A Berning EA-230. I had one of these before I changed to my less efficient Amphion speakers. I sold it for almost $200 more than I paid for this one. I have the Manley Stingray, which I do like, with my Zu's but since the Amarra 4 is a preamp, I really do not need an integrated. This will save me about as much as the fine was if I decide to sell the Stingray.