Here's an outline of the key differences: Marantz SR5013 over the Marantz SR6013 features. The SR5013 has 7.2 channels amplifier and the SR6013 9.2 channels. Both receivers have support for Dolby Atmos multichannel audio format. The surround sound technology DTS:X is supported by devices. We have evaluated both AV receivers, SR5013 has an overall score of 8.6 out of 10 vs 9.1 out of 10 for SR6013.