Blaupunkt V7000 User Manual
/
tt Audio Amplifier with
Noise Reduction
Ampri
audio
de
distorsiun THD
4 x 40
+
2 x 80 +
et
R6duction
1 x
20 Watts
avec
de bruit HUSH@
limitation
Ampfificador de audio 4 x 40 + 2 x 80 + 1 x 20 vatios con
ci6n
de
distorsi6n THD
Made in the U.S.A.
y
Reduccidn
de Ruidos HUSH@
Bosch Group
TABLE OF CONTENTS (ENGLISH)
PAGE
Introduction, Owner’s record, and key features
Velacity
Installation and safety precautions
Amplifier controls and operation
Amplifier connections and interface
Speaker configurations
Recommended system configurations (4)
Final installation (Mounting and ventilation, use of internal crossovers, fusing,
Trouble-shooting guide
Limited warranty (United States)
Accessories
Other notes
Technical specifications
Introduction, Archive du proprietaire,
Velocity comprendre le fonctionnement de I’amplificateur (caracteristiques de limite de distorsion
Montage et mesures de
Commandes de I’amplificateur et fonctionnement
Raccordements de I’amplificateur et interface
Configurations de speaker
Configurations des
Montage final (Montage et ventilation
Guide de
Garantie limitee @tats Accessoires
Autres notes
Specifications
amplifier features (Distortion Limiting, HUSH noise gating and reduction,
Voltage Controlled Amplifier’s)
power and speaker wiring)
caracteristiques-cl6
de signal, reduction de bruit HUSH et filtre de
securite
systemes
croisements internes et des
depannage
(4)
adequats,
commances
Unis)
.
Porte
d’expansion descendante, VCA)
interface du signal d’entree, utilisation des
d’intensite, mise a la masse,
fusibles)
3
4-6
7
8
9
10
11-14
15-17
18
19
54
54
55
20
21-23
24
25
26
27
28-31
32-34
35
36
54
54
55
INDICE
Introduction,
Characteristics del amplificador \(e/oc;ry
Precauciones de instalacidn y seguridad
Controles y operation del amplificador
Conexiones del amplificador e interfase
Configuraciones del speaker
Configuraciones recomendadas del sistema (4)
lnstallacidn
Gula para
Garantia limitada (EE. UU.)
Accesorios
Otras
Especificaciones
DE MATERIAS
archive del del propietario, caracteristicas del amplificador Velocity
y reduction de ruido HUSH, amplificadores de voltaje controlado, configuraciones)
final (Montaje y ventilaci6n adecuados, uso de truces internos, fusibles apropiados,
cableado
de alimentacidn y de
solucionar problemas
Notas
(ESPAfiOL)
(Limitaci6n
10s altavoces)
de
distorsion,
circuit0 de conduccidn
2
37
selectiva
38-40
41
42
43
44
45-48
49-51
52
53
55
INTRODUCTION
Congratulations on your purchase of the world’s finest brand of car audio amplifiers. We have
invested tremendous effort in the design process of the new
to achieve superior musical performance. Leading edge technologies such as Distortion Limiting
and
HUSHTM
reproduction and enhancement market, have been implemented into your
which has been designed and assembled in the United States of America. For maximum
performance and reliability we highly recommend that your new VELOC/w”’ series amplifier be
installed by an authorized Blaupunkt dealer. We also recommend Blaupunkt cd or cassette units,
speaker systems, and accessories to expand the listening experience which might be limited by
lesser quality components.
Finally, we remind you to practice safe listening habits using common sense. Continuous exposure
to listening levels over 100 decibels may cause permanent hearing loss. Many high power, multi-
speaker systems today are capable of Sound Pressure Levels exceeding 130
noise reduction and gating, previously found only in the professional audio sound
VELOC/TT”series
VELOCITYT”
amplifiers in order
amplifier
dB.
. .
OWNER’S RECORD
del and warranty numbers are located on the bottom of the unit. Please record these
s in the space provided below. Refer to these numbers whenever you call upon your
Blaupunkt dealer.
MODEL:
WARRANTY NUMBER:
PURCHASE DATE:
DEALER/INSTALLER:
KEY FEATURES
DISTORTION LIMITING (THD,) reduces the annoying acoustical pops and cracks present during
high signal levels. It is acoustically transparent until high signal levels thus providing protection
for tweeters since high level distortion products are not allowed to enter the speakers.
HUSHTM
hiss that may be picked up in the installation or from recorded music played back via AM, FM,
or even compact disc.
MULTI-MODE SPEAKER CAPABILITY allows the consumer to cost effectively create a
satellite/subwoofer system with remarkably good performance from a single amplifier.
REMOTE GAIN AND HUSH CONTROLS are available using the optional remote control, RM-1.
This remote can change gains of the entire system (multiple amplifiers) or only a subwoofer
amplifier if so configured.
TONE AND BASS BOOST CONTROLS provide frequency response tailoring for the end listener
that cannot be achieved from the radio controls.
NOISE GATING AND REDUCTION offers tremendous noise reduction for background
1 OHM STABILITY allows for paralleling of multiple speakers for increased sound pressure level.
CONTINUOUSLY VARIABLE HIGH-PASS/LOW-PASS CROSSOVERS allow you to better
istribute amp power thus lowering system distortions and increasing system sound loudness.
IDE RANGE INPUT GAIN CONTROLS (0.3 - 6.0 V
voltages, even directly from the high level outputs of many factory radios.
rms)
allow for a variety of radio interface
3
UNDERSTANDING YOUR AMPLIFIER’S FEATURES
WHAT IS AN AMPLIFIER?...
An amplifier, by definition, is a device that receives a small audio signal on its input and reproduces
it with larger voltages (or current) on its output. Ideally there should be no internal modifications of
the signal other than voltage or current level. If there are any changes in the signal character it is
considered a “distortion” of the input signal.
A perfect amplifier will be able to reproduce any output voltage regardless of input signal level, but
this is impossible due to upper limits created by the voltages found in a car, typically 12 - 15 volts
DC. The amplifier’s output stage cannot swing voltages that exceed the upper limit commonly
referred to as the voltage “rails”,
as in locomotive train tracks. If the input signal is driven to high
levels, the outputs try to follow this path but crash into the “rails” thus turning musical sine waves
into very unmusical square waves.
Here is where your new Blaupunkt VELOCIWTMamplifier is
uniquely impressive.
4
The Blaupunkt
VELOCITYTM
series of amplifiers have a very unique feature called Distortion Limiting
(THD,) which tolerates high input voltage levels but prevents ugly sounding distortion products
common to nearly all other amplifiers. An input voltage sensing network looks at the incoming
signal and adjusts the feed-through gain of the amplifier so quickly that high level bass notes
cannot drive the amp into distortion yet lower signal level mid and high frequencies pass throu
without gain modification. This is done within milliseconds, so “gain pumping” acoustical
byproducts of inexpensive audio limiters are never encountered. Below is a visual description of a
high level audio signal passing through a typical car audio amplifier and then through the new
Blaupunkt
VELOCITYTM
amplifiers.
DISTORTION LIMITING SIGNAL CHARACTERISTICS
Low Volume
Typical
Amplifier
High Volume
;FII+
jz++
BlaupunM
6/8upunkt
with
Typical Amplifier
with THIX
TH[x
HUSHm
High quality compact discs provide very wide range volume levels with low background hiss levels.
Unfortunately, the car is a very noisy electrical environment so vehicle noises (pops and alternator
whine) often creep into the audio signal somewhere in the installation. Although mid and high level
music tends to mask background noises, vehicle noises become quite audible, and annoying, during
quiet music passages. This problem has been known for some time in the professional audio field
so a device known as a “Noise Gate” has been used to mute the signal path during quiet passages.
The problem with this system is the “choppy” sound as the Gate opens and closes with music
which is known as “pumping”.
The
which effectively expands the dynamic range of the signal thus pushing down the background
noise in relation to the desired signal. Also, the
point that smoothly moves up and down so none of the dramatic “pumping” of the desired signal is
experienced as with a noise gate. An added benefit is the ability of the
noise on recorded music such as cd’s, cassettes, and even on the AM/FM car radio.
NOISE REDUCTION AND DOWNWARD EXPANSION GATING
HUSHTM
noise reduction circuits avoid this “pumping” by the use of a downward expander
HUSHTM
INPUT/OUTPUT ELECTRICAL TRANSFER FUNCTION
circuits offer a continuously variable set
HUSHTM
circuit to reject
VERY LOW
MUSIC SIGNAL
LOW LEVEL
MUSIC SIGNAL
MID
LEML
MUSIC SIGNAL
OUTPUT
SIGNAL
-80
OUTPUT SIGNAL
SIGNAL TO NOISE CHARACTERISTICS
OUTPUT SIGNAL
-60
-40 -20
OdB
5
VCA’s
Used in Professional Audio for some years, but totally new to the car audio world, is a remote
control gain devices called a “VCA”. This is a small integrated circuit that can control the feed-
through gain of a circuit from a remote location. It operates much like an external “hand” that
controls the signal flow through a circuit, much like a simple water flow valve.
(Voltage Controlled Amplifiers) & ELECTRICAL PIN-OUTS
VCA CONTROL VOLTAGE
SIGNAL
VCA OPERATION
Many people want to have a remote control for a high power amplifier in order to control the
loudness of a subwoofer amplifier independently of the radio. Remote mounting of an input gain
control would be a major problem with most car audio amplifiers because of the likely noise
intrusion into the signal path.
With a VCA circuit on the input of an amplifier, the gain can be controlled remotely but is done
with moderate level DC voltages (O-1 5 volts) that are insensitive to noise (noise is an AC voltage).
Using the optional Blaupunkt remote control (RM-1) you simply plug the remote into the amp to
control the overall gain. For people wanting to interface with highly custom installations, you can
use an RJ-11 telephone jack and variable resistor to achieve similar results using the circuit below,
This is & recommended for very experienced Blaupunkt installation centers for it may void the
warranty of the amplifier otherwise.
INWTS
------+
I-
/J
I
OdB
-20
-40
-60
-80
-100
m
-100
VCA TRANSFER FUNCTION
-80
-60.
+
-40
CONTROL
VOLTAGE
-20
K
THDL
LIMITING
ode
6
l -
REMOTE GAIN
CONTROL
ELECTRICAL
PINOUT
. ..--
INSTALLATION AND SAFETY PRECAUTIONS
!! WARNING !!
8
ALWAYS DISCONNECT THE (+I LEAD FROM THE BATTERY OF THE
VEHICLE BEFORE DOING ANY INSTALLATION WORK!
8
DO NOT INSTALL THIS UNIT IN THE ENGINE COMPARTMENT!
8
DO NOT RUN WIRES UNDERNEATH OR OUTSIDE THE VEHICLE!
!! SAFETY PRECAUTIONS !!
._
nalyze
the mounting location carefully to avoid damaging gas tanks, electrical wires, and/or
draulic lines.
2.
Every effort should be made to provide adequate ventilation, protection from engine heat, direct
sunlight, rain, and dirt.
3.
This unit is designed for use only with 12 volt DC negative ground
4.
This unit is NOT designed for use with common ground speakers. All speakers MUST be
connected to both positive and negative terminals.
5.
Fuse the +
Fuse the line as close to the battery as possible. Always use the fuse supplied with this amp
and never increase the fuse size (for example, 10A) in case it does blow.
6.
Be sure all power grounds are clean.
7.
Make wiring connections from one component to the next, making sure that you plug radio or
equalizer outputs to amplifier inputs and not outputs to outputs.
8.
Do not run power cables and audio (RCA) cables together. You can minimize noise radiation by
running the power cables on one side of the car and the signal cables on the opposite side.
12V
lead of the amplifier before making any electrical connections in the vehicle.
Scrape off paint if necessary to guarantee this.
vehiclt
systems.
9.
Avoid sharp edges and door jambs when running the wires.
be used protect the wires when they are routed through holes.
10. Make sure all wire connections are secure and protected so there is no danger of nicks or
pinched electrical lines.
11. FOR SAFE DRIVING keep the listening levels low enough not to mask outside noises.
12. Avoid playing your car audio system for long periods of time at high listening levels when the
engine is not running. This will prevent unnecessary battery drain.
Electrical tape or grommets should
7
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