2. Nobsound NS-08E vacuum tube integrated amplifier mini audio hifi stereo headphone amp
- Nobsound can power high-performance headphones including the HD 580, HD 600, HD 650, K 701, K 702, Q 701, and otherы;
- it's one of the smallest headphone amplifiers, yet very powerful.
3. M-Audio Bass Traveler
- this amp is a battery-powered, and it can support up to 2 headphones at the same time;
- the battery lasts up to 8 hours;
- the amplifier is equipped with a bass booster, so you get the best listening experience.
4. FiiO A3 Portable headphone amplifier
- its design makes the sound quality far better than of some other amps of the kind;
- it is designed to suit headphones ranging from 16 to 150 ohms.
5. Pyle-Pro PHA40 4-Channel stereo headphone amplifier
- it has a power on LED indicator;
- has a 1/4 TRS Output jacks
- comes with a DC power supply of 12V/150mA.