Standalone headphone amplifiers really can make a difference to the sound of your cans. All the units tested here give a better sonic result than you'd get just plugging them into a headphone socket on your typical integrated amplifier, mini system or iDevice. Indeed, with the latter the differences were profound - you may be surprised how good your portable player can be via decent headphones driven properly. But there were still very obvious differences in sound between these five, especially considering the relatively small price differentials -not just in tonal balance but also in the way the rhythm and dynamics of the music were conveyed. It's true to say that a good headphone amp can transform a pair of middling 'phones, but not the other way round...
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