So i had this old valvestate cab i was using for bass because i wasnt aware at the time that you aren't supposed to put bass through guitar speakers..

Anyway after doing this and playing guitar with it again the speaker sounded amazing. Very smooth and not harsh at all. If i were to do this for a new speaker (because i dont have the means to crank amps in the studio) would this damage the speaker potentially? I watched a video of a cab company breaking in speakers and it was a case of vibrating it at low frequencies for 24 hours.