I have. Once I heard the XTR2K reproduce a lion's roar. It started with a low growl that actually was so realistic that it created a sense of actual fear. The growl erupted into a full blown roar that created the sense that your bloody flesh was about to be torn from the bone. It's amazing how those speakers can actually recreate the most delicate sounds and still be so dynamic with such fidelity. Now, this was accomplished with Mac's 2000 watt a channel amplifiers. Can you really release the full dynamics of the Big Mac speakers at a show? I suspect not which is why most don't fully appreciate the awe the speakers are capable of reproducing.