In my experience, negative sibilance is always induced by dirty AC of which we are all victims to one bad degree or antoher. Certainly, common grounding to the neutral buss does not help matters, but I'm not aware that the actual grounding is directly responsible for negative induced sibilance.
You can certainly experiment by floating the ground on all of your equipment (at the wall outlets), have a listen, then try connecting the ground to your cdp only. This should give the best bang for the buck. Yes, there is awlays the safety concern, but so long as one component is grounded, the others will be too from the interconnects.
As for the negative sibilance, since everybody potentially has that problem, most likely you had that problem prior to your recent installation by Verizon, but perhaps not as bad.
The only remedy I am aware of to eliminate negative sibilance (not embedded in the recording itself) is via proper line conditioning. And proper line conditioning implies bi-directional filtering because the digital noise induced by your cdp (or a dac) is bi-directional and it will contaminate your other components. Even if the others are on their own dedicated lines, digital noise is known to make its way back to the service panel.
-IMO
You can certainly experiment by floating the ground on all of your equipment (at the wall outlets), have a listen, then try connecting the ground to your cdp only. This should give the best bang for the buck. Yes, there is awlays the safety concern, but so long as one component is grounded, the others will be too from the interconnects.
As for the negative sibilance, since everybody potentially has that problem, most likely you had that problem prior to your recent installation by Verizon, but perhaps not as bad.
The only remedy I am aware of to eliminate negative sibilance (not embedded in the recording itself) is via proper line conditioning. And proper line conditioning implies bi-directional filtering because the digital noise induced by your cdp (or a dac) is bi-directional and it will contaminate your other components. Even if the others are on their own dedicated lines, digital noise is known to make its way back to the service panel.
-IMO