The CODA #16 is really an excellent amp. One of the very best amps I have ever heard. It reminded me of my Benchmark AHB2 on the top end, so clean and smooth. I did not spend much time with the #16, though I knew immediately that I preferred it to the #8 that I owned.
The dealer that I am working with for the KEF Blade feels that the CODA is a bit warmer than the KRELL XD amps. I disagree with him on that. The KRELL XD amp is not an amp that I am normally attracted too sonically. However, after owning the K-300i for a year and now the KRELL 175XD (up for sale) I realized that I ALWAYS have a great time listening to music on these amps.
The sound is very smooth, with enough details, and a bit rounder on top. I also think the bass is very strong. The pairing with the new KEF speakers is something that I have done for a year, with LS50 Meta. So I know that is a great pairing. My dealer also says that is how he prefers the Blades paired. So that is why I am going with the KRELL over the CODA.
My office system has Benchmark AHB2 monos and the CODA #16 is also on the neutral side, so the KRELL is a change of pace from that sonic signature. Another reason for getting the KRELL XD for the Livingroom system.