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Phase coherence meter8/2/2023 Crossover phase and points are largely correct or incorrect - but EQ is subjective. Still, not being able to model EQ is a big one - and EQ is critically important. ![]() Also, I agree that being able to sum drivers and time shift to get x-over phase right is better than REW, with its timing reference method. FIFO averaging gives a long time average, but moving the mic removes HF measurements, presumably because the phase is changing so much. I did realise after posting that the "math source" can combine measurements - which was the main missing piece. I was just doing at my desk with my near field setup - I didn't bother to go out to the car. It was working as it should and clearly giving valid measurements. I did use one input as a loopback (headphone O/P of the amp, actually) and the mic into the other. I have an ECM999 mic and an old Edirol USB sound card. Click the measurement icon and adjust the gain appropriately or better yet, use your dsp to do this. Changing levels is super simple but done in real time. Time delay is the phase graph, this is 10000000000x more accurate than any other way to align drivers. It just does more calculations with higher power, so there should be some minor changes in your measurements.Ģ) The newest version 3.1 has vector averaging of stored results now. FFT power determines how much power you are willing to devote to the program via your computer. Preferably some audio interface device like the ones mentioned previously for the best results.Ī lot of your questions are answered in the quick start guide: ġ) You can average up to 100 measurements (Like REW's RTA averaging only with ALL of the info) - Change measurement to FIFO instead of LPF. If you don't have a loopback, this program would be pointless. Now this is another tool in your toolbox if you have a way of doing a loopback. So it needs to be quick and in real time. They aren't worried about it being "perfect" and do not get a lot of time to do these things. In reality though, Open sound meter isn't made for the home or car users, this is made for a professional that is setting up for a concert, a play, etc. Rew still has some advantages for taking a measurement than applying EQ in their EQ window. That is only a small part of the whole tuning process but what people spend the most time on. You get to see all of that information change in real time compared to REW where you would have to do a sweep, make a change, do another sweep and see if it worked. It shows you EVERYTHING REW shows you when you do a sweep (REW RTA doesn't have nearly this info) in real time. Programs like this are real time measurements programs, that is their benefit. But I don't see how I can do what I can with REW? ![]() Seems like it might be a useful final validation or tune of the odd 1/100th or 10th of a ms. For aligning drivers/crossovers, I guess I can change and watch realtime, but a way of summing measurements and changing level/time delay would be useful? Or is the workflow with this tool just to do it all real time? I'd like to be able to average 3 or 4 as per REW. And of course, surely we need to be able to measure several spots. Even setting long buffers, high FFT powers etc, I get quite a bit of variety between measurements. ![]() Some things that I can't see how to do, though:ġ.
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