Late to the party. Is there any wine left?
I dont believe your wife is hearing excessive upper mids/highs. I believe shes hearing distorted and smeared upper mids/highs. This important distinction points to different solutions. If Im correct, rolling off the highs wont help you need to clean them up, not reduce them.
When you upgrade a major source component (or two) to a more resolving one, the reduced noise and sound floors pass additional information. This additional complexity can test other components in ways they hadnt been tested before. I disagree with suggestions that you only changed the TT/arm, so the problem must be with them. That sounds appealingly straightforward, but its far from true IME. Rather, I think the increase in signal complexity has exposed shortcomings in other components.
You've listed a c-j MF-2500A as your amp. Are you still using that? If so, the new rig may have exposed its limits. I know this amp well because we used one for several years. Its a good mainstream product from a mainstream company, but it cant really cope with the full complexity from a top quality vinyl rig.
Fortunately, your Silverline speakers are easy to drive. You have no need for a high wattage SS amp. What you need is an amp that can maintain clarity when fed a complex mixture of closely related waveforms (e.g., vocal and instrumental harmonics).
When we compared our MF-2500A to our present amp (Doshi-modded Lectron JH-50) the difference was breathtaking. I could go on about the areas in which the Doshi is better (name anything, its better), but for this thread its just worth noting that it reproduces HFs and harmonics with jaw-dropping clarity and cleanliness. It approaches the purity of the best SET amps, but with enough push-pull power to drive all but very difficult speakers.
Consider trying out a top quality tube amp. Take advantage of your speakers being easy to drive. I think your wifes ears would enjoy that experiment.
I dont believe your wife is hearing excessive upper mids/highs. I believe shes hearing distorted and smeared upper mids/highs. This important distinction points to different solutions. If Im correct, rolling off the highs wont help you need to clean them up, not reduce them.
When you upgrade a major source component (or two) to a more resolving one, the reduced noise and sound floors pass additional information. This additional complexity can test other components in ways they hadnt been tested before. I disagree with suggestions that you only changed the TT/arm, so the problem must be with them. That sounds appealingly straightforward, but its far from true IME. Rather, I think the increase in signal complexity has exposed shortcomings in other components.
You've listed a c-j MF-2500A as your amp. Are you still using that? If so, the new rig may have exposed its limits. I know this amp well because we used one for several years. Its a good mainstream product from a mainstream company, but it cant really cope with the full complexity from a top quality vinyl rig.
Fortunately, your Silverline speakers are easy to drive. You have no need for a high wattage SS amp. What you need is an amp that can maintain clarity when fed a complex mixture of closely related waveforms (e.g., vocal and instrumental harmonics).
When we compared our MF-2500A to our present amp (Doshi-modded Lectron JH-50) the difference was breathtaking. I could go on about the areas in which the Doshi is better (name anything, its better), but for this thread its just worth noting that it reproduces HFs and harmonics with jaw-dropping clarity and cleanliness. It approaches the purity of the best SET amps, but with enough push-pull power to drive all but very difficult speakers.
Consider trying out a top quality tube amp. Take advantage of your speakers being easy to drive. I think your wifes ears would enjoy that experiment.