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.
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.