Normal
I finally heard from B&C:Hello,the MF section on the DCX464 is delayed about 50 microseconds (0.05 ms) versus the HF section due to the different MF and HF sound path lengths inside the driver. Compensation of this delay may be useful or not, depending on the filter design which brings its own phase shift at crossover frequency. Let consider the FB4648 that is the passive crossover specifically designed for the DCX464-8 coupled with its horn ME464. The MF and HF filtered responses intersect just below 4 kHz at a level about 6 dB lower than the MF+HF summed level. This means that at the crossover point the MF and HF filtered section are in phase. This is possible because the phase shift introduced by the passive crossover compensates the one introduced by the two sections of driver alone. Hope this helps to clarify this matter. Best regards, Giacomo Bartolini
I finally heard from B&C:
Hello,
the MF section on the DCX464 is delayed about 50 microseconds (0.05 ms) versus the HF section due to the different MF and HF sound path lengths inside the driver. Compensation of this delay may be useful or not, depending on the filter design which brings its own phase shift at crossover frequency. Let consider the FB4648 that is the passive crossover specifically designed for the DCX464-8 coupled with its horn ME464. The MF and HF filtered responses intersect just below 4 kHz at a level about 6 dB lower than the MF+HF summed level. This means that at the crossover point the MF and HF filtered section are in phase. This is possible because the phase shift introduced by the passive crossover compensates the one introduced by the two sections of driver alone.
Hope this helps to clarify this matter.
Best regards, Giacomo Bartolini
