Cayin C9 Headphone Amplifier

The Cayin C9 is a high-frequency 4-channel headphone amplifier, featuring full symmetry and discretion. It delivers up to 4100mW (at 16Ω) or 2600mW (at 32Ω) per channel. Choose between vacuum tube and solid wood construction on symmetric single-ended inputs. The circuit uses a pair of KORG Nutube vacuum tubes, offering both pure class A and class AB gain modes. It supports 3.5mm SE and 4.4mm BAL input/output formats, optimizing them as needed. The C9 comes with a removable battery module powered by 4 user-replaceable Sony 18650 lithium batteries.