You are correct that 417 has the 416 assembly

If you want to get some insight set up a box design in say Winisd


Then:


Sd - Projected area of the driver diaphragm, in square metres.
Mms - Mass of the diaphragm/coil, including acoustic load, in kilograms. Mass of the diaphragm/coil alone is known as Mmd
Cms - Compliance of the driver's suspension, in metres per newton (the reciprocal of its 'stiffness').
Rms - The mechanical resistance of a driver's suspension (i.e., 'lossiness') in N?s/m
Le - Voice coil inductance measured in millihenries (mH) (Frequency dependent, usually measured at 1 kHz).
Re - DC resistance of the voice coil, measured in ohms.
Bl - The product of magnet field strength in the voice coil gap and the length of wire in the magnetic field, in tesla-metres (T?m).


Play with Mms and Bl and view the resulting responses

I would like to see what a 417 assembly could do with a higher mass kit, like a 3154. There may be issues with gap length. One of the 3 million things I likely will never get done.