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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
The switching line must be connected when connection is carried out
using the RCA jacks or the loudspeaker jacks of the car radio.
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!
INPUT
Preamp inputs for the right and left channels. Please use high-quality
Velocity RCA cables for this connection.
INPUT MODE input selector switch
In the CH1+2 and CH3+4 switch position, each channel (CH1-CH6) of
the amplifier can be operated separately. The mono/stereo switches
must be set to the ST (stereo) position.
In the CH1+2/CH3+4 or CH3+4/CH5+6 switch position, the amplifier
channels are connected together at the input side.
Switch position CH1+2/CH3+4 connects CH1 to CH3 and CH2 to CH4.
Switch position CH3+4/CH5+6 connects CH3 to CH5 and CH4 to CH6.
You can achieve various input/output groupings by combining the switch
settings.
Some examples of the most popular applications are provided in Fig. 5.
MO / ST input selector switches
In the ST switch position, channels 1+2, 3+4 and 5+6 operate in ster-
eo mode.
In the MO switch position, channel 1 is connected to 2, channel 3 is
connected to 4, and channel 5 is connected to 6 at the input side.
Examples of this are provided in Fig. 5.
LP / HP / FULL 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 (FULL). If
you select the FULL 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
+12V
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
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 activated in order to protect the subwoofer against
mechanical overload by low frequencies that are 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.
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