8 ohm vs 16ohm sensitivity

"there is no 8 ohm version of 291..."

There actually are.

Both factory, and ones that have had diaphragms changes


The 16 is most common, but the 8 could be special ordered. After the switch to Ferrite motors they became much more common.

16 ohm frams were a holdover from tubes, but many dealers preferred them, they were harder to blow up for the rock "n' rollers...

Here's a link to a catalog page showing 291-8L which is a common later Ferrite mentioned...

http://www.lansingheritage.org/image...pro/page12.jpg