They would be balanced inputs not outputs. I like balanced signals and use them when possible but I think the major advantage is lowering the noise floor. I don't feel there is a sound improvement unless of course you have very long interconnects. Of course any less noise is an improvement. Some companies now use balancing transformers instead of true differential circuitry. This is very much cheaper to do but I don't know how to implement it into an existing amp.
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I think the mod is worth being done; this allows running long balanced lines which results in improved noise rejection;this lowers the noise floor level to increase low level detail and allows the use of shorter speaker cables.Especially nice if using monoblock amplifiers as to be able to be placed closer to the speakers.
It really depends on the context since the advantages of adding balanced lines depend on how noisy the environment is and how long those lines are. I run 10M interconnects in Manhattan and there's no difference between SE and BAL. OTOH, adding another input stage to an amp will add to the amp's inherent noise level since no active stage is absolutely silent.
Adding XLR inputs pin-mapped to existing RCA connectors, adds absolutely nothing other than diversity of connectors. To enjoy the benefits of balanced cabling you would have to add internal coupling transformers or additional circuitry to split phase. Such additional components in signal path might sound better or worse, depending on implementation.
You can use input transformers external to the amp so that no modification to the amp is necessary. This will still provide common mode noise rejection (possibly better than an active design) at the amp. From Jensen the product would be PI-2XR Cost is ~$210. Tell them you don't need the terminal strip and I think you can save a few bucks.