Aside from the obvious (power handling, sensitivity, price), what are the pyhsical differences between SQ and SPL subwoofers? I know there is a massive quality difference between $100 subs and $400 ID subs but what actually makes that difference other than materials. Voice coil diameter? Cone composition? Basket material? Etc.
Example: What is the difference between my RF Power DVCs and Joey Soundgood's IDQ12v3s?