The Merlin VSMs are more far more efficient than most people realize.
Compared to my 96 db sensitive Horning Perikles backloaded horns using Lowther DX-2 drivers, you definitely have to go up a click or two on the volume dial, but it's surprising how close things are in that regard.
Two moderately powered tube amps I drive mine with, a push pull 6AS7G integrated and a Dynaco ST70, provide more than enough power.
Compared to my 96 db sensitive Horning Perikles backloaded horns using Lowther DX-2 drivers, you definitely have to go up a click or two on the volume dial, but it's surprising how close things are in that regard.
Two moderately powered tube amps I drive mine with, a push pull 6AS7G integrated and a Dynaco ST70, provide more than enough power.