Now this is an unconventional review. I stepped right in and started discussing the NA1’s weakness first. Because apart from that, I am thoroughly impressed. The speed of the single dynamic driver is simply delicious. The tightness of the bass can make any drummer drool and the body feels just right with most recordings. The midrange is accurate and once one gets past the slight hollowness, voices sound realistic too. The treble is snappy and fast in decay. It actually all comes together when you have a perfect seal and no surrounding that would drown out the lows. Under these conditions, the NA1 is formidable. But when I step outside, I personally either need better isolation or less treble emphasis.