Reply To: Dayton KABD + Sigma Studio

Blog Forums DSP Dayton KABD + Sigma Studio Reply To: Dayton KABD + Sigma Studio


@elliottdesigns @123toid – So, I need to flash to see how many instructions this design is over, but this is my most recent design for these boards. I’ll probably be pulling out the FIR filter because not enough instructions to be effective. Also, the low end time delay can likely be removed in entirely. The reason is because the frequency is the longest and that driver is the farthest from the microphone. As such, pushing to later the tweeter and mid-woofer should be enough to get them time aligned. Meanwhile, the same is likely true with the gain modules, as the largest driver is usually the least sensitive. So entering a negative value to volume level will likely allow the removal on one of the drivers to then volume level them.

Couple good links. Basically, the first one explains how to window in REW effectively and how to calculate what frequency is the cutoff for the reading. If you do a windowed and overlay that with a ground measurement, you can then come up with a firm reading of what is going on with the driver.

Then you can use the built in REW algorithms to recommend the IIR PEQ filters to use with them set on using either the ground measurement or the gated measurement frequency crossover point. After you put those corrections in the PEQ filter (after first volume leveling and time aligning the drivers, then creating the crossover), you are pretty well done. After that, you fill in the value for the high pass for the low end, then you use the time alignment and gain at the left of the diagram to volume level the speakers for where you are going to be listening (so you do an average of the seating positions to come up with these values) and time align them to finish it off for in room response.

With all that, there isn’t much left for any FIR. I’ll have to see if a baffle step compensation could fit in or not. But it is a start.