Pass labs xa25 amp and BW 804 d3?

The Parasound Halo A21 is a good amp especially for the money. Highly recommended! 

The XA25 is a better amp though. Class A amps are rated according to their bias points, and in push-pull configuration, the class A envelope is double the bias. In this case, 50 watts. Beyond that you're into class AB operation. That's where the XA25, and push-pull class A amps in general, get their healthy headroom. 

Kosst said it perfectly. The pass is much better and more like 100wpc in A/B operation. 

I'm about 8 ft. from the speakers. Probably about 15 ft wide for the listening area. Although, the room is completely open behind my listening position. Approximately, 32 ft total in length from behind the speakers to the end of my kitchen, a total open floor plan.. I know pass is a better amp, that's why I am hoping for it to work. I don't listen to any classical, but I listen to everything else. I want to listen to classical though because I love music. I am CD only using a roksan k3, emotiva xsp 1 gen 2 pre and an emotiva xpa 2 gen 1 amp.  Emotiva is leftover from my more entry level system. It sufficed before getting 804s, except for the xsp 1 gen2 which replaced an emotiva USP 1. The xsp 1 is nice for $1200.it can replaced later. I need a solid amp. I am strictly 2 channel. $5000 is my absolute limit. I appreciate all the advice I can get. Still on the fence. Maybe the pass labs will work? Any other recommendations?
Thanks again

I'm using a First Watt F5 clone biased to 31 watts with a pair of Focal 936's (90dB sensitive). It in no way lacks the power to drive those speakers to any volume I please. The F5 and XA25 are similar, but there are important differences. The F5 is a 2 stage amp and the XA25 is a 3 stage amp. The XA25 has a meatier, higher voltage power supply, kinda like my build. It uses the exact same input JFETs as the F5. It uses current feedback instead of voltage feedback, like the F5. The real difference is in the massive output MOSFETs which don't use any kind of degenerative feedback, unlike the F5. That's an amp that will legitimately double it's power into half the impedance. The other notable difference is in the cascoded MOSFET gain stage that drives those massive output devices. If they're the ones I'm thinking of, they're kinda tough to drive with K170/J74 JFETs so the intermediate stage is required. The F5 is a very nice amp with a muscular, detailed, holographic sound. The XA25 is like the F5 built with a "cost is no obstacle" mentality. It does everything the F5 does, but better in every way.