My next project, should it ever materialize will be the dca 5.5's in a BIB enclosure!
Otherwise just enjoying hte music every chance I get, which is really rare these days.

I would recommend the dca 5.5 over the 4's, but both are good drivers. The 5.5 have good enough highs and also good enough lows.
THe 4 have slightly better highs, but IMHO need a sub, actively crossed at about 80 hz. The 5.5's go down to about 60 but seem to go down lower (don't ask me how) in the PAWO enclosure.
According to other posts here, they go down to 30 hz in a BIB enclosure (well the enclosure goes down to 30 hz!). Imagine that in a 5.5 " driver. Pretty close to the holy grail eh?

I have some pairs of both, but I am certainly not willing to part with them.
Wayne, we need to have another audio meet soon...maybe listen to Mark's honky tonk badagonk system?
-akhilesh