I have the B&W MM1s for nearly 11 years now - clearly one of the best investments I made for laptop duty on my desk. It won’t accept a sub, and neither do you need one. Just make sure they’re sitting securely on the desk - or the bass will suffer. It must be sitting stable, push the cables in underneath on both speakers.
The amazing thing is how they sound even 3 metres away. Just note because it has a built-in DAC and DSP you won’t get high res output - it will be downsampled. The built-in DAC is 16/44. Then again you don’t need high-res for desk duty.
Not available anymore, and B&W did not replace them sadly.