Simpl Acoustics Simpl A1 Headphone Amplifier for iPod A1HEADAMP
Must-have for high-quality headphones
I use my Simpl A1 with a pair of audiophile quality headphones and the improvement in sound quality they provide is obvious. Easy to keep charged. I wish it were smaller, but I appreciate that it attaches to the back of the iPod, unlike other headphone amps. Highly recommended if you've invested in high quality headphones and want to hear what they're truly capable of.