Better XLR/RCA adapters

I would use XLR cables and the current equipment is all RCA.

I guess you already know that a balanced cable won’t get you any performance improvement?

If it’s something you need to do temporarily, I’d try inexpensive adapters, like those sold by Lynx. You won’t notice the difference from the costly ones.

Remember, you’ll need different adapters at each end to match the differing genders of XLR used at the ends of a balanced cable.

Of course, temporarily. When you buy used sometimes you have to decide quickly if you know what you are looking for. Some cables are very difficult to find, so even if I will need it in a year I will get it now if I see it.

Why not use a good quality interconnect with RCA connectors on one end and XLR connectors on the other? Laspada Audio makes such cables available here https://www.ebay.com/itm/303822395905.

@inna 

mitch2, there are also Cardas adapters for $150 pair. Is there real difference?

I couldn't really say that it would be worth it particularly when you consider most equipment manufacturers, even those selling high dollar gear, use basic Neutrik XLR connectors and something similar to Cardas RCA connectors, although some do use more expensive connectors by WBT and others.  I would probably try to stick with adaptors that do not include a short cable component, just to keep things simple and to allow my main cables to be the primary conduit.  If I needed adaptors for a temporary situation, I would purchase one of the less expensive options from Parts Express.  If I needed them long-term, I would be very comfortable using Cardas adaptors, or the SMc Audio adaptors discussed by tvad, but I couldn't say for sure that I would hear a difference between those and the others.

I use these Sescom line level directional transformer convertors. About $40.00 each.  

   https://www.sescom.com/products/view/category/categoryslug/line-level-converters .