It occurred to me that I may have managed to disrupt this thread with my questions. If this is the case, perhaps I should continue it in a new thread(?). Just askin'.
I'm sitting in my living room listening to music while my new Sabaj D5 slowly burns in on my Taiwan-based system (approximately 10 hours now). The music certainly sounds nice, and I detect none of the metallic notes that my old Gustard ESS9018 DAC was guilty of producing. This is <so far> performing admirably considering the very low price of $429 delivered.
Without my checking my earlier posts in this thread, I'm thinking I haven't explained myself well enough. Posters keep pointing out that there is enough bass/low bass for them. Yet, my objective isn't solely about filling in the lowest octaves; it is more about first creating even better (cleaner, stronger, clearer??) midrange by relieving the midwoofers of the duty of producing bass in the <100Hz range, and secondly introducing stronger sub-100Hz bass with ~10" woofers in a room that sucks out huge amounts of bass due to its huge cu ft area.
If I were to place Carreras or REV 7s in my TV/family room in Oregon, the bass would still be sucked out of the listening space and disappear into the kitchen or upstairs hallway. I would be left with nearly the same problem that I already have with my Jeff Bagby Adelphos. My money would be much better spent on a couple of sealed Rythmik 15" subs -
assuming my wife could be persuaded to live with them.
Before I began thinking about trying Carreras or REV 7s, I had been thinking about commissioning a pair of fairly large three-ways whose goals were excellent midrange and bass to <approx> 30Hz. My commissioning three-ways is still a possibility. If I bought a pair of Fritz's speakers for this listening space, I would still have to buy <at least> one more subwoofer. It was while reading this thread that I hit upon the <apparently naive> assumption that adding a couple of 10" woofers to the crossovers ought to be pretty simple. [In my imagination, many otherwise complex actions are often pretty simple.
]
As much trouble as all of this is, getting my wife to allow a different placement of gear across the left wall (which is a far better position for audio) is a
FAR MORE DIFFICULT endeavor.
In closing....
Here I am in my concrete living room listening to my Fritz LS/5-R two-ways marveling at how beautiful they sound <even without acoustic treatments in this room>. I've got my Sabaj D5 connected to my IceEdge 1200as2 amp via XLR - simple, minimalist, beautiful. My 84dB sensitivity LS/5-Rs are finally happy. Hopefully, the D5 will live up to my needs and wants, and I can sell my bulky preamp and extra amp.