What kind of computer and turntable do you have?
I have a desktop computer and my turntable is a Audio-Technica AT-LP60X-BK.
I think your best option would be a Sonos Five. It is Sonos’ best-sounding music speaker and it is equipped with a line-in port on the back so you can directly connect your computer or turntable. Since the Five only has one line-in port, you could add a switch like this so you can have both the computer and turntable connected at the same time.
And if you want to experience the best music-listening experience from Sonos, you can add another Five to form a stereo pair.
The only downside to the Five as a computer speaker is its size. It doesn’t have a small footprint like most computer speakers. And you also may experience a very slight audio delay when watching videos or playing video games on the computer.
If the audio delay is a problem, you could just use the Five with your turntable and get a Sonos Move for your computer and connect it over Bluetooth.