Quote Originally Posted by bowtie427ss View Post
That's where we see the bulk of em for sure.

But(there's always gotta be a "but").............. the ole fella's spot on. It was quite a while back IIRC. GM worked out a large displacement ported box for the 411.

Altec also used it in a VOT "type" ported enclosure in the 9861.
Not wanting to come off as a total 'newbie' to the site, I did some searching based on all of your feedback. Found this:

Originally posted by GM:

"10.34 ft^3 net/Fb = ~21-18 Hz (depending on boundary and/or room gain), 32"h x 25.5"w x 22"d, driver at extreme top, 5" dia x 6-11" long vent 4" up from the bottom (all dims i.d.). Line at least the top, one side and back with 1" acoustic fiberglass stuffing down to just above the vent, though of course you may want more density depending on how well constructed the cab is."

I was starting to wonder if the 411 had any redeeming value which begs the question, what was Altec thinking when they designed it? Nowadays, I am not motivated enough to build custom cabinets. I think I will remove the 811 horn and reseal the Santiago, then biamp with the 511.

I have seen some posts recommend at least a second order slope (12db). Why not flatter (or steeper)? I will play with various slopes and xover frequencies until I get the sound I like but would appreciate any thoughts on this aspect.