Cayin HA-1A Integrated Headphone Amplifier
Sam Tellig says it best: "The HA-1A may be the best thing that's ever happened to headphones... champagne sound for beer-budget bucks." More below...
"...If you've been driving a pair of quality headphones from the headphone jack of a preamp or integrated amp - or even if you already own a standalone headphone amp - the HA-1A may come as a revelation. How good can your present headphones sound? Probably very good indeed. So good that you might stop listening to your loudspeakers... The HA-1A breathes life and light into music in a way that transistors - and many tube amps - simply cannot. It makes musicians sound here, not there... The HA-1A has a way of making headphones sound less like cans (British slang for headphones) that is downright uncanny. And the HA-1A did bass - rich, full, tuneful, tight bass. I've always thought my Sennheiser HD 600s sounded a little thin and bass-shy. Such is not the case. The HA-1A may be the best thing that's ever happened to headphones... champagne sound for beer-budget bucks." - Sam Tellig, Stereophile
"Pardon me, but that grasp you might have heard was me catching my breath and gathering my wits after unpacking the Cayin HA-1A headphone amplifier. Actually, make that 'vacuum tube integrated headphone amplifier.' A jewel box of a beauty, the Cayin is for the dedicated headphone aficionado - the pleasure-seeking hobbyist who prizes Mount Blanc pens, Panerai wristwatches, or cases of Antinori Solaia 1997." - Neil Gader, The Absolute Sound