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4.1 MINIMUM IMPEDANCE LOAD
The output stages of the RODEK amplifiers are designed
to give you extraordinary output power into 4 or 2 ohms
loads in normal stereo configurations. In bridged mode,
the minimum impedance load is 4 ohms. The amplifier
might suffer from thermal shut-down or even damage, if
these recommended minimum impedance load ratings
are not considered appropriately. The R1500A2 is stable
into 2 ohms.
4.2 SELECTING THE OPERATION MODE
The RODEK amplifiers feature an active crossover sec-
tion with full versatility and thus, offer different amplifi-
cation modes, which can be set by the operation mode
slide switch(es). The operation mode switch enables you
to configure each stereo channel pair to work in either
fullrange, highpass or even bandpass mode. Therefore
- before you get started with the settings of crossover
frequencies and input gain adjustments - you must se-
lect the appropriate operation mode for each channel
pair, depending on the speaker system that is connected
and driven by the amplifier. This will make sure that every
speaker system is only working in its proper frequency
operation range, for which the speaker was designed.
For example select HIGHPASS, if the speaker is a com-
ponent- or coaxial type, or BANDPASS in case of a kick-
bass or subwoofer system - and finally FULL(range) if
the passband frequency of the stereo channel is already
controlled by a head-unit with an integrated DSP based
active crossover.
4.2.1 HIGHPASS FOR COMPONENT
AND COAXIAL SPEAKERS
Before you start your adjustments, all tone controls (i.e.
Bass, Treble), fader/balance and the loudness function
featured on the head unit, must be set to their respective
neutral or center position.
Please take a look at the chart below, stating the recom-
mended high-pass cross-over frequency settings for
coaxial- and component speaker systems - and adjust the
highpass control of each channel pair that drives satel-
lites speaker systems accordingly. The most important
factor for the individual adjustment of the highpass cross-
over frequency is the reproduction of mid-bass frequen-
cies and the resulting power-handling of the speaker
system. This setting is always a compromise. Try to find
a highpass crossover frequency point, that will suit your
personal listening preferences and - at the same time -
also considers the physical (cone excursion) capabilities
of your speakers best.
Satellite speaker system, front door mounted, recom-
mended highpass frequency
10 cm Coaxial- or Component System 90 - 120 Hz
13 cm Coaxial- or Component System 80 - 100 Hz
16 cm Coaxial- or Component System 60 - 90 Hz
Satellite speaker system, rear mounted, recommended
highpass frequency
10 cm Coaxial- or Component System 100 - 150 Hz
13 cm Coaxial- or Component System 120 - 150 Hz
16 cm Coaxial- or Component System 130 - 150 Hz
4. CROSSOVER SETTINGS
R1500-4100A2 Manual.indd 27R1500-4100A2 Manual.indd 27 07.07.2004 10:59:11 Uhr07.07.2004 10:59:11 Uhr
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