Mono Blocks on a Budget, is it possible?


I’m really struggling with the direction to take my system. I have the following:

Legacy Classics speakers
Aurender N100H media player
Schiit Freya tube pre-amp
Schiit Yggdrasil DAC
Schiit Vidar x2 (in mono block mode)

I will be replacing speakers at some point but the rest of the system I love... except the Vidars. Before them, I had NAD 356BEE that was used for the amp. Very clean and I loved it, except it was only 80 Watts. I decided to upgrade to the Vidars. They cost twice as much From a good manufacturer like Schiit so they must be better right? Not really. They are more noisy than the NAD amp and I’m finding myself less in love with them that I though I would be. I was planning the Vidar purchase for about a year and now that I got them I don’t know which direction to take in replacing them. I want to get cleaner mono amps but don’t want to spend more than $3k MAX for both. The Vidars are 400 Watts into 8ohm, are there any options out there for me that are close to the Vidar specs? I’m open to used but mostly I want the amps to sound almost completely clean with practically no distortion. 
xerotrace
Ummm.  He has two stereo amplifiers with 4 separate and independent channels, obviously you suck at reading comprehension.

his speakers are considered sensitive and don’t require the added power balanced offers...that’s one reason he could be disappointed in the humming.
dubulup"Ummm.  He has two stereo amplifiers with 4 separate and independent channels, obviously you suck at reading comprehension."

Ummmm ahhhh geee ummmmmmm well you don't understand audio you freakin' moron because to properly biamplify a Music Reproduction System you will need a crossover to achieve that and get the four independent channels of amplification that you seem to think that he has but doesn't so ummm geee uhhhhh you can figure that out now ummmmm ughhhhh ummmm
passive crossover will work in this case...active is better if you don’t have a budget

I just asked a question bud, you jumped on me...enjoy life

I also had (have) a 356BEE, and replaced it with one Vidar and Freya +.  I'm selling the NAD.  In my case, I had no noise from the Vidars coming through the speakers, but a very slight hum when I put my ear within an inch or two of the amp.  I swapped the NAD and Freya/Vidar back and forth a few times on various tracks guided by notes taken while listening to the NAD - drum at x timestamp, cymbals at another timestamp, etc., and the Vidar made enough difference to earn its keep. 

Imaging was also much better with the Vidar, with sounds seeming to emanate from above the speaker at times, not from the speaker.  That really got my attention.  I wondered if the preamp was the difference so I powered the Vidar from NAD pre out and difference was same.  I replaced NAD with a B&K preamp and no change.  Freya tubes also took some of the 'ice pick' sharpness out of higher treble which was definitely appreciated. 

I cannot explain any of this.  All I know is that I spent a week going back and forth scribbling annotations to my track notes and I could not blame perceived difference on panacea.  I did not want the Schiit product so much as wanting to see what could better the NAD.  I was prepared to buy a used NAD C375BEE and save a few hundred dollars, but what I heard from the 356 told me I'd get more watts and not much else with the 375.

Speakers are Focal Aria 926, known to be a bit bright.  Freya smoothed that out, but bass control was in a different league, and that's the Vidar's doing.