Common mistakes in DIY acoustics
Just goes to show that acoustics ain't that simple, when even someone like DPA gets it wrong. This is littered with errors caused by trying to precis a complex topic.
By example, angling walls to avoid room modes is wrong. In fact it skews them and makes them harder to figure out. It doesn't make them any less.
But UNBELIEVABLY, they are quoting NC figures for background noise!!! This is derived from the human hearing response but microphones don't have ear canals..... So a decent NC figure can still have plenty of low frequency noise and guess what a sensitive mic does with that!!!