I assume by "ribbons" you refer to the EMITs and EMIMs (and their variant versions like SEMITs and EMIT-Ks)? Infinity had electrostatics in their earliest speakers, and then EMIT/EMIMs, but never true ribbons.
It think the "7ft long ribbon" you refer to might be the line arrays of EMITs and EMIMs on the big IRS Vs. Those "wooden planks" were about three feet wide and nearly eight feet tall, and were finished with rare Mahogany with a lustrous finish that has to be seen to be fully appreciated. Still, they were arrays of smaller drivers, and not single ribbons.
Good elucidation! :thumbsp:
There are some all-metal ribbons. The T1 ribbons on the Sequerra Signature series are just a very thin strip of pure metal. Someone here on AK substituted kitchen aluminum foil (considerably thicker) for the ribbon in one of these types of drivers, and reported that it worked fairly well!
To give credit where it is due (and not let an AKer appear to plagiarize! :nonothe above was originally printed on Jan. 2 1915 in The Saturday Evening Post, written byTheodore Francis MacManus, and reproduced more recently in a Cadillac advertisement (as linked to above). Relatively few people can or do write that well today; it's worth quoting as much for the quality of its prose, as for its content!
Oh, and just so these digressions aren't a total "thread-crap", I've heard JBLs that I didn't care for, and ones that I liked a great deal. Not all JBLs were created equal!
Any literate American would KNOW I did not write "The Penalty of Leadership" :nono:
I posted it to make my point, and position, on JBL.
Jim
