Review on Fosi Audio K1 Bluetooth 5.0 DAC Headphone Amplifier Mini Stereo DAC Amp & Preamplifier 🔊 - 24-Bit/192 KHz USB/Optical/Coaxial to RCA AUX Digital-to-Analog Audio Converter Adapter for Enhanced Home Audio System by Jesse Azuse

At first I wasn't sure about the DAC IC on the device as it is not the ESS or AKM ICs used in other devices. However, I was pleasantly surprised when I actually used this little guy. Source apps: Netflix phone for movies. Spotify Premium, Youtube Music on the highest settings. The line out was tested with the Schiit Vali2 and acted as a preamp. (Volume control and Bluetooth/USB/optical input can be used.) Coaxial test failed. Bluetooth: Windows laptop, iPhone SE (2016) (headphone out or line out) USB: Windows with disabled features (headphone out or line out) Optical TOSLINK: Phone -> Creative Soundblaster E5 -> K1 via cable (headphone out or line -Out). Output) Current Gear / Comparison: AMP: Vali2DAC/Amp OPP HA1 (ver1), creates a SoundBlaster E5 Plus Good detail and separation. I was able to hear new music sounds that I previously couldn't help but hear with my current gear. I really liked the pairing with the HE400i. No hissing/noise. Clear dialogues. I was able to confidently manage my HD650, HE400i (2016) and Talos version 1 (TRP50-MKIII modification). Also sounds great with KOSS ksc75. V Shaped Sound - Nice Bass Slam. and PC at the same time great convenience. I like the small package and the feel. Gaming experience cannot be tested - try PS4 or PS5 via USBCons: Device must be connected directly to laptop for audio to play. When connected to the Dell D3100 docking station, the laptop recognized the device and the settings could be changed, but there was no sound. The connection directly from the laptop worked. Initially I had problems with the device due to noise, but I returned it and bought it again and the new device was great. I used RCA to power my SONY AVR and the sound quality was great. I got this to make this AVR Bluetooth compatible and I'm happy with the results.