A 1/4″ TRS cable is commonly used to relay the signal from one speaker to another, or from a mixer to another speaker. For example, if you want to “daisy-chain” the signal from Bose L1 Compact to another, or one Bose S1 Pro to another? You’ll need to add this 1/4″ TRS cable then!
Looking to connect a guitar or a keyboard with an unbalanced TS output? Rent a 1/4″ TS cable instead.