Difficult for me to provide hard data there, because my Basslink is running along with 2 10" MTX subs and a 250W MTX amp, in a different car. Also, the power output of the Kenwood is stated at 50W/2ohms+50W/2ohms Maximum (dual voice coil drive), the Basslink is 200W RMS. So, based on the rated power output, the speaker sizes, and my subjective ear response, I'd say the Basslink is the winner of the SPL level competition, but the Kenwood gets the nod for the most sound out of the smallest 'box'. We're comparing the Kenwood with a 5 1/4" active woofer and a 6 1/2" passive radiator, to the Basslink's 10" driver and 10" passive radiator.

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1986 560SL
2002 Toyota Camry
1993 Lexus