I really think that all this discussion about arms needs to be related to the cartridge/cartridges that are to be used with these arms.
Not every tonearm is correct for every cartridge.
To discuss arms without cartridges in mind is quite "out of context" in my opinion.
Regarding the cartridge originally mentioned in the thread topic, I wouln't recommend the use of something like a Koetsu, DL103R, or Shelter in most unipivot arms(although there are a few exceptions), especially any light weight unipivot arms.
All unipivot arms are pushed to their limits of stability with low compliance cartridges, and even the actions of the tonearm designers themselves, such as Graham, and Weisfield, and others, have incorporated "outriggers" or other types of stabilizers to help their unipivot arms deal with the lower compliance cartridges.
Matching is critical, and proper matching goes beyond simple mass/resonance calcs.
Not every tonearm is correct for every cartridge.
To discuss arms without cartridges in mind is quite "out of context" in my opinion.
Regarding the cartridge originally mentioned in the thread topic, I wouln't recommend the use of something like a Koetsu, DL103R, or Shelter in most unipivot arms(although there are a few exceptions), especially any light weight unipivot arms.
All unipivot arms are pushed to their limits of stability with low compliance cartridges, and even the actions of the tonearm designers themselves, such as Graham, and Weisfield, and others, have incorporated "outriggers" or other types of stabilizers to help their unipivot arms deal with the lower compliance cartridges.
Matching is critical, and proper matching goes beyond simple mass/resonance calcs.