FiiO A5 Portable Headphone Amplifier | Black 🚚 Fast Shipping 📦 Brand New in Box, still factory sealed 🛒Click "Buy Now" Button to Place Order 😀 DELIVERY: Estimated 3-5 Authorized FiiO US Dealer. FiiO A5 Portable Headphone Amplifier | TitaniumProduct Overview. All of these factors signify that the A5 has a gain level close to that of the E12, but has improved channel balance, lower noise floor, and overall a purer sound. ✅STILL AVAILABLE ✅