If you really want to experience what excessive headroom is like at high volume levels, a pair of White Oak Model One's in Mono config is an awesome way to go!!
The Model One takes the Phase Linear sound to a higher level with bass impact and details like no other I've experienced at this price point.
Sorry for the crappy picture, but this is what I've been sitting in front of for the past several hours...
The sound is so clean and detailed, you can't help but turn the volume up and feel the music!
My Benchmark AHB2's do not play this loud, they are very clean and detailed but not like this.