As I already touched on in your other thread, there isn't a huge difference between 15" and 10" speakers these days. The idea that 15" better produces low frequencies stems from the older days when everything was less efficient and less powerful, and heavy duty speakers were uncommon. On a modern cabinet the low extension usually comes from a port anyway; so you're not going to get any more bottom end from a 15 than a 10. There is no "sound" for 10" speakers or "sound" for 15" speakers. Far more important to the sound produced from a cabinet are the materials of the drivers, the cabinet itself, and the over-all construction and acoustics of the cabinet.
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