TheHD 200 Pro Monitoring Headphones from Sennheiserare a closed, around-ear design that offer powerful and detailed sound for every monitoring task with an efficient ambient noise reduction. They can be used to focus on your mix at home, in your studio, or during live events, and more.

They have a frequency response of 20 Hz to 20 kHz and deliver accurate sound reproduction. The headphones are built with soft ear cushions for a superior fit and are comfortable to wear for extended hours. Their materials are chosen carefully. A single-sided 6.6' cable is included with a 1/8" mini-jack connector. In addition, a 1/4" stereo jack adapter is also included.

The silverA1 from FiiO is a portable headphone amplifierwith volume control, hi-fidelity output, and four EQ modes providing maximum flexibility. It can be used for smartphones, computers, tablets, iPods, and MP3 players to increase volume and deliver a more satisfying experience when listening to audio.

Featuring a sandblasted aluminum-alloy chassis, the portable amp uses a rechargeable lithium-ion polymer battery for power and weighs only 0.7 ounces. The four different EQ modes are switchable by briefly pressing the power button. A blue LED flashes to indicate each mode as it is selected.

Furthermore, there is a 3-color status LED to help you monitor the power condition of the unit, which flash differently for power on, charging, low battery, and full battery status. Finally, the tiny size of the A1 portable headphone amplifier makes this a great choice for adding that extra punch to your audio listening experience.