If you're looking for an amazing headphone amplifier that offers a natural and brilliant sound, then you need the beyerdynamic A2 headphone amplifier! This incredible amplifier can operate up to two headphones at the same time, making it perfect for sharing your music with a friend. The beyerdynamic A2 also has a frequency response of 5 - 45,000 Hz and an impedance of 11.5 ohms, making it a great choice for audiophiles.