As a side note, I think a lot of what type of sound you like comes from listening volume. The balance and detail of the Benchmark is great for anything south of 80db but as I push the volume it becomes hard/bright with a hint of midrange glare. Where the W4S is a little dull (less bass slam, highs dont snap) at low volume and comes to life at the 80db and up levels.
James, another good observation. Remember the Loud button on your 1990s mid-fi receiver? It was intended to to enhance low-volume listening by slightly boosting both the low and high ends of the spectrum. It's clear that the Benchmark excels on ~30 Hz extension as well as the very high end -- and its sonic signature may, in effect, be like a Loud button (relative to the rich-and-meaty mid excellence of the Wyred.)