@wolfhound, what's your ride, what's your listening preference (r&b, house, jazz). I am assuming your priority is clarity over loudness, right?
@king1, what do you mean by hiss, sagitsit ra? or hait ra paminawon? or naay whine? kung hait or sagitsit ra, you may just adjust the tweeter level and slide the frequency of the tweets towards a lower number (depending on the functionality of your head unit).