Tel: 886-2-66296288

Fax: 886-2-29174598

URL: http://www.princeton.com.tw

PT2389 V1.5

- 11 -

July, 2006

5-Mode Preset Equalizer IC with Bass Booster & 3D Effect

PT2389

TREBLE AND BASS ADJUSTMENT

It is general knowledge that different individuals have different listening preferences. The application

circuit of PT2389 included in this specification has been designed for the taste general listening public;

however, you can make the necessary adjustment to suit your personal taste. Please refer to the

sections below.

TREBLE ADJUSTMENT

The Treble adjustment is made by changing the value of the 2 capacitors connected between

TL -- OUTL pins and TR -- OUTR pins. Please refer to the diagram below.

As the capacitor value becomes bigger, the treble of the gain frequency curve is shifted down.

Likewise, as the capacitor value becomes smaller, the treble gain frequency curve shifts the opposite

direction. Referring to the diagram above, we see that at 8dB, different capacitor values exhibit

different frequency responses. Capacitor value 1800 pF has a lower frequency gain response than

1200 pF capacitor.

Hz

TL – OUTL Capacitors vs. Frequency Response

Note:

1200pF

1500pF

1800pF

1800pF

1500pF

1200pF