Cube Audio Nenuphar Single Driver Speaker (10 inch) TQWT Enclosure

I am using a full PS Audio stack:

P15 Power Regen
DSD DAC Sr
BHK Pre

I used to have BHK250 amp buy sold that in favor of the SIT2.

Sorry I didn't compare the Aperion to any other brand.  I did compare their TOTL model the dual AMT to the lower aluminum ribbon model.  I think I could live with the aluminum ribbon model, they were very close.  With exception of the sensitivity so for maximum compatibility later on I went with the AMT, that and I thought it's a bit more airy.. but that could be the price bias taking.

@yorkshireman, 
At 10 watts I'm assuming that this is a SET amplifier utilizing a modest 6db of negative feedback (Many SETs are zero negative feedback). The damping factor is pretty modest as to suit the Nenuphars (Per design objective). I can not anticipate any problems with this amplifier. 
Charles 

@charles1dad 

Thanks for the quick and informed response, very much appreciated.

Yes it is a SET amp and as you pointed out slightly unusual with the -6dB, very small, and natural negative feedback, just for better bass.

@charles1dad 

Do you think an even lower watt amp would/might be even better? and do you have any suggestions?

@yorkshireman,
I can not say with any authority that a lower power amplifier would unequivocally be better, certainly as good. @david_ten is enjoying truly splendid results with his superb 2A3 SET . I feel more strongly that the absolute quality of the amplifier is priority number 1.

 The best quality SET you feel that you can afford. SET circuits are straightforward and no mystery. Key criteria are high quality parts, output transformers and very stout power supply. The Nenuphar will readily exploit these amplifier attributes.
Charles