Just to add, I'm familiar estimating the power requirements , for a particular speaker sensitivity,listening distance,speaker placement etc from online calculators.
[For eg, I get 0.7W power requirement for reference level(85db) listening and 64w for 20db peak(105db). This is for an 8 ohm nominal impedence and double this (1.4W at avg spl, 128W at peak spl ) when it dips into 4 ohms ].
But my earlier question is a generic one, as I want to try to buy an amp , that'll last a long time , possibly across different speakers , including those whose nominal impedences are rated 4 Ohms(like many of the MartinLogans are). Lets say I stick to speakers with ~90db senstivities.
Any ideas on my previous question on the ceiling of "Recommended amplifier power"?