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Objective: The present investigation evaluated the speech perception performance of patients with ossified cochlea implanted with the 24M Double Array cochlear implant, using standard and duplicated maps in each of the arrays., Study Design: Retrospective case review., Setting: Tertiary referral center., Patients: Sixteen subjects received a Double Array cochlear implant. Among these, 9 fulfilled the following inclusion criteria: bilateral severe-to-profound postlingual deafness; bilateral obliterated cochlea, as shown by a computed tomographic scan; and a minimum age of 14 years to ensure reliable responses in the behavioral tests with the 3 tested maps., Intervention: Rehabilitative., Main Outcome Measures: The speech perception performance with the 2 arrays was compared with that with a basal array duplicated map and an apical array duplicated map. Three maps were fitted: the default map with both arrays activated, a double channel map using only the electrodes of the basal array, and a double channel map programmed only with the electrodes of the apical array. The test battery was composed of a vowel test, a 4-choice word test, and sentence recognition in quiet., Results: Statistical significance was reached in comparison the all tests in all programming conditions. Speech recognition in the standard map with both electrode arrays activated showed the highest scores., Conclusion: Performance with the 2 split electrode arrays was superior to those with the single arrays, regardless of the duplication of channels., ((C) 2013 Otology & Neurotology, Inc.)