HeadAmp's classic USB DAC/Amp. Offers both the Portable Amp. and Upsampling USB DAC in one tiny box. Most popular model among the products of Headpamp this headphone amp gives you refined, soft and warm sound. You cant be so tired if you listen to music for long time. you can switch gain both high gain and low gain. With the solid earphone like Shure SE535, the of the metalic sound is away, and it gives reproduce the detail. With the earphone like Westone 4R, you can hear refined, well-balanced, warm sound. With the powerful bass earphone, the tone which is background is appeared and the sound of guitar solo and vocal become more powerful. With so many headphones, earphones, cables and headphone amps to choose from, it can help to know what to look for. Check out the website for reviews, comparisons, tips, specs and recommendations! The name of the website isBUYJAPAN HOT EARPHONE AND HEADPHONE CABLE REVIEW!!. Please check!!