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Connection examples
Connecting the voltage supply ................................................... Fig. 2
Connection to car radios with RCA output ................................. Fig. 3
Connection to car radios with loudspeaker output .................... Fig. 4
Loudspeaker connections .......................................................... Fig. 5
Tri mode ...................................................................................... Fig. 6
Connecting the wire remote control (REMOTE GAIN) .............. Fig. 7
The switching line must be connected when connection is carried out
using the RCA jacks or the loudspeaker jacks of the car radio.
Tri mode
You can operate 2 loudspeakers and at the same time switch on a
third loudspeaker in mono mode (bridge mode) (see Fig. 6).
LEVEL control
You can use the LEVEL 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 LEVEL control is not a control for adjusting the
volume!
REMOTE GAIN
Connection for the supplied wire remote control (5 m).
This gives you the convenience of controlling the bass level remotely
for channels 3+4 (see Fig. 7).
If you want to use the remote control, the device must be operat-
ed with the low-pass filter activated (crossover switch set to po-
sition LP).
INPUT
Preamp inputs for the right and left channels. Please use high-quality
Velocity RCA cables for this connection.
OUTPUT
Outputs for connecting an additional amplifier (formation of chains of
amplifiers). Please also use high-quality Velocity RCA cables for this
connection.
LP / HP / FLAT switch
Before installing, adjust the crossover switch on the power amplifier to
set the low pass filter (LP), high pass filter (HP) or full range (FLAT). If
you select the FLAT position, the full frequency response will be used
at the output.
Using the integrated crossovers is particularly useful in the case of
multi-channel sound systems with a separate subwoofer.
In order to obtain the best sound when a subwoofer is connected, the
subwoofer must be separated as far as the frequencies it receives are
concerned, i.e. it must only be fed with low frequencies (bass).
To ensure that this is the case, select LP and use the crossover fre-
quency control to adjust the upper frequency to between 40 Hz and
160 Hz. This ensures that every subwoofer is optimally separated as
far as the frequencies it receives are concerned.
If HP is selected, you can use the associated crossover frequency
control to adjust the lower cut-off frequency to between 40 Hz and
600 Hz.
If you want to precisely optimise the acoustic settings of the crosso-
ver, 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 cross-
over.
Crossover frequency control (LOW PASS + HIGH PASS)
If the crossover is activated (LP or HP) by adjusting the position of the
crossover switch, you can then use the corresponding control to ad-
just the crossover frequency of the respective filter to anywhere be-
tween 40 Hz and 160 Hz or 40 Hz and 600 Hz (i.e. continuously vari-
able setting). This control has no function in full range mode.
Settings for a subwoofer
In order to obtain the best sound when a subwoofer is connected, the
subwoofer must be separated as far as the frequencies it receives are
concerned, i.e. it must only be fed with low frequencies (bass).
1. Firstly, turn down the LEVEL control on the amplifier to minimum
and set the LOW PASS frequency 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
LEVEL control on the amplifier in a clockwise direction until you
+12V
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
upper bass and also take note of the relationship between the up-
per bass (kick bass) and the lower bass. The bass should ideally
sound crisp and have a clear low bass component, and male voic-
es 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 LOW PASS frequency control slightly towards min-
imum 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 LOW PASS frequency control
slightly towards maximum. Next, continue making your adjustments
as described in point 2 onwards.
If you want to precisely optimise the acoustic settings of the crosso-
ver, 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 cross-
over.
BASS BOOST
You can adjust the bass output of the Velocity amplifier using the bass
boost control. The settings range covers 0 dB to +15 dB.
SUB SONIC
The subsonic filter is used when a subwoofer is connected to the am-
plifier. It can be adjusted in order to protect the subwoofer against
mechanical overload due to low bass frequencies that fall outside our
hearing range.
Integrated fuses (FUSE)
The fuses that are integrated in the amplifier protect the power ampli-
fier and the entire electrical system in the event of a fault. If the fuse
needs to be replaced, never bypass/bridge the fuse and never replace
it with fuse types that are designed for higher currents.
Power-on indicator (POWER / PROTECTION)
Blue light: Power amplifier switched on, normal operating mode.
Red light: Power amplifier has been electronically deactivated due to
a fault.
Subject to changes.
Introduction (F)
Félicitations pour l'achat de cet amplificateur Car Audio haut de gamme.
En tant que promoteurs d'innovations dans le domaine de la hi-fi em-
barquée, nous avons le plaisir de vous offrir avec nos amplificateurs
de la classe D l'accès à une technologie prometteuse d'avenir.
Comparés aux amplificateurs analogiques traditionnels, les amplifica-
teurs de la classe D offrent une efficacité nettement plus élevée. Tan-
dis que l'efficacité des amplificateurs analogiques est de l'ordre de
60 %, nos étages de sortie numériques convertissent en son jusqu'à
80 % de l'énergie acheminée. On pourrait appeler ce résultat « Plus
de son à la sortie avec moins à l'entrée ».
De plus, les amplificateurs numériques chauffent si peu qu'ils peuvent
être montés à des endroits insuffisamment aérés, sous les sièges par
exemple.
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