The Enleum AMP-23R is a speaker and headphone amplifier with quite a unique design.
The video above is my subjective review of the 23R, if you’d like to see full measurements they are posted here: https://goldensound.audio/2022/07/12/enleum-amp-23r-measurements/
Product Page: https://headphones.com/products/enleum-amp-23r-desktop-headphone-speaker-amplifier