I guess people might be confused because a PSU spec alone can't tell you what power an amp will reach in practice, since that may depend on other factors as well (like cooling implementation, gain limiting or protection circuits).I am not sure why some of you are getting your panties in a bunch, it is a perfectly reasonable question, and I see no reason it has to be asked and was not posted by Wiim with other specs.
What are amperage and voltage TPA3255s operate at?
Why do I even have to ask this and get all sorts of silly responses?
However the actual output power of Amp Ultra was measured by EAC down to a 2 Ohm load. Perhaps that can help you assess if it is suitable to drive your speakers. Hope this helps!