Hi Yossi,

It's not a bug - the position of the acoustic lens can be either narrow or wide during the measurement.

Hi MarioA,

Generally speaking, the Room Compensation filter does not extend to the frequency range covered by the tweeters; nor should it, since at higher and higher frequencies, the room's response is increasingly non-linear (on a long-term time scale). For example, small changes in the room (like someone walking in) create large changes in the response, small changes in measurement and listening position cause large changes in response, and we increasingly rely on the direct sound to determine timbre at high frequencies - so the room plays an increasingly smaller role.

Put this together and you can say that, as you go up in frequency, the room plays less and less of a role in the filter applied to the audio signal from the loudspeakers at the listening position, and you'll get more and more of an error in your measurement as a prediction of "how it sounds". Diminishing returns...

 

Finally, just to be clear - everything I've said in this thread is focused on the original question and heading. I've only been talking about Beolab 50/90.

All very interesting, thank you again!