I use a Bose L1 Pro8 with my 8X. I don't play the 8X without the Bose. I have my internal 8X speakers OFF. There is a "Night & Day" difference in the quality of the sound/tone.
If you like the classic Hammond B3 sound, a "must have" is a Micro Vent 122, (connected in series between the 8X and the Bose) that duplicates the rotary sound of a Leslie 122. It is only the size of a pack of cigarettes, but has the sound of a 200 lb. Leslie. It has a pushbutton foot switch that controls rotor speeds of Fast, Slow and Off.