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DSP - calibration and limiter presets

Speaker model

Descriptive loudspeaker model for the protection profile. The name does not replace impedance and power specifications.

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Amplifier model

Descriptive amplifier model for the protection profile.

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Impedance

Nominal load impedance used to calculate the safe output voltage.

1-64 ohms, step 0.1 ohm.

Speaker RMS

Rated RMS loudspeaker power used in the safe-voltage calculation.

At least 1 W, step 1 W; the GUI specifies no upper bound.

Amplifier RMS

Amplifier RMS power at the selected load. The calculation uses the lower of the available speaker and amplifier ratings.

At least 1 W, step 1 W; the GUI specifies no upper bound.

Safety factor

Reduces the calculated permitted power to provide a safety margin.

0.1-1, step 0.05; default 0.8.

Full-scale Vrms

Output voltage corresponding to digital full scale in the actual gain chain. Needed to convert a safe RMS voltage into a dBFS threshold.

At least 0.001 Vrms, step 0.01. Calibration derives it from the measured reference voltage.

Calibration offset

Additional calibration correction used to calculate the protection threshold.

-60 to +60 dB, step 0.1 dB.

RMS window

Averaging period for RMS protection.

50-1000 ms, step 10 ms; default 200 ms.

Peak ceiling

Peak limit in the output protection profile.

-60 to 0 dBFS, step 0.5 dB.

Calibration zone

Chooses the zone receiving the reference tone.

Available enabled zones.

Play reference / Stop tone

Starts or stops the reference tone used to measure amplifier voltage. Follow the displayed gain and mute instructions before calibrating.

444 Hz at -20 dBFS; this action produces actual sound.

Measured reference Vrms

Measured RMS output voltage while the reference tone is playing.

At least 0.001 Vrms, step 0.01; enter a measurement, not an estimate.

Apply measurement

Sets Full-scale Vrms to measured voltage / 0.1, offset to 0 and mode to calibrated.

Available after a valid measured-voltage entry.

Load module preset

Loads the processor settings stored in this module slot, rather than a whole scene.

Names are configurable. An unsaved AGC/Loudness slot cannot be loaded.

Save module preset

Stores the current module state in this slot, replacing its previous contents.

Module snapshot; the card shows the last saved time.

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