I use a REL Storm MK III with my SHL5's. Is it seamless... no. Is it as good as my time with the M-40.1's... no. But still a nice sounding set up. The sub adds some fullness and body to the sound and expands the soundstage.
That's a large room... 40.1's would be my recommendation. I've owned them before. Your amp is plenty powerful enough. Anything less would benefit from a subwoofer.
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