Ok, so the question is whether or not the Krell Vanguard is superior to the 400xi. Well, yes in absolute terms and no if you are strapped for cash. Overall the Vanguard is clearer, more dynamic and slightly warmer. It also will not overheat and produces a more fleshed out soundstage. Bass has more texture and sounds natural as compared to the 400xi's taughter, leaner presentation. Both are great values and outperform the competition by a wide margin, IMO. FYI, Audiophileliquidaters have the Vanguard priced well below msrp!