Xabia's arms are:
Blazon: Escudo ibérico partido y entado en punta. En el primer cuartel, en campo de oro, cuatro palos de gules. En el segundo cuartel, en campo de azur, sobre olas de azur y plata, una torre de plata mazonada de sable sobre rocas de su color, surmontada de una flor de lis de oro. En el entado en punta, en campo de oro, cinco estrellas de azur, colocadas en sautor. Al timbre corona real abierta. Flanqueado la tarja del escudo dos eles de oro.
In this case the shield is blazoned as "Iberian" though its shape is hardly peculiar to Spain and Portugal. The two "L" supporters are not unique to Xabia, but I am not sure as to their function. Are they perhaps augmentations of honour?
Calp's arms are:
The castle which features in the arms is that built by the Moors. It was maintained after the Reconquista, but was apparently ineffectual against Moorish raids from North Africa. Wiki informs us that as late as 1687 the town was plundered by Barbary pirates. 290 townsfolk were captured and taken to Algeria, where they were imprisoned for 5 years, until their liberation in exchange for gold and the release of pirate prisoners. The motto, or rather augmentation of honour, "Muy Heroica Villa" is placed on an orle rather than the more usual bordure. I cannot (so far) discover why Calp was honoured in this way or when. It might have been in 1359 following a battle between King Pedro II of Aragon and King Pedro I of Castile.