A plaintiff, for example, is the person lodging a complaint. Doesn’t have to be a legal complaint, but in legal terms it makes it very clear who we’re talking about.
I think the OP was wondering why that person wouldn’t just be called a complaintlodger. Like with firefighter.
I have a pair of Bose Companion 2 Series III’s. I wanted a simple 2.0 set that looked unassuming and sounded good. I bought them refurbished for about half the price and it’s a great set if you have the same requirements as I did. The sound is good for a home office/gaming set in a small room. Clear, bassy where needed and way louder than you’d probably need.