I am just kind of confused why one sub that has a 3" voice coil can have a much less power handeling as a sub with the same size voice coil? For instance, my 12" Ti has a 3" voice coil and has a 750 wrms rating. While a FI BTL or Q have a 2000 and 1000 wrms rating, respectively? Just a quick simple question.
I'm not exactly sure but my guess would be a stiffer suspension and more moving mass would equal in a higher rating due to the driver needing more power to get moving. Some drivers use different coil windings but I'm not sure how that affects the rms rating ...
wire size, number of turns, motor esign for cooling the coil, all play factors in this. generally, with all else the same, a larger coil diameter gives you better cooling and the ability to have a larger diameter motor ring (magnet) which gives loads stronger magnetic field tahn stacking does. However, all othr things aren't always the same, and thinner wire, or less wire used (taller or shorter coil former) will bear an effect on the power handling. So does how well the coil is vented.