You don't want anything passively vibrating in response to music signals, whether that's musical instruments or unconnnected speakers. If other speakers have to be in the room, the simplest thing is just to put them face down on the floor or put them with the drive units face to face and off axis to the main speakers.
On the subject of a speaker being a microphone in reverse, lots of studios have Yamaha NS10 or similar woofers converted to act a kickdrum mics.