If you have a reason to do it there are two possible ways.
If the the Technics has a tape record output then that could connect directly to the Bose if it has an aux input. Use the Bose remote to control the volume.
The other option would be to connect a speaker to line level converter to the speaker outputs of the Technics. That will connect to the same aux input as option 1. With this option you could use either the Technics or Bose remotes to control volume but using the Bose will avoid overloading the input of the Bose if the Technics is turned up to high causing distortion.