+1 richpinto
Of course this is all personal preference, but I agree that these speakers allow you to really expand the front-ends and continue to hear the improvements provided. What's impressed me is that I've made rather significant upgrades over the last 2-3 years, and the speakers keep revealing the improvements without feeling like they are a weak point that is holding the whole system back.
I have several pretty significant headphone rigs to run in parallel to these speakers, using the same front-ends and sometimes the same pre-amp, and I'm impressed at how tonally and emotionally similar these speakers are in comparison to the high-end headphones sets I have. I hear the same improvements through the speakers that I do through the high-end headphone rigs--that says something to me.
This is also a totally personal preference, but in my experience, if you can get a significantly good, dynamic, and clean 300b amp (or monos) in front of these level Zu speakers, it's truly something you'll be emotionally engaged in and have a hard time beating if you like the dynamic-yet-not-fatiguing and super emotionally engaging sound. Add a well-matched pre-amp, and I suspect you will walk out of the majority of high-end show rooms with systems costing 3x what you have in yours, and not feel like you'd trade straight-up for them. In many cases you won't even like the hi-fi sound coming from them that will be SUPER evident to you after you've had a properly matched Zu kit.
I'm not a Zu fanboy. I have had Zu speakers sound like total crap, btw, so I'm merely reiterating previous points that the higher-end speakers in their line can be amazing when properly matched.
