 Tinnitus problems works up in both ears

I've had intermittent tinnitus in my left ear for about 10 years now and lately my right ear has  been  showing  some  signs  as  well.  Knowing  this  I'm  pretty  careful  with  my  hearing.  I always  wear  those  foam  plugs  when  cutting  the  grass  and  use  musicans  earplugs  when playing  anything  above  very  low  bedroom  levels.  I  have  been  trying  out  different  amps  to see which ones I could use without my tinnitus working up, but I noticed that harsher, more square wave distortion sounds have been driving my ears crazy even at really low levels. Is it true that these will affect tinnitus regardless of volume level?