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5.11 AC-Coupling

In some applications additional signal manipulations are desired, such as additional band equalizations.

For this purpose, an AC-Coupling can be placed before the loudness attenuator or speaker-attenuators,

attenuator is available at the AC-Outputs. The input-impedance of this AC-Inputs is 50k

Ω.

Figure 22. Diagram of AC coupling

5.12 DSO Applications

For DSO applications, DSO filter is available for additional processing after the speaker control. It is a 2nd

order Butterworth highpass filter with selectable flat mode. Figure 23 shows the diagram of the DSO that

includes an external RC network.

Figure 23. DSO diagram

To Output

ACINL

ACINR

ACOUTR

ACOUTL

From Input MUX

Filters

InGain

Speakers

ACIN

/FILO

SE3IN

/AC2IN

ACOUT

/AC2OUT

External RC network

To

output

Gain Control

From speaker