Sound Blaster X3 - Hi-Res 7.1 Discrete External USB DAC and Amp Sound Card with Super X-Fi for PC and Mac - Creative Labs (United States)
Sound BlasterX G6 7.1 HD Gaming DAC and External USB Sound Card with Xamp Headphone Amplifier for PS4, Xbox One, Nintendo Switch, and PC. - Creative Labs (United States)
AT-PHA100Portable Headphone Amplifier
Boost Volume and Sound Quality on Your PC - FxSound
GUSTARD DAC X16 MQA Decoder + H16 Headphone Amplifier full decoding ES9068 Bluetooth 5.0 DSD512 XU216 USB IIS X16| | - AliExpress
Connect Universal Corded Headset Amplifier
Amazon.com: beyerdynamic DT 990 PRO 250 ohm Studio Headphones (Ninja Black, Limited Edition) with 4-Channel Headphone Amplifier Bundle (2 Items) : Electronics
Boostaroo Headset Audio Amplifier (2x)
Amazon.com: Sound Blaster X1 Hi-res Super X-Fi External USB DAC and Headphone Amplifier for PC and Mac, Also Compatible with PS4, PS5, and Switch : Electronics
Syba USB 2.0 DAC 24bit 96KHz plus Stereo Headphone Amplifier - Walmart.com
BeHear ACCESS Hearing Amplification Headset Gains New Advanced Hearing Aid Features | audioXpress