A few gigs ago I was setting up my rig and was ensuring all was well before the band sound check. There was strange distortion sound from my rig which was slighty annoying. I wasn't sure if it was my speakers, BF 210 or my amp, Ashdown RM500. I couldn't hear it with the band going so no problem for the gig. At home I tried to recreate the problem and found out the onlytime I could hear the distortion was when I had my hearing aids in as they can't handle the low frequencies! I now take them out when setting up my rig prior to putting my earplugs in for the sound check and gig.