In my own experience with Gryphon Antileon amp (100 watt pure Class A), to Lightminers point, I have found the Dominus Ferox to make a big difference. I have spoken with other A'Goners off-line who also concurred that upgrading the stock PC on Gryphon amps (Class A ones...Colosseum) yielded significant improvements. I am auditioning a Purist Audio Aqueous now (which is def better than stock) and am likely to go for Dom Ferox. I have a s/hand one for my DAC and the improvement is worth it for me. Hope that helps.
