Just an update to those of us that are using QSYS for the DSP on an M2 (or other speakers). As of software version 7.2.1, issued today (12/12/18), it now supports 16,384 taps on the FIR filters so pos' FIR filter solution should be able to be incorporated into designs without the need of extra PEQ filters on the LF section.

Previously, in 7.2.0, QSC added FIR filter capability in their amplifiers. The current tap limitation (by device) is:


  • DPA-Q/CXD-Q 4-channel amplifiers: 1,024 taps
  • DPA-QCXD-Q 8-channel amplifiers: 200 taps
  • DataPort cards/amplifiers: 200 taps
  • Core: 16,384 taps

So, for the M2, you'll need to use the CORE's FIR filters.

-Steve