The term 'SOUND PURCHASE' can be broken down into two crossword solutions: 'STEREO' (6 letters) and 'PURCHASE' (8 letters). STEREO is a type of sound system that uses two or more channels to create a fuller, more immersive sound experience. It is commonly used in home audio systems, car audio systems, and professional recording studios. PURCHASE is the act of buying something, usually with money. Sound PURCHASE, then, could refer to the acquisition of a STEREO system, either for personal use or for a business.