What is :DIN i.e.Low-Frequency Extension 43 Hz

I have seen some speakers rated i.e:

Low-Frequency Extension* 43 Hz (DIN)

What does DIN stand for?

Thanks

bokfudo02-19-2010 11:59pm

kijanki Details Discussions Posts This discussion Message User 4,445 posts 02-20-2010 at 05:19am Copy Comment URL Report Comment Edit Delete Deutsches Institut für Normung (German Institute for Standardization) Audio is covered by DIN 45500.