FAQ What are the main input connections for the Classe Audio CA-301? The main input connections for the Classe Audio CA-301 are balanced XLR.Does the Classe Audio CA-301 have IR in and out capabilities? Yes, the Classe Audio CA-301 has IR in and out capabilities.What is the maximum voltage for the IR out on the Classe Audio CA-301? The maximum voltage for the IR out on the Classe Audio CA-301 is 5VDC.