The CHA1 is a classic quality headphone amplifier carefully developed by UNiKA and manufactured in the UNiKA factory in Taiwan. CHA1 is designed for headphone enthusiasts, audiophiles, multimedia and streaming users, or live concert sound recordists. CHA1 is suitable for consumer headphones and earpieces, as well as high-end reference-quality, low-sensitivity headphones. Impedances from 15 ohms to 600 ohms are easy to drive, producing a very smooth and dynamic sound. What's more, it has a very high signal-to-noise ratio and cannot be perceived by the power supply and characteristic circuit noise. From the test table at the end of this manual, we can see that the CHA1's frequency response is very flat from 20Hz to 80KHz, and the full-band frequency response error value is no greater than -0.15dB in the low-impedance to high-impedance test. From the test table at the end of this manual, we can see that the frequency response of the CHA is very flat from 20 Hz to 80 KHz, and the full-band frequency response error value is no greater than ± 0.2 dB in the low impedance to high impedance test. Especially using only an external 24V power supply and a classic OTL amplifier circuit design, its performance is incredible. The components selected by CHA1 are all high-level models, and a dual-connection stereo potentiometer with a different very low L/R output is specially customized to ensure listening consistency. The input jacks are a pair of NEUTRIK® Combijacks. They are available to connect balanced XLR and TRS jacks, or unbalanced TS jacks from recording or Hi-Fi equipment. The other two sets of input options are stereo RCA and mini TRS. It's convenient for users to choose sig