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In the recordings using electromagnetic articulograph AG 501, sensors are glued to subject's articulators such as jaw, lips and tongue and both speech and articulatory movements are simultaneously recorded. In this work, we study the effect of the presence of the sensors on the quality of speech spoken by the subject. This is done by recording when a subject speaks a set of 19 VCV stimuli while sensors are attached to subject's articulators. For comparison we also record the same set of stimuli spoken by the same subject but with no sensors attached to subject's articulators. Both subjective and objective comparisons are made on the recorded stimuli in these two settings. Subjective evaluation is carried out using 16 evaluators. Listening experiments with recordings from five subjects show that the recordings with sensors attached are significantly different from those without sensors attached in terms of human recognition score as well as on a perceptual difference measure. This is also supported in the objective comparison which computes dissimilarity measure using the spectral shape information.