Would need to know more about the coil to accurately describe any pros or cons. If the voice coil is very short, then BL should be pretty high because almost all of the coil will be in the gap. Of course, once it starts moving, BL would drop very quickly. The spider is also going to be very small which could introduce some non-linearities.What are the pros/cons to that huge 3" coil? They look pretty nice!