According to this FAQ:

Product compatibility

• Sub 4 is not compatible with Play:1, Play:3, Play:5 (Gen 2), Connect:Amp, SYMFONISK Bookshelf (Gen 1), or SYMFONISK Table lamp (Gen 1).
• All Sub products are not compatible with Move products, Roam products, ZP80, ZP90, Connect, or Connect:Amp (Gen 1).
   

Since the Port is not mentioned as being not compatible, I’d assume yes. 

This previous thread says you cannot.

Also another thread says the Port cannot be bonded with any other Sonos device.

Thanks for that!

Seems like Sonos may need to update that FAQ, then.

Hi ​@Airgetlam 

On it!