Hello all -- I thought I’d provide an update for anyone who is interested:
Since I started this thread, I’d been researching various different speakers as an upgrade to my Triton 7’s, with many possible ideas coming from suggestions on this thread as well as other threads here on AG. I only managed to audition one additional speaker (Revel F228Be) and liked it, but just wasn’t sure how it would sound in my large problematic L-shaped room, and couldn’t justify a purchase of that magnitude without home audition, which the dealer wasn’t willing to provide.
Then, over Thanksgiving, I saw a promotion for SVS SB12-NSD subs substantially discounted at $400 each. Knowing that SVS allows free returns, I purchased a pair, just to see if subs would help with the bigger sound that was one of the main things I didn’t feel I was getting from my T7’s in my room.
I had thought that the TRefs when I auditioned them only provided ~40% bigger sound than my T7’s (IMO), and these two entry-level subs get me at least 20-30% bigger sound (IMO). With the subs, I can "feel" the bass and mid-bass, and it seems to me that some of the mid-range is fuller as well. To me, all of that adds up to a substantial improvement in depth/bigger sound. (In contrast, my Hsu 15-inch sub hadn’t seemed to help much, perhaps because it’s positioned in the corner of the "L" that is my room -- that sub’s size doesn’t allow any other positioning).
I would still like a little more detail, but upgrading the T7's is no longer feeling *urgent*. Thanks to all who provided various input, and especially to @jackd and @winefix, who germinated the idea of multiple subs.