BNplayer Help
Select SBN Filter
  To select best SBN Filter, open Preferences panel and select SBN Filter in the SBN Filter combo box. There are 5 SBN Filters. Each SBN Filter gives slightly different timbre. Default SBN Filter, named "DF14", is designed to keep your headphone's original timbre.
  Start with "DF14", try other SBN Filters and choose the best SBN Filter for your headphones.