cubic
feet) (Hz) (Hz) (Hz) feet)
feet)
(inches) (inches) (dB)
0.75
<NR>
1
.oo
$R>
1.50 62
200 110 090 060
075 125 95
2.00 55
150
so
‘1.10
0.90 0.75
‘2.25 94
_
3.50 43
120 70 2.0
1.5
0.75
1.75
94
6.00 25
95 50 2.0
4.0 3.80 6.90 88
VENTED BOX,
1.5
vs.
3.0
CU.ftL.
110
BANDPASS BOX,
3.5
vs.
6.0
cu.ft.
100 I!2
ZOO
5ul
[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.
]
cNR>
= NOT A RECOMMENDED APPLICATION
-35-
If you have questions regarding the Blaupunkt PC woofer products and/or installation,
please fill out this sheet and return by fax or mail. A davtime teleohone number is a must;
lease be sure to include it! (At this time we can onlV
orovide answers in English.)
FAX OR MAIL TO:
BLAUPUNKT TECHNICAL SUPPORT
2800 SOUTH 25TH AVENUE
BROADVIEW, IL 60153
(FAX) 708-450-8511
(VOICE) 708-865-5200
NUMBER OF PAGES TOTAL:
FROM:
NAME:
COMPANY:
STREET:
CITY & STATE:
ZIP CODE:
TODAY’S DATE:
DAYTIME PHONE:
DAYTIME FAX:
I I
1. What enclosure type do you have or want?
1 I
sealed
1
1 vented 1 1
bandpass
1
I
isobaric
[ I
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
I I
square
6.
What is the total cubic volume of the enclosure you have or want?
(Maximum h x w x
d)
[
I cubic feet [ I liters
7.
How much amplifier power are you applying to each woofer7
8.
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:
.
-36-
.
-37-
@ BLAUPUNKT
Bosch Group
Robert Bosch Corporation
Sales Group - Blaupunkt Division
2800 South 25th Avenue, Broadview, Illinois 60153
Division Blaupunkt de Robert Bosch Inc.
Mississauga, Ontario Canada
L5N IRI
Copyright 1995 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., April 1995
PI-147
395
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