I mentioned Jay’s transport and Hegel integrated. I don’t think speakers are contributing to the problem but they are Silverline SR17.5 monitors. I've tried various scenarios, including slaving the Aqua to the Hegel's clock, which made matters worse. The one consistent result was that sibilance was worse with the Aqua in the signal chain.
Yes-- I should’ve mentioned that’s the only thing that’s occured to me, so far, to try.