Okay. I took my Washburn dreadnought acoustic and strummed it with a pick for some chord progressions with a sound level meter about two feet away on the same level as the guitar to get maximum readings. The highest decibel level I could attain was 83 dB with just normal strumming, and this was directly in line with the front of the guitar. This level is about the same as a conversation with a friend; you are in no danger of adversely affecting your hearing. If you're still concerned, a good music store sells ear plugs that reduce all input by about 10 dB, thus eliminating any concerns you might have.