I agree the VZN 80 is more than enough power with the VSM in most instances. The 100's may be preferable in a larger room but you don't give room dimensions. I had a VZN 80 in my 16X18/12X8 L shaped room with 10' ceilings, no problem at all. Dynamics may open up a bit more with the 100 monos but they will also introduce more heat output from 12 rather than 8 output tubes which is worth some consideration if living in a warm climate. These amps DO warm up a room.
The Joule is lovely with the Merlins, you couldn't want for more, especially with massed vocals and opera, the best I've heard the VSM for this type of music.
The Joule is lovely with the Merlins, you couldn't want for more, especially with massed vocals and opera, the best I've heard the VSM for this type of music.