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PT2353 V1.2

- 8 -

March, 2006

Satellite + Subwoofer 3-Speaker System Electronics Crossover IC

PT2353

FILTER

The main channel of PT2353 includes the high pass filter which is used to filter out the main speaker’s

low frequency characteristics. The filtered signal is then combined with the subwoofer low pass filter

characteristics. This High Pass Filter is of Sallen Key Type with a pass band gain equivalent to 0dB.

Adjustment of the crossover frequency is made via the two external capacitors. Please refer to the

figure below.

REF

LOUT/ROUT

C

C

CL2

CL3

CL1

Signal

In

－

+

Subwoofer channel mixed from the Main Channel also uses the Sallen Key Type Low Pass Filter to

filter out the high frequency characteristics. Two external capacitors can be used to adjust the

crossover frequency. Please refer to the diagram below.

SOUT

C1

C2

Signal

In

REF