I think the brightness is a facet of the larger omnidirectional driver. I hear no brightness in the 116F. I do in 101E and 101E Xtreme.
It's not extreme brightness, just a hint of metallic brightness caused by the driver material I think. Some sort of very mild resonance possibly? . . .
101E Xtreme is a fantastic speaker, though, all things considered. At a cost. I've heard it twice now for extended periods. It's up there. But if the slightly crystalline nature of the metal omni driver annoys, they aren't for you.
I do not know what caused the brightness I heard on the 101E Mk. II. I assume it was the tweeter. I kept wanting throw a wet ski mask over the tweeter. If Jurgen Reis would include a -1 dB and -2 dB tweeter attenuator on the back of the speaker (like many SOTA speaker designers do) I probably would buy it, and so would a lot of other people who also find it bright. (In my informal survey of 10 or so audiophiles the people who did not like the 101E Mk. II did not like it only because they, also, found it bright.)
I have been considering going to Berlin to hear the MBL X-Treme. But if my issue is treble energy from the tweeter I do not see how adding a second tweeter on each side will help. I would like to find the MBL X-Treme to be perfect. But no matter how great it may be in every other area, if the brightness causes me to stop listening, it just does not work for me.
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