Due to a miscommunication, a WCA Delegate allowed a competitor to use unplugged headphones for his first two Multi-BLD attempts instead of earplugs/earmuffs.
This violates Regulation 2i):
2i) While competing, competitors must not use electronics or audio equipment (e.g. cell phones, MP3 players, dictaphones, additional lighting) apart from the Stackmat timer or stopwatch.
In addition, Guideline 2ib+) explicitly clarifies that switched off devices are not allowed:
2ib+) CLARIFICATION This includes relevant devices which are switched off or disconnected.
Therefore the WRC decision is to change the affected attempts into DNF.