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5. ADJUSTMENTS & SETTINGS
5.1 ACTIVE CROSSOVER
ADJUSTEMENT
This amplifier comes without internal electronic crossovers.
All crossover frequency adjustments must therefore be ac-
complished by using either an external active crossover, or
a DSP headunit, that offers the necessary filtering and/or
crossover functions in the digital domain.
5.2 RECOMMENDED CROSSOVER
FREQUENCIES
Please take a look at the chart below, featuring the sugge-
sted high-pass cross-over frequency settings for coaxial-
and component speaker systems. These are recommenda-
tions, and you can use them to find suitable adjustments
on external devices that must be set appropriately:
Satellite speaker system, front door mounted, recommen-
ded highpass frequency
10 cm Coaxial- or Component System
90 Hz
13 cm Coaxial- or Component System
80 Hz
16 cm Coaxial- or Component System
60 Hz
Satellite speaker system, rear mounted, recommended hig-
hpass frequency
10 cm Coaxial- or Component System
100 Hz
13 cm Coaxial- or Component System
120 Hz
16 cm Coaxial- or Component System
130 Hz
Subwoofer, recommended lowpass frequency
For any given subwoofer, the low-pass cut-off frequency should
be set in between 60 to 90 Hz. This frequency adjustment has
to be entirely determined by ear. Try to find lowpass crosso-
ver frequency setting, that gives you a “full-bodied” bass re-
production with enough impact in the upper bass range.
Note: If the lowpass crossover frequency is set too low, the
sound will have a tendency to sound extremely soft and low-
end heavy!
5.3 ADJUSTMENT OF INPUT GAIN
To reach a maximum noise-free dynamic headroom from each
individual head unit/amplifier/speaker combination, it is im-
portant to set the respective input gain controls correctly.
The input level settings determine the actual signal-to-noi-
se ratio, and they are also responsible for obtaining the ma-
ximum distortion-free SPL (sound pressure level) from your
specific setup.
Turn-on your head-unit and set the volume control to ap-
proximately 3/4 of full volume, while playing a dynamic track
from a CD. Slowly increase the LEVEL adjustment control of
the channel pair sect ion that drives your subwoof er sy-
stem. Open the gain until you can just hear distorted bass
sounds from your sub. Now you reduce the volume level of
your head unit to a “normal” listening level and “add” all the
remaining channel pairs, by increasing the gain of the corre-
sponding level controls. You should aim at a balanced sound
with a slight emphasis of the bass range. All remaining chan-
nels, no matter if this concerns rear mounted coaxials, com-
ponent- or kickbass systems installed in the front doors -
must be balanced against the main level setting of your sub-
woofer.
R650FRD_Manual 2003 25.04.2003 17:11 Uhr Seite 20
