Forum Replies Created
22 April 2022 at 7:24 am #466
Sorry, I don’t understand the question. Using boosts or cuts, to push a response toward target, is completely up to the user, e.g. the Mag Adjust tab (and if the target response is visually too high, it can be lowered using the “Zero Adjust” slider). The Auto Mag tab inherently does both boosts and cuts but we are looking at algorithmic changes to give some user control of boosts and cuts independently.
EA Support16 April 2022 at 12:06 pm #463
Suggestion noted; thanks.
In short, the wavelet view gives a “frequency versus time” map of the loudspeaker response. The wavelet view of an ideal impulse is shown by default when the program is started. Once a measurement is loaded on the import tab, the waveleft view shows the frequency versus time map of the measurement. If the loudspeaker has, for example, “ringing” at various frequencies, the wavelet view will show patches to the right of the ideal wavelet shape at those frequencies. IIR crossovers, all-pass filters and other high-Q filtering will all cause some time smear in the loudspeaker response to the right of the “ideal” shape. Whether this is audible or not is somewhat subjective and varies with frequency; since the human auditory system performs somewhat differently at different frequencies.
With FIR filtering it’s possible to create mixed phase filters that undo some of the phase changes that cause the time smear. For example, try using auto-mag and auto-phase on a loudspeaker measurement and watch how the wavelet view changes. Or, without any measurements loaded, set channel 1 to a low-pass LR 4th order crossover filter and channel 2 to a high-pass LR 4th order crossover filter, so that the combined magnitude sums flat. What remains is a phase change due to the crossover filter. Note what the phase change looks like on the wavelet view.
For more detailed info, maybe google “wavelet analysis of loudspeakers.” Don Keele has one AES paper on the topic. A related analysis tool is the “waterfall plot” and you may find useful information on this also.
EA Support16 April 2022 at 11:43 am #462
Currently IIR settings need to be copied manually across into the Linea Research control software. (There is no export/import path to move the filters to Linea Research.) We have been in discussions with Linea Research about making this process easier, but I can’t give any timeline.
EA Support2 April 2022 at 1:01 pm #457
That’s correct; there’s no target phase on the IIR tab right now. And yes, we should add this. (It’s on the TODO list.)
In the meantime, you could open “Second View” and watch the phase on another tab. For example on the Phase Adjust or Auto Phase tab.
EA Support14 March 2022 at 4:06 pm #452
We’ve taken a look at the Processor Editor software.
Regarding the IIR filtering, many brands have different interpretations of Q (or BW) in their parametric and shelf filters. And some have different frequency interpretations for Bessel filters.
We may consider adding this processor to our IIR filter modes, however it can take many months to work out the math for a new IIR mode and create all the conversion functions to/from all the existing Branded IIR modes that we have in our products.
In the meantime, I sugges experimenting with the filters in each of the existing IIR modes to see which ones may closely match the T.racks.
EA Support28 February 2022 at 6:50 am #447
Take a look at
The file starts with:
* Measurement data measured by REW V5.20.5
* Source: EQ window target shape
* Dated: Feb 27, 2022 11:39:39 AM
* REW Settings:
* C-weighting compensation: Off
* Target level: 75.0 dB
* Measurement: Target Main Native
* Smoothing: 1/48 octave
* Frequency Step: 96 ppo
* Start Frequency: 2.5 Hz
* Freq(Hz), dBFS(dBFS)
It’s a 2 column file with Freq & Magnitude but “FIR Creator” requires 3 or 4 column for Freq|Mag|Phase|Coherence. Since there are so many different ways TXT and CSV files can be created, we’ve had to put some rules around how we import files. We do look for a few special cases, and for REW, we currently look for the starting line
* Impulse Response data saved by REW
We’ll look at adding something for this file’s header also.
In the meantime I suggest copying this into Excel, adding a 3rd column of 0’s, and saving as a 3 column txt file.
Alternatively, if your intended target response is something simple, use “FIR Creator” in “Direct Design” mode, make your target response, export as a FIR Designer Target File (FDT) and import this on the Target tab.
EA Support20 February 2022 at 7:34 am #434
On the “Import” tab, uncheck “Normalise magnitude.” This will bring the HF back up to 0 dB.
(Notice that the “Magnitude offset (dB)” setting is showing that -2.0 dB is being applied by the “Normalise magnitude” process.)
BTW it looks like the sample rate used to make the filter is different to the sample rate of the app when loading the filter. Note how the phase peak is just below 200 Hz in the upper plot and just below 100 Hz in the lower plot.
EA Support19 February 2022 at 7:19 am #427
Version 2.2.x introduced Marani IIR filters and a “FIR output sample rate” parameter, which is different to the channel sample rate used for IIR and gain & delay. The “FIR output sample rate” parameter broke the Wavelet view for cases where the “FIR output sample rate” is different to the channel sample rate. We are currently working on a fix. (The filters are correct; it’s just the Wavelet display that is broken.)
I’d suggest confirming that the channel sample rate and “FIR output sample rate” parameter are the same. If they are the same and you still see problems with the Wavelet view, for now please downgrade to the most recent 2.1 release; 2.1.11. If you don’t have access to the downloads page, email us at the info address on the https://eclipseaudio.com/contact/ page.
And if you have time, can you email us your system (fds) and project (fdp) files.