For their 25th Anniversary, Feliks Audio sought to take the well-renowned Envy tube amplifier to the next level of performance....and succeeded. Pre-Order the Envy 25th Anniversary Edition here: https://headphones.com/products/feliks-audio-envy-25th-anniversary-edition Read more headphone, IEM, amp, and DAC Reviews: https://Headphones.com/TheAudioFiles Glossary of Audio Design and Measurement Terms: https://headphones.com/blogs/features/the-glossary-of-audio-measurements-and-terms Our Editorial Policy: https://Headphones.com/TheAudioFiles/About Join our Discord server: https://go.headphones.com/discord Measurement Index https://forum.headphones.com/t/index-collection-of-measurements-made-by-resolve/15251 Resolve's Headphone Ranking: https://headphones.com/blogs/buying-guides/resolve-headphone-wall-of-fame How to read the new measurements: https://www.youtube.com/watch?v=QWS-hIzI1KU The 10 stages of headphone measurements https://www.youtube.com/watch?v=LrIoNMeo_GI