Yes, the speakers are efficient. Klipsch RF7 iii at 100db.There certainly is if your speakers aren't very efficient. Furthermore, for the price of the Enleum, you can get a great speaker amp and a great headphone amp. Separate amps will certainly have a larger footprint, but needn't weigh anywhere close to 40 kg in total. OTOH, if you have efficient speakers and love the particular sound of the Enleum, it may well be your preferred option.
Thanks for the input!