Pass Labs A/B amps vs Class A amp and Actual Power

Let's be clear. The XA.5 doubles its Class A power. The XA100.5 would provide 200 beautiful class A watts before going class AB. This is indicated in the specs on the Pass website. The older XA series kept the output fixed at lower impedences.

Rtn1, that is exactly what Pass told me today. All of the XA.5 amps will double their Class A output into 4 ohms.

Guys, any thoughts on the absolute minimum room width for Magnepan 20.1's?

Stickman51, I would suggest having at least mininumly a foot and a half off the side walls. You could always put the Ribbon tweeters on the inside to avoid sidewall distortion. The space between the 20.1's should at least be five to six feet apart between the inside edge of the speakers. My 20's were set up this way in my old place and they still sounded great, now I have them more then six feet off the side walls and about nine feet apart and they sound even better. Hope this helps.

Remember, you want at least four to six feet off the front wall behind the 20.1's so they can breath.

So, roughly, with 1.5 ft from each side wall and 5 ft spread, a minimum room would be 13ft wide since 20.1 is approx 2.5ft wide...

Adding another 1.5 ft on each side (total of 3ft) would make that minimum 16ft wide and one more foot spread between the speakers would be a 17ft room...

Rtn1, I was merely asking a question, and based upon Nelson Pass's (albeit different) previous Class A designs, the question was appropriate. The Pass web site does list the XA 100.5 as "Leaves Class A at pk Watts: 200". I'm assuming pk means peak. Does that mean sustained power or short term peak headroom power and into what impedance load? It doesn't appear to be all that clear to me.