@blueranger
Are you SURE is sibilance? You haven't described the rest of your system.
There are a LOT of sources for annoying HF. Speaker breakup, a crossover component gone bad, a tweeter issue, a metal driver starting to flex.
Amp, preamp and phono stages can be sources of sibilance. Lot 'o things can push electronics in the wrong direction. Sometimes computers, their power supplies or switching power supplies can inject noise into the signal that can manifest themselves into HF noise.
You might have addressed the phono source side, but there are a lot of other components that could be contributing.
Are you SURE is sibilance? You haven't described the rest of your system.
There are a LOT of sources for annoying HF. Speaker breakup, a crossover component gone bad, a tweeter issue, a metal driver starting to flex.
Amp, preamp and phono stages can be sources of sibilance. Lot 'o things can push electronics in the wrong direction. Sometimes computers, their power supplies or switching power supplies can inject noise into the signal that can manifest themselves into HF noise.
You might have addressed the phono source side, but there are a lot of other components that could be contributing.