My dunlavy scV sound harsh

No. Perhaps you need to replace your upstream components.

I've heard, but have no firsthand experience, that Dunlavys like tubes. I agree with Unsounds assessment, the Dunlavys are excellent speakers and I'm not sure the rest of the stuff is up to the task. Maybe you could borrow some other equipment to test the hypothesis. Good luck.

I agree with the above. The Dunlavys excell with high quality amplification and sources, but will pretty accurately reproduce what they are fed. One other possibility is your room--is it untreated with reflective surfaces at the first reflection points? That might have something to do with the sound as well. And how big is your room?

I agree with the above also. The Onkyo pre/pro is good stuff, but not in the same league as your Dunlavy SC-V. Although the Proceed will do, you'll also need a really good source that would be in the same league as your Dunlavy's.
Dunlavy's are used in some of the highest end mastering studios around the world for the reason that they will reveal everything and anything... I wish I had pair.