Class A 30 Watt Amps: Are they enough to drive my book shelfs?

BTW- thanks for the previous thoughtful responses on this.  

For those folks with experience listening to 30watt class A amps, how would the Pass Labs XA 30.5 compare sonically to the pass labs 150.5 A/B amp?  Other than more power & better bass control (with the 150.5) is there a unique listening experience (with pure class A) worth chasing?

The class of speaker is independent of the brand. 

Hence, ‘headroom’.  

Last question : This is for a 10x14 bedroom in AZ.  Will the amp run so hot that it generally becomes impractical for this space? 

Does anyone have any idea of how this amp might sound at medium volume levels in comparison to a Modwright KWA 150? ( which I currently own ) I would assume a finer grain and less texture?

Unfortunately, I have never heard a Pass amp.