Various experiments have dealt with the idea that voice quality could be influenced by the speaker's language. Most authors in this field have tried to objectivate voice quality by means of long term average spectra (LTAS). It has been shown [1] that their results - although apparently contradictory - reveal that part of the LTAS variability can be explained by language variations. Recently, a powerful method allowing an accurate evaluation of those effects has been developed [2] and applied to Dutch and French. The purpose of the present work is to replicate this study with a new pair of languages: Catalan and Spanish (Castilian). 10 bilingual speakers have produced, each, 4 readings of 2 (1 Castilian and 1 Catalan) balanced texts. A 400-line LTAS was computed for each utterance. The LTAS are compared by means of the SDDD dissimilarity index. The results confirm previous findings, i.e., the inter-language variability is greater than the intra-language variabilities.