I am currently using a full set of Audio Alchemy including their mono blocks driving my Mag 1.7s. I switched to this setup after one of my Audio Research Classic 120s sparked out. I'm very happy with the resulting improved sound stage, clarity, etc. In full disclosure I am also using a REL sub and Audio Quest cabling as well as a Silver Circle A/C filter.
Check the Absolute Sound/Robert Harley article.
http://www.theabsolutesound.com/articles/audio-alchemy-ddp-1-preamplifierdacheadphone-amplifier-dpa-...
Check the Absolute Sound/Robert Harley article.
http://www.theabsolutesound.com/articles/audio-alchemy-ddp-1-preamplifierdacheadphone-amplifier-dpa-...