Odyssey Khartago ES or PS Audio Stellar S300?

Go with the Odysseys.
you can get kismet innards in the khartago. Klaus will do whatever you want.

We suggest going full boat on khartago amps(s)
get the largest caps, and all the goodies if they fit.
You will be rewarded.
Just see what odyssey can fit in the khartago amps.
i h ears he can put the kismet in the khartago.
worst is the break in time,......I only shut down and unplug during storms, vacations, when not listening, oh hell,....they are powered on 24/48 hrs before a listening jam night.



Only issue is bias. Should have an outside knob to bias easily. Instead of the volt meter etc 

Odyssey.  I prefer the class a/b.  The odyssey will be more reliable.  The odyssey will be more musical in my opinion.  Thats what class d has always lacked for me.  The ps audio will have great bass, perhaps a bit dry and blah.  The odyssey should have more texture in the bass area.  The ps audio will have a very black background and good separation on the soundstage but the odyssey will have a bigger, fuller soundstage.  This has been my experience with similar amps as the two you mention.

I’d go with Odyssey for many reasons...

Heard the bias only needs to be done every 10 years?

   

The Odyssey will be more engaging and have better texture in the mids/highs (like has already been mentioned).  Be aware that Odyssey has a completely manual turn-on switch (no remote trigger turn-on input).  This is really just a convenience item, unless it bothers you.   Another thing to know is that Klaus likes to use really small 400VA transformers (even if they are stacked).  This means that Odyssey will not have the deep bass muscle/fullness that other amps may have due to transformer size.  Even though Klaus can load 120,000uf, the ultimate power of the amp itself is still really driven by the size of the transformer.  This doesn't mean that Odyssey isn't an excellent amp (it's really very good).  The PS Audio -may- have better low/deep bass due to Class D operation, but it only pushes 140 watts into 8 ohms, so it is not a power beast either. 

I have heard the PS Audio S300 amps and they are quite good for a Class D amp.  They aren't really "flat" sounding like other amps.  Their Class A input stage is really nice.  But I still think the Odyssey will be a better sounding result in the long run.

Odyssey uses I think 850’s now.
850va transformers. Not the 400.
I think it’s an option for the 850,.....
don’t quote me, one needs to call klaus for this.