audio codec

Hi All, I have Hikvision DS-2183G2-IU with a built-in microphone installed in a hall and I'm facing bad sound clarity on playback. My question is if I switch the codec to AAC instead of G711 does it change the audio clarity to better? Shall I keep H265 with AAC or switch to H264 with AAC...

I have three PTZ optics cam with an audio codec (AAC), and a Hikvision NVR that can recognize on G711, G722.. etc. The recorded audio has clippings and noise. I figured out that it is because of this issue. I am thinking of using the 2 way audio input on the back of the NVR to feed in the audio...