As far as I can remember, the frequency of an open B string is 31.5 Hz and of open E string it is 40 Hz. A good 212 cabinet may have e.g. 53 Hz (-3 dB) low frequency response, and a 410 cab could have 36 Hz (-3dB). I assume that beyond that point the response curve at low frequencies could be quite steep. How it comes that people play B or E and the low tone is still pleasantly audible? Could anybody give me a simple practical explanation?