recommended power tube amplifier for vivid kaya 45 speakers

I am listening to the Kaya 45s at the moment using Art Audio Opus 4s.  The thing to note is that I am in a small space and sit 7' to to 8.5' from the speakers and the wall is right behind me so it takes very little power to hit reference levels.  Can't deny bass sounds muddy compared to the AVM.  

I normally don't turn it up that much and at lower levels it is fine.  Higher levels, undeniably a bit muddy.  

If I wanted to maintain more of a tube sound, I would go with an AVM tube hybrid like the Ovation SA 8.3 or MA 8.3s.  The latter I have a pair of demos available.  

@atmasphere Thanks for the info, not doubt that it is a bad news :), i still didn't payed for those speakers, i promised to the deliver the money for the speakers at Monday. I loved their sound and the TAD micro revolution sound, but probably i will go for the vivid. I'm confused !
Which amp do you recommend for those speakers ?
Thanks a lot for trying to help and have a great weekend !!!

@daveyf  Thanks a lot i will think what do next, i loved the vivid so probably i will change my longing for CAT/Jadis/Octave ... :(
Thanks a lot 

I suggest the OP read my review of the Legacy Audio i.V4 Ultra Amplifier at Dagogo.com before purchasing tube amplification, especially for those speakers.   

@verdantaudio thanks man , i will take it to consideration...