arthury wrote:
the Overton is most airy sounding and Mk is most muffled.
Goes to show how tone is difficult to put into words.
I'm a Low Whistle person, and at times I've had Low Ds from a half-dozen different makers, including Overton and MK.
I wouldn't describe their tone the way you have.
The various MK Low Ds I've owned have had a unique tone, which I describe as dirty/gravelly and Kaval-like. Certainly not muffled- though dirty the tone has a strong core.
Bernard Overton is credited with inventing the Low Whistle, and the Overton tone is a convenient benchmark to compare other makes of Low Whistles to. It's been described as a Cosmic Drainpipe.
About Low Cs, I had a Susato Low C with an angled neck that was a fantastic player, the nicest-playing Susato I've owned.
Currently I'm playing a Colin Goldie Low C that's superb. The tone is middle of the road, but the playability is great.
I had a great Ronaldo Reyburn Low C, metal body with wood head. Reyburns have a wonderful unique NAF-like sound. (The 2nd octave was a bit stiff for me.)