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Measurements

KFilter6 can combine simulated loudspeaker behaviour with measured SPL data.

Import workflow

Absolute SPL measurement data can be imported and transformed into a relative correction curve. The import workflow supports:

  • 0 dB calibration
  • a selectable correction-frequency window
  • optional logarithmic fades at the boundaries

Only the resulting relative correction points become project data. The original raw measurement file, absolute raw levels and import-calibration settings are not stored as part of the project.

Correction behaviour

Each driver can have an independent measurement/correction curve.

A project-wide Merge Measurements option can apply the correction to:

  • individual driver SPL curves
  • vector SPL sum
  • energetic SPL sum

A per-driver Hide Measurement state can suppress that driver's correction.

Processing order

Measurement correction is applied after the complex processing stages:

Driver
 -> Active Filter
 -> Baffle / Diffraction
 -> Floor Reflection
 -> Measurement amplitude correction

The stored correction is currently scalar magnitude data; it does not add measured phase.

FRD export

Stored relative correction points can be exported in three-column FRD form. The exported phase column is neutral 0 deg because the correction curve itself does not contain measured phase information.