1 large subwoofer or 2 smaller ones...?


Looking for opinions on whether to use one large subwoofer (Martin Logan Descent i) vs 2 smaller subs of the same design (ML Depth i). Cost for the 2 setups would be similar, but my room is better suited to support 1 sub than 2. Main speakers are Martin Logan Ascent's.
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One larger one should be sufficient. Any sound below 100 HZ is non -directional.
Leaving aside the issue of stereo vs. mono, it should be much easier to get smoother response from 2 subs.
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