I had that fear after loving my Nexus6 dual speakers for so long, and it can still be nice at times _(mainly for volume level)_, but lately i've just been bluetooth'ing all my music from my Nexus6. The speakers just sound _(mildly!)_ crackly at loud levels, it makes me wonder if they were damaged from my loud playing. So, i guess i'm saying i don't really trust nice built-in speakers for playing music, and am willing to go back to a mono speaker knowing i can just use bluetooth instead.