Generally, you will get higher acoustic output and greater efficiency/sensitivity from systems with larger drivers. When you see systems with smaller bass drivers rated to delve very low, they may be more linear into the low bass, but they will not play very loud at the lowest frequencies and they will sacrifice some efficiency to get there. So you will need more amplifier power to push them. There are always trade offs and compromises in speaker design; but so far, no designer has found a way to beat the laws of physics.
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