The Enzo series uses Customized Driver Design, which is capable of delivering a rich audio spectrum (copied from advertisement ). Seriously, for my testing, I did not encounter any real distortion, just may be a tiny bit at the max.

And for me, I feel the Enzo series produces more detailed sound then normal design speakers (in terms of their customized driver). I suggest you can try out by listening to the same song on some normal speakers and then listening to the Enzo speaker. I think this is because the Enzo speakers can support a "rich audio spectrum". 

Enzo 500 now retailing for RM149 at Plaza Low Yat, with free SonicGear HS405 Headset, 'Mo Siang' online game cd and 100,000 Mo Siang in-game gold - promotion period only, while stock last.