Now 20 months later, after many upgrade itches (that went away because I couldn't afford to scratch them).........
First thing. About a year ago I bought some Z banana plugs for the speaker ends of the NACA5 (which were bare wire screwed to the speaker binding posts). I seem to remember cutting off the Deltron bananas because the NACA5 was pulling them out of the sockets. Surprise, surprise. The treble increased. Not like that of the Tukans, but in a pleasant balanced way. I did not imagine there would be such a difference between bare wire and Z plugs. Guess there wasn't so much contact area with the few strands of NACA5 compared to soldered Zs.
Then just recently I decided to replace the NACA5 because it snapped one of the Z plugs on the back of the amp when I moved it. Just had enough of its unfriendly nature. Think it would be better to use it for rodding blocked drains!
Bought some nice cheap Van Damme UP-LCOFC Hi Fi 4mm/2. Subjectively seems to have more base, clarity and balance than NACA5. And this is without putting any hours on it.
Regarding amp power, the B100 is rated at 60W into 8 ohm and 120W into 4 ohm. The Sonus Faber Concertos are 6 ohm so I am guessing at this impedance, the output will be around 90W.
Anyway, all sounds very nice.......till the next upgrade itch.