Together with the 23 ventilation holes, BeoPlay H3 is tuned to deliver an unstrained open sound stage.

ENGADGET: B&O Play H3 and H6 bring Bang & Olufsen's newer badge to headphones

It's just that the 640i doesn't have the turbo-V8's brightness, its decadent bellow, its sense of unstrained overcapacity.

WSJ: 2012 BMW 640i Review: For the All-Business Person in a Hurry | Rumble Seat by Dan Neil