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A study of the quality of automatic speech recognition in distributed system. Proceedings of IberSpeech 2014, 2014. pp. 119-128.In the study presented in this paper, we verified how the speech recognition quality in distributed systems depends on the client device. We confirmed a quality reduction on mobile devices when compared with the obtained quality from a simultaneously taken signal from a laptop computer which acts as reference. We analysed the performance of applying a gain modification to the signals and the performance of applying Maximum Likelihood Linear Regression speaker/device adaptation. We also analysed the performance of applying the gain modification before the speaker/device adaptation, and vice versa. Results allow to propose a practical solution to improve speech recognition quality in distributed systems.