@elliottdesigns – So, here is a comparison of memory requirements for extended depth bi-quads as compared to FIR filters with single precision with 10,000 to the sub, then 5,000 each to the mids and tweeter. Just thought you would be interested in understanding the difference in required instructions size and difference in memory requirements. It shows why PEQs are still used, because you can offload the massive lift to PEQ filters, then fix up the linear phase after the fact with FIR. But you want the majority of the heavy lifting to be done before a FIR filter to try to make its work easier.

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