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Pass Labs Xa60.8 Class A or should it be called class A/B?

I'm looking at possibly purchasing the Pass Labs Xa60.8, but am puzzled by one of its specifications.  One reviewer stated that "The XA60.8 doesn’t leave pure Class A until it reaches 122 peak watts. Then it moves into Class AB for unheard of headroom for a 60-watt amp".  I've confirmed this headroom is on the specification sheet, but if the amp actually can transition into A/B, shouldn't it really be called class A/B?  Also, I'm confused as to if this headroom is available as continuous watts or just peak.  Can anyone clarify?
dfairc777a
duramax747
194 posts
 
According to the man who designed it it's pure class A as is all the XA series amps. 

https://www.passlabs.com/products/xa60.8/
dfairc777a OP
60 posts
 
Yeah, I read that too and understand that it's pure class A, but what's this transition to AB thing?  Do all class A amps have a peak transition to AB point or is this unique to Pass?
arcticdeth's avatar
arcticdeth
1,572 posts
 
122W until leaves class A....
that is a class A amp of the highest order!

  I don’t think my brothers McCormack dna-750 monos even do any class A at all, they sound great all the time, and my Odyssey kismet amps are 10W of class A, they are very refined, and have a spectacular sound until the volume gets pretty loud, at a normal to average loud volume, the class A is great!!

 Wish I had a pair of class A amps, they are simply flawless!

 Class A is sublime!

  
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