I recently upgraded from Vantage to 13As. Have been running for years with an Adcom GFA 5802 and its mate the GFP 750. It has plenty of power (300w/c) to push the 13a's all day long and sounds pretty good. The problem is it is 20+ years old and I am itching for a new amp and pre. Just feel like the soundstage of the 13As is being held back by the old Nelson Pass design. So looking at the new Pass amps and want to make the right call. Leaning towards a set of monoblocks in the XA class. How much pure A amp do I need to really bring the 13A to life? I am in an area where there is no chance of auditioning anything before I buy it, so I would love to hear from anyone who has experience with this speaker and Pass amps.