Catalan folk/classical grouping which has a specific set of 11 instruments (in its most common standard version, anyway) and could be worth adding: https://en.wikipedia.org/wiki/Cobla

• One flabiol,+ tambor
• Four Catalan shawms
  • Two tibles
  • Two tenores
• Five brass instruments:
  • Two trumpets
  • One trombone – often a valve-trombone
• Two fiscorns