Paul Klipsch won a Silver Medal from the Audio Engineering Society. Before that happened, he sent me autographed copies of a collection of his papers and his dealer newsletters called "Dope from Hope."
Here's a scan from the AES papers on IM distortion, using the Bose 901, which RAMMED bass and treble into 9 small 1 ohm drivers in series in a small box via an outboard "smiley face" active EQ box.
You can see the gross sidebands that are produced and NOT in the original signal. This is why BIG HORNS RULE when you want low distortion and full dynamics at the "proper" SPL for all music.
