Bedienungsanleitung Rodek r 680 a 2 (Seite 23 von 28) (Deutsch, Englisch)

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4. CROSSOVER SETTINGS

4.1 MINIMUM IMPEDANCE LOAD

The output stages of the RODEK R680A2 multichannel amplifier

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. We put emphasis on

the fact, that the amplifier might suffer from thermal shut-down

or even damage, if these recommended minimum impedance

load ratings are not considered appropriately.

4.2 SELECTING THE OPERATION

MODE

The R680A2 is multi-channel concept amplifier with integra-

ted active crossovers and thus, offers different amplification

modes which can be set by the operation mode slide switches.

Three of these switches can be found on the R680A2 amp.

These switches enable you to configure each stereo channel

pair to work in either in fullrange, highpass or even bandpass

mode. Therefore - before you get started with the settings of

crossover frequencies and input gain adjustments - you must

select the appropriate operation mode for each channel pair of

your RODEK amplifier, depending on the speaker system that

is connected and driven by the amp. 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 component- or

coaxial type, or BANDPASS in case of a kickbass 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 loudness featured on the head unit,

must be set to their respective neutral or center position.

Please take a look at the chart below, featuring the sugges-

ted high-pass cross-over frequency settings for coaxial- and

component speaker systems - and adjust the highpass control

of each channel pair that drives satellites speaker systems

accordingly. The most important factor for the individual adjus-

tment of the highpass crossover frequency is the reproduction

of mid-bass frequencies and the resulting power-handling of

the speaker system. This setting is always a compromise. Try

to find a highpass crossover 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, recommended

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

R680A2 Manual_E+D.indd 23R680A2 Manual_E+D.indd 23 07.07.2004 12:36:46 Uhr07.07.2004 12:36:46 Uhr

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