Forum Replies Created
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7 August 2020 at 7:06 am #258Very high phase rotations, particularly close in frequency, can get lost in measurements due to smoothing. And so you can’t assume that they are actually there and therefore correctable with filtering. Generally if you find you need 8 x 2nd order all-pass filters, then I’d suggest revisiting your loudspeaker design. It sounds like there are time alignment issues or something else. Guiding you on loudspeaker design is outside the scope of our support. I’d suggest posting your loudspeaker design on other loudspeaker forums and asking for tips on how to optimise it.
Regards,
EA Support
6 August 2020 at 10:08 pm #256Hi Kohno,
Looking at the images in your PPT file, the measurement has 3×360 degree phase rotation coming into the Auto Phase tab. (This is quite unusual. Maybe you have a 12th order crossover filter?) If you’re trying to unwrap this phase, it’s better to address this manually on the Phase Adjust tab with 3 x 2nd order all-pass filters set for maximum phase. (The Auto Mag tab can’t always follow 360 degree phase rotations – particularly ones as steep as this – depending on the amount of smoothing in use.) And keep in mind a FIR filter with 3×360 degree phase rotation will be quite long.
Best,
EA Support
1 August 2020 at 8:46 pm #246It’s there. Toggle the “Show FIR filtered loudspeaker” checkbox. When unchecked, it’s the response of the FIR filter plug IIR, gain polarity and delay.
EA Support
24 July 2020 at 3:30 am #238I looked over your system and project files.
The export format was set for “Binary file (32 bit, int)”, not “Binary file (32 bit, float)”. This will likely cause miniDSP to see NaN when importing.
Regarding filtering, there was an 2nd order all-pass IIR at 38 Hz and a 2nd order maximum-phase all-pass on the “FIR Phase Adjust” tab but the tab’s “Enable” was unchecked. Try removing the IIR filter and checking the “Enable” on the “FIR Phase Adjust” tab. This should give you a FIR that unwraps the LF phase for the measurement in the project.
Best,
EA Support
22 July 2020 at 9:46 pm #237Can you please email info at eclipseaudio.com and attached one of the bin files (that causes NaN) with miniDSP and the FIR Designer M system and project files used create the bin file?
Best,
EA Support
22 July 2020 at 9:28 am #235What format are you exporting?
I think miniDSP loads 32bit floating point binary files.Best,
EA Support
17 July 2020 at 9:28 pm #233Great. High delay in measurements is often the problem.
Best,
EA Support
17 July 2020 at 7:08 am #231In the editor, click the IMG button and embed a link to an image sharing site.
Best,
EA Support
16 July 2020 at 6:08 pm #226Can you please provide a screenshot of the Import tab and Auto Phase tab?
Best,
EA Support
14 July 2020 at 10:38 pm #223>> Is it correct to assume that this loudspeaker is displaying non-minimum phase behavior
>> around the crossover region when one looks at the 2-nd order all-pass response of its
>> phase response?Yes.
>> Can the phase adjustments being done around the crossover region, to flatten the phase
>> response, be deemed to be “maximum phase” corrections seeing that we are inverting an
>> all-pass response?Yes. But remember this is just one loudspeaker. Each loudspeaker is different.
>> Is the flattening of both the magnitude (EQ boosting) and phase response around the
>> crossover region not going to introduce audible artifacts like pre-ringing?Maybe. Linear-phase brick-wall crossovers also have pre-ringing but it’s rare that people say they think they can hear it.
>> Can the same EQ concepts be readily applied in correcting the room transfer function
>> displaying non-minimum phase characteristics at the listening/measurement position?Yes but I’d suggest doing a literature search on the topics of room impulse response correction and inverting room impulse responses; maybe in the Audio Engineering Society resource library.
Best,
EA Support
12 July 2020 at 11:36 pm #202In the tutorial the 200 Hz High Shelf is maximum phase. Try changing it in your project from minimum to maximum phase and see what happens.
Best,
EA Support -
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