Lab.gruppen's PLM Series preset suitable for JBL's VTX B18 sub-speaker, V0.1 Rel 1.1.1

Application notes:
The preset is low-passed at 80 Hz,
The filter is IIR and output 1 is front and output 2 is rear firing for cardioid.

Technical info:
* Amp Gain is 35 dB
* MaxRMS limiter threshold at +7 dBu (Sub)
* ISVPL threshold at 180 Vpk (SUB) 
* MaxPeak limiter threshold at maximum factory value (i.e. +24 dBu-pk)
 - The ISVPL threshold corresponds to a MaxPeak limiter threshold at 
    +12.3 dBu-pk (SUB)
