The more sensitive the speaker the more likely the noise floor will be higher, and the softer end of the dynamic scale will more likely to be negatively affected.
Yes, Unsound, your last post doesn't make alot of sense to me, either. High efficiency speakers, especially horns but also other types, are well known for very high quality at the very softest dynamics. This is one huge reason why so many professionals prefer them. I have never found noise floor to be higher in high efficiency speakers, quite the opposite in fact.
One of the fundamental advantages of high efficiency is it allows low level detail and microdynamic ebb and flow to be appreciated at low and modest listening levels. There is less need to"crank it up" in order for the sound to come "alive".
This is why the higher the efficieny becomes the need for a quiet well built amp with a very low noise floor is required. These types of speaker will reveal any noise, even at quite low sound levels. The advantage is uncovering more of music`s nuance and subtle -micro inflections.
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