Hi all. I was just wondering what DIN stood for when looking at speaker specs. I usually see it in the Low Frequency Extension. They give a number say 14 Hz then have DIN in brackets. For example, I have Paradigm Studio 80s. The frequency response is 40 Hz to 22 kHz with a low frequency response of 27Hz (DIN). Can some one just clarify what that means? Thanks a lot.