Hello there, I recently borrowed a 15w guitar amp from a friend (Behringer GM108). I use it with low, mid, high and master set on 10, and drive set on 2. I am wondering if I can damage the amp in any way by using it for bass guitar? I have heard stories of these small amps used by bassists get their speakers heavily damaged with time, that there is no other option but replacing the speaker. Is this true? Thanks in advance!