Hi Ben954 -
As you may know, the DNA-125 and 225 are based on the same circuit topology with the 225 delivering more power into a given load. Specifically, the differences in the 225 are 1) double the number of output devices (8 per channel instead of 4), 2) a much larger power transformer with over double the current delivery, 3) better power supply regulation, 4) improved parts complement, including Cardas connectors, Van den Hul output wire, and Vishay and Caddock resistors in critical circuit points. The DNA-225 delivers more power, greater transparency, and better resolution of low-level detail. However, as Eldarado points out, the DNA-125 and 225 share a strong family resemblance. The DNA-125 should do a fine job with your Totem Hawks, and I hope you enjoy it.
Best regards,
Steve McCormack
www.SMcAudio.com