I had a 1sc/rel sub combo once, and I thought the sound was good. The 1sc has no pretensions of being a full ranger. Its small woofer is an ideal match to its excellent tweeter, and the overlapping frequencies were blended seamlessly. Properly set up, the right sub can fill in the lower reaches without any discontinuities. While I haven't listened extensively to the 2.5 (only auditioned in stores), the dual challenge for such a design is to (1) avoid a hole in the middle, i.e., weak lower midrange, from trying to pull the woofer into performance at mid bass frequencies, and (2) inevitable failure in the low bass bottom octaves, suggesting the need for a subwoofer anyhow. As always, I recommend listening to both if you have a chance, and seeing which best meets your personal preferences. Good luck.
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