Rogue Audio Atlas Magnum III Power Amplifier

Your speakers have 3-ohm impedance in the midbass region.  

While they may sound god with the Atlas at moderate volume, the 3-ohm midbass region will tax the amp such that above moderate levels midbass will run out of steam.  

Can you stretch to the Stereo 100?  

@couger4u 

I owned the Rogue Cronus Magnum II for several years (Atlas amp section).  Then I upgraded to a Rogue pre and Stereo 100 amp.  

The Stereo 100 felt and sounded like twice the amp of the Atlas regardless of wattage spec.  

Sounded on par with my Parasound a21+ but better overall refinement, transparency and sound stage.  The ST100 is a world beater for the money.  

Answer- the S

I noticed minimal to no difference running the ST 100 in triode with my Harbeth speakers.  seems to be mirrored by other Stereo 100 users.  

Stick to ultralinear.