If my late 70's L222 LE14A are alnico, should I see about getting them re-gaussed? If I still can?
Bass response has changed. For lack of a better description, they can't take it. It is almost like the magnet is weak and lets the voice coil push/pull to an extreme point. They were re-foamed by OC Speaker 2 years ago. As were the PR15c.
Another question. Based on a pic I sent to him of the PR BEFORE I sent it for new foam, Steve G says they are missing the tuning discs. I just pulled one out of the cab. There are no extra discs mounted. To determine how much weight to use requires knowing the cube of the box. Since the L222 cross-section is a trapezoid the area is h/2 (b1 + b2). H = 13", b1 = 18" and b2 = 12". I calc 192 sq inches. The height of the bass box is 32.5". Times the area gives 6337.5 cubic inches. Divided by 1728 cubic inches in a cubic foot I get 3.66 cubic feet for the L222 bass box. Using the latest chart posted by Giskard (and rounding to 4 cubic feet, I should have 3 20g discs mounted.
Am I off base here? I assume a 60g metal disc would also work?