Differences are minimal
I just had a custom box built for my 2 10 inch RE Audio SE Pros. It was built exactly to specs tuned at 36hz. I just unistalled my 15 RF T1also in a custom box tuned to 36hz. Both were powered by my JL Audio 1000/1 V2. Honestly i cannot hear a difference between my 2 10s and 1 15. The 15 is obviously deeper but my 2 10s keep up stride for stride. Their bass response is very deep as well. I drive a Toyota 4-Runner. What gives? Why is the difference between the two so small? I know 1 15 has more cone area.
02 4-Runner-Alpe CDE-HD148BT-Acntrl 3.2, Epictr, Alpe PDX F4 on Crssfre Sprates-Alpe PDX M12 on JL Audio HO210G-W3v3
90 300zx-Alpe CDE-147BT-Acntrl 3.1, Epictr, Alpe PDR F50 on Crssfre Separates-Alpe PDR M65 on NVX XQW104 @35hz
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