Quote Originally Posted by Cal Weldon View Post
I see the 815 cabinet was available with either driver and the specs available for the day were remarkably similar.

Agreed, but bear in mind that is without the reflex port...that is where most of the effect of the 421 would show.

The 815 is a "truncated" 210 horn according to the early Altec sheets. They dropped that description later, but we are looking at an 80 Hz horn.

Either 15 will get to 80 no sweat.