The dimensions for the L-300 are 31 5/8"h x 23"w x 22 1/2"d. The weigh 145 pounds each. Here's a link to a brochure where I got the info:
http://www.lansingheritage.org/html/jbl/specs/home-speakers/1975-l300.htm
Also from that site you can get to the Lansing Heritage Forum which is a forum for talking about JBL speakers. You can get there by going to the home page and then clicking on the icon at the top of the page that looks like a page.
http://www.lansingheritage.org/html/jbl/specs/home-speakers/1975-l300.htm
Also from that site you can get to the Lansing Heritage Forum which is a forum for talking about JBL speakers. You can get there by going to the home page and then clicking on the icon at the top of the page that looks like a page.