I don't like the sound of my system. Help please.

Throwing more money at something you don't like is a bad idea,IMHO. Maybe you can get someone to help you with proper setup of the system and your listening space.

What interconnects and speaker wires used?

I would be suspect of the combo of the ARC amp, Vandersteens, and room acoustics/speaker setup with SS digital source could tend towards the lean side of things but hard to say without knowing more.

For starters your ARC gear should be left on all the time for best sound. It can sound hard and thin until fully warmed up which can take up to 3 days for ARC solid state and hybrid preamps.

I have found ARC and Vandersteen to be a good match. However, my experience is not with the latest Vandersteens.

You should be able to warm up the sound by adjusting the REL.

Call John at the Audio Connection.

Also make sure speakers are hooked up properly in phase, ie red/+ to red/+, black/- to black/-, etc.

Something out of phase somewhere might account for what you describe. Speaker connections are most likely and easy to check and fix.