No. All Genelec monitors of the same model are individually calibrated at the factory to a single, consistent reference. This ensures that any two monitors of the same model will match each other accurately.

Because of this strict model‑wide calibration, you can combine any Genelec monitors of the same model and trust they will perform as a perfectly matched pair right out of the box.

This also means that sequential serial numbers are not required, and monitors will still match perfectly even when the serial numbers are not in sequence.