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Some questions on SSM2305

Good evening

Actually, I have two problems using device SSM2305. I have connected pin: IN + and IN - to 50K Ohm potentiometer (respectively to the second and third out of the potentiometer). I have inserted two 100n Farad ceramic capacitor between potentiometer and device. The audio source is linked by jack Mono (connected to first and third pin of potentiometer). When I switch on the power source (about 5 volt) and I connect audio input to SSM2305, device doesen't generate correctly audio out if I exceed the central position of potetiometer.The out seems to be zero volt.

Measuring the potentiometer impedance, I obtained this strange values:

- 13.4 Ohm resistance between pin 1 and 2.

- 13.4 Ohm resistance between pin 2 and 3 (the same as above).

If I disconnect the audio source, maintaining the power supply, I obtain again the same resistance value between pin 1 - 2 and 2 - 3.

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