If that's the case, they may just be using low latency IIR filtering as far as it will take them, and then "finishing" with FIR filters. They claim their reduced latency is due to a proprietary hybrid filtering method that isn't fully IIR or FIR. I don't think Dirac is doing less, they may be doing it differently than their competitors. If you want to try out convolution before paying for one of those software suites, there are some free convolution filter design tools out there. JRiver's built in PEQ can't do everything convolution can do, but it can do a lot, and with much less latency. It's still a work in progress, but if you enjoy tweaking, I just wrote up a brief introductory guide to using free software for designing speaker/room correction in JRiver, here. Sorry I can't be more help on the specifics of the suites themselves, but there are plenty of folks here who can weigh in on the pluses and minuses. If your only concern is about routing internet audio through JRiver, JRiver offers a software loopback function that will allow you to funnel all system sound through JRiver. So any of the convolution based solutions will likely make it challenging to use them with internet video. This can be gotten around by ripping to mkv. The only exception I'm aware of is DVD disc playback, which is limited by microsoft's DVD navigator. Obviously added fixed latency is irrelevant for audio, and not always relevant for video, provided that you're playing the video in JRiver. I've made a lot of different convolution filters using the free tool RePhase, and almost all of them have introduced enough latency that I couldn't use them with internet video. So even if there is a difference between Acourate and Dirac in the software latency department, the convolution filter itself is an unavoidable source of (usually quite significant) latency. Depending on the length of the filter, you will have more or less latency, that's just how convolution works. The more you're trying to "do" in the convolution filter, the longer the filter will need to be in order to work correctly. I haven't used the full versions of any of the three suites at length, but I wanted to comment on your 2) point: any convolution based room correction solution is going to introduce latency.
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