Your case is one of a line of particular cases where you have sufficient input sensitivity for the rated output power and sufficient high input impedance.
In many other cases preamp might be a necessary component.
Try out simple active preamp with low gain instead of your resistor such as McCormack or Wyred4Sound and you may realize the improvement since you will regulate output voltage rather than output impedance of your passive component.
In many other cases preamp might be a necessary component.
Try out simple active preamp with low gain instead of your resistor such as McCormack or Wyred4Sound and you may realize the improvement since you will regulate output voltage rather than output impedance of your passive component.