Ray Samuels Audio Emmeline SR-71 portable headphone amplifier
The Emmeline SR-71 portable headphone amplifier ($395) is small but not light. Housed in an extruded-aluminum chassis with a bolt-on faceplate and a rear panel and battery cover that attaches with a thumb-screw, it measures 3.5" by 2.5" by 1.5" and weighs 11oz. That <I>sounds </I>light, especially compared to some of the headphone amps I've carted around in the past—not to mention their four–D-cell extended power supplies—but in the iPod era, it's the portable equivalent of a class-A power amp. So why would anybody be willing to lug it around?