View Larger Image Asus ESTX II with Burson V5i Opamp upgrade I am very pleased. Best ones in the market! A review on head-fi will shortly be up (I go by killerline there). Related By Sales Burson|2016-10-25T14:18:47+11:00October 25th, 2016|V5i SS Opamp|Comments Off on Asus ESTX II with Burson V5i Opamp upgrade Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInTumblrPinterestVkEmail