Download Plugin Alliance SPL PQ 1.1 full version program the free setup for Windows. The PQ Mastering Equalizer is a fully parametric, dual-channel five-band equalizer, based on SPL’s pioneering 120V rail technology. Able to switch between constant and proportional Q modes with the push of a button, this kind of circuit has not yet been achieved in any other analog equalizer. Plugin Alliance SPL PQ Overview Plugin Alliance SPL PQ Read More …