sir, ung ac3 out ng ld is intended solely for ac3 input of ampli/avrs, mostly u can find this feature in old model amps/avrs. if dolby digital lds are played in your kenwood, signal passes thru this ac3 out for ac3 input of avrs. kung walang ac3 in ung avrs mo, u need an outboard ac3 rf demodulator to convert the signal from ur ld para maging digital signal, only then, can u pass the digital signal to the digital input of ur avr. do not connect the ac3 out of ur ld directly to the digital input of ur avr. ac3 feature of ld player is intended solely for ac3 lds.