class

`SushiDSP::PowerAmpFeedback`

The feedback leg from the speaker tap to the phase inverter's second grid.

Declared in: include/SushiDSP/circuits/PowerAmpFeedback.hpp

Two capacitors pull the leg's response in opposite directions: the one across the shaping resistor bridges it above its corner, which feeds back more treble, while the one across the divider's ground leg shunts it above its own corner, which feeds back less. Which wins where is what the solve answers, and it is why the leg is not a shelf. The presence pot sits in series with the tap, so opening it removes feedback rather than shunting it away.

Public member functions

PowerAmpFeedback(double sample_rate, const PowerAmpFeedbackComponents &components, const PowerAmpFeedbackTermination &termination={})

Parameters

sample_rate: The rate the leg runs at, in hertz.
components: The leg's component values.
termination: What the inverter presents at the tail node.

void set_presence(float normalized)

Sets the presence pot's position and re-derives the matrices.

Parameters

normalized: Presence position in [0, 1]; 0 is the whole pot shorted out, so the deepest feedback and the darkest tone. Values outside are clamped.

float process_sample(float tap_voltage)

Processes one sample.

Audio-thread safe.

Parameters

tap_voltage: The voltage at the speaker tap for this sample.

Returns

The voltage the leg puts on the inverter's second grid.

void reset()

Clears the reactive state.