Original owner. I use this CMA600i as a headphone amplifier. It a beautiful piece of gear and it sounds great. This amp has a lot input output options like analog RCA XLR inputs, single end and XLR headphone outputs, RCA preamp output. Digital inputs include USB toslink and AES. I don’t use its build-in DAC but please be aware that because of the CMA600i’s firmware support issue, its USB DAC input has compatibility issue with certain MACOS, Linux OS and Windows 11. So if you want to use the build-in DAC and only can use USB to connect to it, please look elsewhere.

QUESTYLE CMA600i DAC with HEADPHONE AMP - FREE SHIPPING We are pleased to offer this Questyle CMA600i DAC with Headphone AMP. It is in good pre-owned condition showing light cosmetic wear. It is in perfect working order.   Specs:   Product Type: Headphone Amplifier with DAC and Pre-Amp Chassis: Silver/Space Grey Chassis Materials: Special CNC tooled aluminum Dimensions: 12.99” W x 11.81” D x 1.38” H Weight: 113oz Working Status: Patented Current Mode Pure Class A Voltage: 100-120V or 220-230V, switchable Power consumption: 18W   Headphone Amplification Section:   Gain: 13.4dB (4.7 times) Max Output: 220mW@300 Ohms, 950mW@32 Ohms (Single Ended) 630mW@300 Ohms, 1900mW@32 Ohms (Balanced) THD+N: 0.00057%@1kHz, Po=100mW, 300 Ohms 0.00034%@1kHz, Po=50mW, 32 Ohms SNR: 113dB Frequency Response: DC-100kHz (+0, -0.7dB) ; DC-600kHz (0, -3dB) Sensitivity: 1.7Vrms Input: Internal Dac Output external RCA, switchable Output: Dual ¼” (6.35mm), 1 x 4 pin Balanced output   DAC and Pre-amp section:   Supporting Files: SPDIF and Optical: PCM 44.1k-192k/16-24 bit USB: PCM44.1k – 384k/16-32 bit, True DSD64-256, DoP 64-128 Supporting OS: WIN XP, Vista, Win 7, Win 8, Win 10, MAC OS Digital Input: SPDIF, Optical, USB Type B Kernel Streaming: WASAPI, ASIO, KS Digital Filter: PCM mode, IIR (MP) and FIR (LP) Switchable; DSD mode; no filter Output: XLR and RCA Max Amplitude: XLR: 8.6Vrms; RCA: 4.3Vrms Analog output: THD+N: RCA<0.00082%, XLR 105dB, XLR > 121dB Listing and template services provided by inkFrog