Blaupunkt Velocity Burning Desire II Mode D'emploi page 4

Usage options and loudspeaker connection:
Burning Desire II
Max power
4 ohms
Max power
2 ohms
Max Power
1 ohm
RMS power
4 ohms
RMS power
2 ohms
RMS power
1 ohm
Frequency response
Total harmonic
distorsion
Input impedance
Signal-to-noise ratio
Input sensitivity
Low pass filter
Bass boost
Subsonic filter
Dimensions
WxHxD (mm),
... with end-cap
Weight
Positive/negative connection
The cross section of the positive and negative cables must be at
least 25 mm 2 .
The positive cable between the battery and the amplifier must be
protected directly at the battery using the fuse holder that is
included (4 x 80A).
Note:
You must make sure that the fuse holder is protected effectively against
moisture.
Note:
In the case of longer supply lines to the vehicle battery, a second battery
can be installed alongside the amplifier in order to stabilise the voltage.
This must be installed by a professional workshop.
Use cable grommets to protect cables against sharp-edged holes.
Securely screw a standard 25 mm
rence-free ground connection point (bolt connected to the car
body, car body sheet metal) - though do not connect it to the
negative terminal of the battery. Scratch the surface down to the
bare metal at the point at which the ground contact is made and
apply graphite grease.
Connection examples
Connection of the voltage supply ................................................. Fig. 2
Connection to car radios with RCA output ................................... Fig. 3
Loudspeaker connections ...................................................... Fig. 4/5/6
GAIN control
You can use the GAIN control to adjust the input sensitivity of the Velocity
power amplifier to the output voltage of your car radio's preamp output.
The setting can be adjusted between 0.3 V and 8 V.
When connecting a car radio produced by another manufacturer, you
must adjust the input sensitivity in accordance with the information
provided by the manufacturer.
Please note that the GAIN control is not a control for adjusting the volu-
me!
Remote GAIN
Connection for the supplied wire remote control.
This makes it possible to remotely control the GAIN function.
1 x 2500 watts Fig. 4
1 x 3500 watts Fig. 4
1 x 4000 watts Fig. 5
1 x 1000 watts Fig. 4
1 x 1750 watts Fig. 4
1 x 2000 watts Fig. 5
10 Hz - 450 Hz
< 1%
(@ full rated power)
>20 kOhms
> 95 dB/A
0.3 - 8 V
40 - 300 Hz
0 - 12 dB (45 Hz)
20 - 55 Hz
473x268x58
573x279x58
7.5kg
2 negative cable to an interfe-
Preamp INPUT
Preamp inputs for the right and left channel. Please use high-quality
Velocity RCA cables for this connection.
Preamp OUTPUT
Outputs for connecting a second amplifier (formation of chains of
amplifiers). Please also use high-quality Velocity RCA cables for this
connection.
CONFIG switch (LP/FLAT, LP/LP, FLAT/FLAT, see Fig. 7)
Before installation, adjust the position of the CONFIG switch on the
power amplifier in order to set the frequency coverage of the signal that
is sent to the loudspeakers and the RCA output jacks.
LP/FLAT position: In this switch position, the bass range that is limited
by the crossover frequency control (LP FREQ) is sent to the subwoofer.
The frequency coverage that is predetermined by the car radio is
provided at the RCA OUTPUT.
LP/LP position: In this switch position, the bass range that is limited by
the crossover frequency control (LP FREQ) is sent to the subwoofer as
well as to the RCA OUTPUT.
FLAT/FLAT position: In this switch position, the frequency coverage up
to 450 Hz is used for the loudspeaker, and the frequency coverage that
is predetermined by the car radio is used for the RCA OUTPUT.
Note:
The SUBSONIC filter and BASS BOOST control do not have any function
in this position.
Crossover frequency control (LP FREQ)
If the crossover is activated (LP/FLAT or LP/LP) by adjusting the position
of the CONFIG switch, you can then use the LP-FREQ control to adjust
the crossover frequency of the filter anywhere between 40 Hz and
300 Hz.
Settings for a subwoofer
In order to obtain the best sound when a subwoofer is connected, the
subwoofer must only be fed with low frequencies, i.e. bass.
1. Firstly, turn down the GAIN control on the Burning Desire II to mini-
mum and set the LP-FREQ control to its centre position.
2. Now play some music on your car sound system that you are very
familiar with and that contains some low bass (e.g. pop music). Now
slowly increase the volume of the subwoofer by turning the GAIN
control on the subwoofer amplifier in a clockwise direction until you
feel that the sound of the music is well balanced, i.e. the bass is
neither too weak nor overpowering.
3. Now listen to the relationship between deep male voices and the
higher bass frequencies and also take note of the relationship bet-
ween the upper bass (kick bass) and the lower bass. The bass should
ideally sound crisp and have a clear low bass component, and male
voices should neither sound too weak nor should they billow out. You
can stop making adjustments if you are happy with the sound. If not,
move on to steps 4 and 5.
4. If male voices seem to billow out or the low bass is too weak, you
should turn the LP-FREQ control slightly towards minimum and then
continue making your adjustments as described in point 2 onwards.
5. If the bass sounds low but dirty and booming or the male voices
sound too weak, you should turn the LP-FREQ control slightly to-
wards maximum. Furthermore, you should set the phase control so
that the upper bass sounds as powerful as possible. Next, continue
making your adjustments as described in point 2 onwards.
If you want to precisely optimise the acoustic settings of the crossover,
we recommend you obtain advice from a Velocity dealer.
It is very important that you take into account the specifications of
the loudspeakers being used whilst you are adjusting the crossover.
Bass boost
You can adjust the bass output of the Velocity amplifier using the bass
boost control. The settings range covers 0 dB to +12 dB.
Subsonic filter
The subsonic filter is used when a subwoofer is connected to the
amplifier. It can be adjusted in order to protect the subwoofer against
mechanical overload due to low bass frequencies that fall outside our
hearing range.
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