I have two that fit your description.
One setup at the cabin and one sitting on the shelf in the basement.
Tuner/amp, cd player, JBLs.
eBay for what your looking for.
Heck, you might even want to try craigslist.
“try craigslist”
Hell yeah. If you’re patient enough, you might find exactly what you’re looking for and a pair of real speakers too.
They sell single units like that at Walmart. I believe they carry the JBL system.