Soldano SLO 30 Fizz

Hey everyone

Soldano SLO 30 with Soldano 1x12 cab (celestiom vintage 30 16ohm) overdrive channel sounds totally fine with any amount of drive and boost when I seat down on the floor directly in front of the cab, when I seat down on chair in front of the amp, basically I’m hearing the signal from almost 45 degrees angle sound so fizzy!!! Even when I stand in front of the amp the same fizz!!! So it’s not the amp!!! It’s the positioning issue, any idea how to solve this problem, also no matter you play with gain and eq and everything else the fizz still there from the angle

Thanks