I tested the lcd 4 in the past on the same gear for many days and even though i loved its slam i kept the hd 800 in the end because of its transparency,details and soundstage. The only thing that comes close to the ERA on LCD 4 is the slam, the rest is just more musical, lively, transparent and more detailed on the Quads, lcd 4 just sounds dark and warm and frankly boring compared to it. ERA is like having a much better hd 800 for me, with even better detail retrival and with fantastic lower frequencies (details that come with the right energy, for example it handles chords dynamics extremely well) , a smaller soundstage but much more precise with more height to the room, a much more intimate sound that doesnt put you in the back row in a great hall like the hd 800 but right there on the stage, enveloping you in just great music in a non fatiguing way, just making you enjoy the music simple as that.