My shop stereo is a running gag in my family.
My house has two home theater setups, involving among other things, 2 15 inch subs, one 12 inch sub and enough other speakers to fill the bed of my F150, well, almost.
Pioneer and Sony Dolby systems on both the big TV's.
My 'computer speakers' are a Bose wave wrcc2 (really just because I didn't want the clutter of computer speakers and radio on my desk)
So how much did I invest in the shop, where I listen to loud music all day?
Nothing.
I had a leftover Sony receiver, 120 watt from the 80's. Pipe it into thirty free speakers, that is, speakers I pull from various projects, lots of Bose and other cheap car speakers that I replaced with more modern stuff. Built several long (eight foot) boxes that hold the leftover speakers and hung them from the ceiling.
In the house the music is so nice you can hear the third violin farting, but in the shop IT'S LOUD.
I play MP3's mostly over a cable from the shop computer, so I have ten or twenty thousand of my favorite songs cued up, so I don't get bored.
Although, some of my neighbors swear they can hear Flogging Molly in their sleep, I always turn it way down before sundown. And never play it loud before 9 am.