If you want more overall output you just need a bigger and better system. Speakers having + 3 dB greater sensitivity is the equivalent of doubling watts. Bigger speakers are usually more sensitive than smaller speakers plus larger speaker cones are better acoustically coupled to the air. The easiest way therefore will be to get bigger more sensitive speakers. While bigger speakers typically require less power, they at the same time typically handle more power. So after getting bigger better speakers the next step will be a bigger amplifier.

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