EV uses the term FIR-drive to describe the processing suite. They may be using the FIR block to implement the minimum phase (normal PEQ), because these filters have all of their energy up front and therefore do not impart any additional delay.
However, they are not using FIR filters for phase correction in the sub (non-minimum phase). When FIR filters are used in this way, the resulting latency is directly tied to the frequency of interests and no fancy new maths can fix that.
I originally suspected the "FIR Drive" was referring to the same DSP module used in each box in the range, and thus could be justified in terms of its presence on the subs - even if they did not use FIR filter capability.
When you refer to the EV processing potentially used for minimum phase, do you mean as correction for the effects of high and low pass crossovers on the sub? Or would it reduce the phase shift inherent in the design reflex subwoofers?
I assume you mean the phase shift caused by normal PEQ, to achieve correction in a similar way to an all pass filter used to correct phase shifts - such as those caused by IIR crossover filters?
I have somewhere interesting learning materials, separate from the MLA stuff. These describe how FIR filter creation involves calculating numbers of "taps" - which determined unavoidable issues, such as how latency increases as FIR filters are applied to decreasing frequencies.
Unfortunately right now I can't find those papers on the science, theory and practical uses for modern digital filters. However they would have been written some time ago now.
I appreciate this is relatively young technology, that could have been improved in recent years - such as via the "better maths" suggested above.
Yet I had a strong impression that the latency increase as frequency decreases issue with FIR audio filters, was not a characteristic expected to improve as the technology used to create / implement them advanced.
Sadly my understanding is compromised through not using this in any practical way right now. However I expect to in the future, and I find these subjects interesting in their own right!
Sent from my GT-I8160