Just a couple quick commments:The original LABsub has a compression ratio of 2:1. I have a modified pair at 3.0 compression ratio.
1 dB is .0000000029 psi
15 psi would be: 20log(15/.0000000029)= 194 dB
The actual peak horn throat SPL is more like 155 dB which is 0.2 psi.