Marani Pro Audio PDA500PF, Quick User Manual

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Clip limiter frame: Here is possible to set a Clip limiter on outputs able to limit the output itself up to
-6dBu from its maximum level. This Clip limiter can be useful, after the Peak Limiter on the output
paths, to dramatically cut with infinite attack time, the output signal, there where APEC is used for
processing signals going to external Class D amplifiers, in example, without internal Limiting circuitry.
FIR phase correction frame: here are available the controls for the use of a 512 Taps FIR located on
the Input path, which has been added mainly for being used for PHASE CORRECTION purposes, there
where used together with the “Wizard” process embedded in the PDA500PF Sw (see NOTE A), able to
control a measurement process bringing to the calculation of the necessary coefficients for the phase
linearization of a 2 way system.
Nevertheless, the FIR on the input paths can also work with coefficients loaded by external files and
generated by Third Party Sw able to generate FIR coefficients. In this case, the FIR turn to be a up to
512 Taps standard FIR, which can be loaded with any sort of coefficients for getting any sort of result
(PEQ, Min Phase, Lin Phase, etc.). For the use of the external coefficients, need to generate them as
text files and import them. See the details on the NOTE B.
- Wizard : this control is launching the “Wizard” Sw for the related FIR (see NOTE A for the Wizard Sw)
- FIR Import : here external coefficients can be imported into the FIR. Pressing the “FIR Import” button,
the following window open and from the clicking on the LOAD icon, a .txt file (see NOTE B) with the
Third Party calculated coefficients can be imported.
The Amplitude and Phase responses can be seen on the graphic which will show the characteristics of
the imported filter.
-
View FIR : once imported, or even internally generated, the FIR coefficients, the response of the FIR
can be seen recalling it on graphic just pressing the 'View FIR” button.
-
Byp : this check box is useful for making the loaded Fir Active or not. When not active, checked box,
the FIR is simply transparent on the related input path. The Byp can therefore be used as powerful
tool for A/B comparison between the system responses using or not the FIR.