17
ADJUSTMENT OF THE CROSSOVER
OPERATION MODE
Before you power up your amplifier, you must select and set the appropriate
operation mode first. The operation mode has to be set, depending on the speaker
system connected to the corresponding channel pair of the amplifier. For example
select the highpass (HPF) setting of the CROSSOVER slide-switch, if the speaker
system driven by the corresponding channel pair is a component-, coaxial- or
triaxial- type. Or else, set the operation mode switch to lowpass (LPF), if the channel
pair is intended to drive a subwoofer system.
Highpass or lowpass filtering allows the connected loudspeakers to work in the
frequency bands they can reproduce best, reducing mechanical stress.
HIGHPASS CROSSOVER FREQUENCY ADJUSTMENT
For satellite speakers, set the operation mode slide switch to the “HPF position and
then adjust the highpass crossover frequency point, using the potentiometer „FREQ“,
to set a desired x-over frequency. Depending on the effective cone surface and the
power handling of the installed ‘satellite’ speaker system, it is recommended to set
the x-over frequency in between 50 to 150Hz. This setting must be determined by
ear, since it represents a compromise where either midbass reproduction or power
handling has to be sacrificed!
Note: If the highpass crossover frequency is set too low, the speakers will be
mechanically overdriven by low volume levels. If this frequency is adjusted at a point
too high, too much mid/bass is cut off and the music played back will sound thin.
LOWPASS CROSSOVER FREQUENCY ADJUSTMENT
Set the operation mode switch to its “LPF” position, to drive a subwoofer system.
The lowpass crossover frequency should be played by ear as well, i.e. since this
crossover frequency point is mostly a matter of personal taste and also depends
on the vehicle itself and the subwoofer connected to the amp. As a rule of thumb,
settings in a range between 60 to 90 Hz will render best sonic results. In general,
setting the lowpass crossover frequency point too low, will result in a weak and
muddy sounding bass, while setting this crossover frequency too high will result in
a ‘booming’ bass sound and reduced low end extension.
INPUT GAIN LEVEL ADJUSTMENT
Before you adjust the input gain level of the amp, to get the best signal to noise
ratio from your amp / headunit combination, you must set all tone controls (Bass,
Mid, Treble, Loudness etc.) and the fader on the headunit to the neutral or center
positions.
Now turn all input gain controls of the installed amplifiers anti-clockwise to their
minimum positions and ALWAYS start with the channel pair, that drives the
subwoofer system (if applicable).
SPA2200-4100Z Manual D+E 17
22.04.2005 14:35:27 Uhr
