well, it's not working out with 2nd 12Kd....but we got XL's swapped it, box reinforced from Level 4 abuse.....and showing a 156.8 @ 52Hz. XL's seem to have a higher fs and are showing a lil more impedance rise....so we'll see how it does at the comp this weekend. Will have lil conflict of interest this time as I'm pulling out my comp car since it's my store's 11th anniversary competition....