Originally Posted by
Giskard
"What really is a 2122H ?" ( asked by Earl K )
It's an "improved" 2121/2121H as used in the venerable 4343/4343B. Think LE10H without aquaplas. The 2121 was essentially an LE10A without aquaplas, same inverted dome. No mass rings.
Different coil, 52 turns as opposed to the LE10H's 82 turns (early) and 86 turns (late).
Not weighted down to kill efficiency to match the 2235H/2245H but rather to smooth response and increase bandwidth. It's bandwidth is greater than the newer 2123H. It's smoother than the 2123H and goes lower but it can't handle the power and doesn't have the efficiency of the 2123H. The 2108/2108H is it's 8-inch cousin. Same magnetic assembly and 3-inch edgewound copper ribbon voice coil. Used in the 4315/4315B. Awesome midbass transducers.