I have a pair of JBL 2235, each in its own 5 ft^3 cabinets that I use in my main system. The bass from these are incredible and would complement the Goodmans well. I'm sure I can get "good" bass from the Goodmans with a well aligned cabinet, but it will never be as deep and loud as the JBL's.

Questions:

If I intend to integrate the Goodmans with the JBLs, can I get away with a simple sealed box? I like to keep the cabinet as small and simple as possible. I know that a larger vented box, or even BLH can extend the bass lower, but what are the advantages of taking the fullrange down to, say, 50Hz if I'm using a "sub"?

If the sealed box is okay, what size? There's little to none information on the web about these speakers. From this forum's experience with similar drivers, how low will it go in a sealed enclosure? The drivers currently sit in a 2 ft^3 vented.

thx,
Gar.

When you crossed your fullrange to sub, did you apply any high pass on the fullrange, or did you just let it die out naturally?

For example, my trusonic can do 45 hz in its BR box. So if is let it die naturally i'd probably be crossing it at 24 db at around 40 db. But the IM distortion would be the same as without a sub.
Crossing it actively at 90 hz takes care of that.
It actually sounds significantly better: the results of IM distortion are not the phantom metrics that plague the dreams of many "speaker designers", it's very clearly audible.
Hoep this helps
-akhilesh