Hello fisher fans! I’m proud to own an SA-300 amplifier. But I’m having sharp highs and I’m trying to adjust. Here is my setup. Fisher SA-300 amp, Pioneer sx-850 receiver acting as pre-amp and the only adjustment that seems to help is I have the treble set to -3. I like to listen to all styles of music. The speakers are Zenith 49cz852 in basic open baffles. This may be too general a question as there are many factors. But suggestions are appreciated. Maybe I need a nice fisher 400cx to alleviate this sharp brightness.