Upgrading from ak4997 to the acclaimed gustard R26 and i dont have the WoW factor. After a few sessions and my best technical headphone lcdx, when I reach a fuller sound, better soundstage and better textures. 1600e vs 300 euros. Im Happy with this but there is a price to get 20,30 percent more? Now im looking for a new amp. Disminishing returns gets ugly. Excuse my english. Greetings