On Fri, Jul 03, 2026 at 01:51:21PM +0200, Hermann Meyer wrote:
> Regarding the phase response: the plugin uses minimum-phase impulse
> responses processed through a partitioned convolution engine.
That is clear.
> The Ardour spectrum analyzer confirms linear-phase behavior
> in the output, which is consistent with the design.
Either Ardour's output is wrong or you fail to interpret it
correctly.
> The term "linear-phase" in the description
> refers to the measured output response, not the IR symmetry — I agree that
> this could be stated more precisely in the documentation and will clarify
> it.
If an EQ is said to have a linear phase response that means that
its phase response corresponds to just a delay, so phase is a
linear funcion of frequency, whatever the amplitude response.
That is the only accepted meaning of the term 'linear phase response',
and it requires that the IR is symmetric. Using the phrase with any
other meaning is just misleading.
Can be that Ardour shows you a straigth line. Either that is wrong
or you fail to interpret it correctly.
> Regarding the latency: Master Mode operates at 128 samples latency, Live
> Mode at 0 samples. If your measurements show different values, I would be
> interested to know how you measured them, as my own measurements
> consistently show these values.
I used both zita-scope and JackSignal [1], they give exactly the same
result:
Master mode ('Live' shown in the GUI): 128 samples
Live mode ('Master' shown in the GUI): 256 samples
Plus after Bypass on then off in one the two modes (I forget ATM
which one) will result in 24 ms latency until the mode is changed.
[1] As usual, when a test does not produce the expected result,
I will first mistrust my own tools or procedures, and use a second
method to check things.
Ciao,
--
FA
