The balanced output spec of 4.5 volts maximum most likely reflects the voltage DIFFERENCE between the inverted and non-inverted signals in the balanced signal pair. Each of those signals is probably no different in amplitude than the single-ended output, spec'd at 2.25 volts maximum.
If you are envisioning the possibility of using a simple mechanical XLR-to-RCA adapter you would be using only one of those 2.25 volt signals. And any such adapter will essentially negate the benefits that a balanced output may provide.
Also, most simple XLR-to-RCA adapters, while routing the non-inverted signal on XLR pin 2 to the RCA center conductor, short the inverted signal on XLR pin 3 to ground (pin 1). Some output stages have been known to be unhappy with that; see this thread for example. I understand, though, that Cardas adapters do not do that.
A better way of adapting XLR outputs to RCA inputs is with a Jensen transformer/audio isolator. See this paper. I wouldn't want to predict, though, whether or not investing in one of their devices (which generally cost a bit more than $200) would provide a benefit compared to your present single-ended connection.
If you are interested in pursuing their devices further, model PI-2XR, similar to PI-2XX shown near the bottom of this page except with RCA output connectors, would probably be a suitable choice. As indicated in its manual, it would be used with a very short RCA cable at its output, and an XLR cable at its input that is as long as necessary.
Regards,
-- Al
If you are envisioning the possibility of using a simple mechanical XLR-to-RCA adapter you would be using only one of those 2.25 volt signals. And any such adapter will essentially negate the benefits that a balanced output may provide.
Also, most simple XLR-to-RCA adapters, while routing the non-inverted signal on XLR pin 2 to the RCA center conductor, short the inverted signal on XLR pin 3 to ground (pin 1). Some output stages have been known to be unhappy with that; see this thread for example. I understand, though, that Cardas adapters do not do that.
A better way of adapting XLR outputs to RCA inputs is with a Jensen transformer/audio isolator. See this paper. I wouldn't want to predict, though, whether or not investing in one of their devices (which generally cost a bit more than $200) would provide a benefit compared to your present single-ended connection.
If you are interested in pursuing their devices further, model PI-2XR, similar to PI-2XX shown near the bottom of this page except with RCA output connectors, would probably be a suitable choice. As indicated in its manual, it would be used with a very short RCA cable at its output, and an XLR cable at its input that is as long as necessary.
Regards,
-- Al