How many systems do you have?

Two: One in family room which blends into the kitchen (main listening area), and another in my office.  Won't count Alexa in the bathroom... 😆

I've got two separate systems - one for headphones and one for 2-channel....

Three, plus several bookshelf speakers on the side. Like many others here, I listen to the smallest one the most, and outside.

4

Main; Office; Garage/Shop; small Home Theater

all overhauled past 2 years.

shown here

 

Our house came with whole house stereo consisting of four amps and 28 speakers. It’s a system and sounds as one might expect. Do the bathrooms have sound? Check. 
 
I plead the fifth about the rest.