Do you find that the subs add much to your system?
To be honest I haven't really given them a good a/b listen, i.e., hooked them up only a day after I installed the 3.7s.
I recalabrated them with the DSPEAKER 8033s and have set the bypass at 30hz. My wife heads out for a long weekend in mid-March, I'm going to sit down then and systematically run through some 'reference' songs I use to see if it is really necessary and/or additive to the listening experience.