@kr4 I wasn’t addressing brightness in the Ivan Fisher recordings, should have separated the two thoughts. My issue is with many modern day Bruckner digital recordings. There is emphasis on the brass (trumpets and trombones) due to over mic’ing or in the mix. The recordings are not balanced in a ff or fff passage. Adagios are usually well mixed.
I was not addressing brightness in the Fischer recordings of Mahler but giving this as an example of what I think is a well-balanced Bruckner recording.
The reason I mention Bruckner is due to the large scale orchestra close in size to Mahler. I’ve seen quite a few Bruckner performances where 5 trumpets and 5 trombones are used. That's a lot of microphones being used for recordings.
Why do you corelate the number of instruments with the the number of microphones?