Maybe someone else will - but I have no idea what you are asking.
Are you asking if you can improve the quality of the sound?
Please remember, P25 II is DIGITAL. There is no static with digital like analog. What happens when the signal is weak (or possibly too strong / RFI) is that it is garbled - digital error. That underwater sound.
So.... assuming that is what you are asking about, you have one of two problems and it is very probably signal related. If weak, you need an antenna. If too strong, (which is what it sounds like), read here about filters and/or read this