I might be buying a pair of home made Altec VoTT and Peavey

[Audio_by_Goodwill]

They remind me of a 1221A stage monitor put into a regular box....... except the 1221A used the 417-8H (12" driver), and it's own special crossover.

[VolvoHeretic]

Does anybody know the difference between the 418-8H II, 421-8H II and a 416-xx and why the 418/421 have a free air resonance of 35hz while the same looking 416's Fs is 24hz? (GM, Old Guy?) Surely it can’t just be the dust cap, and if so, I will just glue a paper dust cap over the aluminum one? If a heaver cone lowers the Fs, and I just start gluing on one gram dimes with rubber cement, (or magnets stuck together on each side of the cone) will it lower the free air resonance and help out the bottom end? I guess I have to have a call with Great Plains Audio on Monday.

Here is a picture of my EQ which is sounding pretty good, with amp bass tone cranked up also. I am forcing these things to play low although I am only sitting three feet away at the moment and I don’t have them cranked up since the little woman is in bed. (it's still not what you would call soft)