The rest of my system has a mix of RCA and XLR. I cannot say the XLR have any superior sound advantage over the RCA within this Kimber model.
If the equipment does not support the balanced standard, then variable results will be the case.
Switching from RCA to XLR is only worththe extra time and money is if, you have a True differential balanced from input to output for each channel . Which is easy to tell ,you will see 4 transformers .
We patented a method where this is not the case- using a direct-coupled output. This output circuit (modified Circlotron) is on the output of our tube preamps.
Lamm certainly does use XLRs at least they used to on their amps. My understanding is that the circuits were not truly balanced. Nonetheless, they probably met the criteria mentioned in this thread.They don't. Pin 3 is not connected, so if a true balanced source is connected to this input, a buzz will result since pin 2 will be floating with an incomplete circuit.
If you have consumer grade audio then balanced may not do much for you unless you have an EM/RF noise (reduced by 40 dB in extreme cases) problem.Our MP-1 is meant for home use but supports AES48. So there is some 'consumer grade' equipment that flies in the face of this.
If you have even noticed a difference between audio cables, you might want to read this. Its quick and no math:
http://www.atma-sphere.com/Resources/balanced.php