Tighten up both power input terminals, and double check for perfect fit of both main
cable leads!
ADJUSTMENT OF THE INTERNAL CROSSOVER
OPERATION MODE
Before you power up your amplifier, you must select and set the appropriate ope-
ration mode first. The OPERATION MODE is set, depending on the speaker system
connected to the corresponding channel pair of the amplifier. For example select
highpass (HI), 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 (LOW), if the channel pair is intended to drive a subwoofer system.
Highpass or lowpass filtering allows the connected loudspeakers to work in the fre-
quency band they can reproduce best.
HIGHPASS CROSSOVER FREQUENCY ADJUSTMENT
For satellite speakers, set the operation mode slide switch to its "HI" position and
then adjust the highpass crossover frequency point, using the "HI PASS" crossover
frequency control potentiometer.
Depending on the effective cone surface and the power handling of the installed
'satellite' speaker system, it is recommended to find a suitable high-pass cross-
over frequency point 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, depending on what is more important for you!
Note: If the highpass crossover frequency point for a given satellite system is set
too low, the speakers will be mechanically overdriven already by low volume levels.
LOWPASS CROSSOVER FREQUENCY ADJUSTMENT
Set the operation mode switch to its "LOW" position, to drive a subwoofer system.
The LOW PASS cut-off frequency point must be played by ear, i.e. since this cros-
sover frequency point is mostly a matter of personal taste. As a rule of thumb, set-
tings in a range between 60 to 90 Hz will render best sonic results. In general, set-
ting 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 'boo-
ming' bass sound and reduced low end extension.
INPUT GAIN CONTROL ADJUSTMENT
Before you start, you MUST set all tone controls (Bass, Mid, Treble, Loudness etc.)
and the fader on the head unit to their 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 subwo-
ofer system (if applicable!).
19
SPA2200 4200 Manual 23.05.2002 13:53 Uhr Seite 19
