I remember about 3 years ago auditioning alot of speakers, I was shocked how bad they all sounded.. after about an hours listening ( after which I climatized to the poor sound !! ), I eventually bought a Sony speaker, it was about £200.
I usually Bluetooth, but I can connect a 3.5 m jack plug.
To be fair it works well, lasts a long time between charges.
We use it more if we are watching Netflix on the ipad, the sound is more like the TV at home.
I have a nice ish system built into the motorhome, I made the amp and it has mark audio drivers..
But the Sony thing does get used.