Michael ZissersonBy Michael Zisserson  
Author’s Reference AV System

…I have made the decision to own the Tempo, which means it’s dethroning my Parasound Halo A21+, which held fast in my system for almost 10 years (I owned the A21 previously). The audiophile amplifier game has changed and so have I, and I am not looking back, as the AGD Tempo is simply superior to what we thought were some of the best amps at this aspirational price range. 

https://futureaudiophile.com/agd-productions-tempo-gan-amplifier-reviewed/