The term 'BIG NAME IN AUDIO SYSTEMS' can be summarized by the crossword solution BOSE, which is a four-letter word. Bose Corporation is an American audio equipment company founded in 1964 by Dr. Amar G. Bose. It is known for its high-end home audio systems and speakers, noise-cancelling headphones, professional audio products, and automobile sound systems. Bose has become a household name in audio systems and is renowned for its superior sound quality.