Analysis of information sources in references of the Wikipedia article "Limiar da dor" in Portuguese language version.
the threshold for pain is between 120 and 140 dB SPL.
The upper limit for a tolerable intensity of sound rises substantially with increasing habituation. Moreover, a variety of subjective effects are reported, such as discomfort, tickle, pressure, and pain, each at a slightly different level. As a simple engineering estimate it can be said that naive listeners reach a limit at about 125 dB SPL and experienced listeners at 135 to 140 dB.