How low do Decade L36's go

[shacky]

I know JBL didn't like freq response specs. Just put my L36's back in rotation. Had been listening to AR 2AX which I think dip into the 30's in useable bass. The L36 are no slouch either. Wondering how low they go with ported design.

Has anyone measured?

[JBL 4645]

I haven’t been able to find much on the specifications on Google image, however I only found this about the JBL L36.

http://www.lansingheritage.org/images/jbl/specs/home-speakers/1974-decade/page8.jpg