I am using Tara Labs RSC prime speaker cables bi-wired to my Tannoy D700’s and would ask if moving to Naim’s NACA5’s would tame sibilance Improve treble clarity or expect any impovement.
Most importantly better Pace Rhythm and Timing 
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I don’t know your current cables but NACA5 wouldn’t be my first choice to tame sibilance or to improve clarity. As @Igel points out its main attributes reside in PRaT. Generally though if you’ve got problems like sibilance it points to an equipment mis-match somewhere. This should really be what you address. Attempting to cure it with cables IME will never be wholly satisfactory, though it may ameliorate the issue.
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Agree with above. Cables can give some character and flavour but what you describe sounds like something more fundamental may be awry.
Borrowing another source or amp for a few days if you can might help clarify the situation?
I definitely wouldn’t buy NACA5 in the hope it will fix things without a bit more investigation.
Bruce
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I had Tannoy’s in the past and the dual concentric drivers are pretty directional. Changing toe-in can make a considerable difference. Maybe it is also worth checking what happens if you do not bi-wire them.
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How I go about these theoretical questions nowadays, that can’t be answered with a dealer demo, is I would buy some used NACA5 online which can be resold again for more or less the same money, and just try it for myself at home.
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As hinted at above, you need to consider the power amp in this. What is it, your profile does not show it.
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