For a long time I was afraid of all-pass and FIR filters because they seemed exotic and supposedly cause lots of delay, making them unusable for live sound. Turns out this was just an excuse I was using to avoid some mental hurdles. Do all-pass filters cause delay? Here's a measurement of my BLU-160. It's an output processor from BSS. Pretty boring. Here's that same measurement with 5ms of delay inserted. Let me draw your attention to the Live IR. It's the exact same shape as in … [Read more...]