Mobile high-end for the pocket.

Fully balanced, fully discrete 4-channel high-fidelity headphone amplifier with output power of up to 4,100 mW (at 16Ω) or 2,600 mW (at 32Ω) per channel.

If you connect a high-quality high-res player to it, you can put together a small, fine system with Cayin's C9 headphone amplifier and the YD01 in-ear headphones, which offers unimagined sound possibilities.

• Optional vacuum tube or solid-state circuitry on the balanced and unbalanced inputs.
• The tube circuit is built with a pair of KORG Nutube vacuum tubes.
• Selectable gain modes: Pure Class A and Class AB.
• Dual input mode: Regular LINE input mode or PRE amp input mode (pure power amp mode).
• 3.5 mm SE and 4.4 mm BAL input and output sockets, the amplifier also converts BAL to SE and vice versa.
• 4-channel ALPS potentiometer with a pair of electronic stereo volume controls.
• Removable battery module with four user-replaceable Sony 18650 lithium-ion batteries.
• A high-quality protective cover is included as an accessory for the C9

The external C9 battery module accepts standard Sony 18650 batteries and is designed for operation with 18W Quick Charge 3.0 USB chargers. With charge indicator and overcharge and discharge protection circuit.

Can be used as a charger or as an additional power supply, the C9 battery module offers a stable, fast pulse response and a bipolar voltage with low internal resistance for the C9.