XLR to RCA Adapters

A bad idea. Balanced amps require an inverting and a non-inverting signal. I know trying to do that with an ARC amp results in half the amp output and higher distortion because you are only driving the amp with a non-inverting signal. The inverting side of the signal doesn't exist so that part of the circuit is not being driven. ARC did at one time make a powered device the took an RCA single ended input and gave you a real balanced output. You might want to consider something like that, or a good used balanced output preamp.

I apologize for hijacking the thread, but I have a question:
What if the scenario was just an opposite- balanced preamp and single-ended power amp?
Would the Jensen type converter still be the best solution?
I understand, that if I used simple XLR/RCA adapter, then I would only use "half" of the balanced preamp circuitry?

I had Rogue Magnum 99 preamp and BAT vk200 for a month or so, but soon I replaced Rogue with BAT vk30.
BAT/Rouge (with RCA-adapter) worked fine (an improvement over Linn/Rouge which I had for a couple of years), but I just could not get away with the idea that all balanced approach would be better.
I like vk30 over Rouge except the phono. The phono card from Rouge sound better for me than the vk phono card.
Later, I got an RCA-XLR cable (from AudioQuest) and it worked better than with the adapter.
Now I have vk200 and vk60 with vk30, biamping Tyler Linbrook signature systems.

"When one considers the noise cancellation properties of balanced, then you can easily see the reason for superior audio. Less noise equals better sound. "

I auditioned Joule-Electra LA-150Mk2, then I owned LA-300ME for an year and now I am blessed with LA-450ME. All these preamps have balanced amplification in the gain stage but (except 450) their inputs and outputs are single ended i.e. Joule-Electra split single ended on inout and add on output.

As much as I tried to hear any (AMY!) noise when I place my ear to the speakers I hear nothing, nada, ziltch, zero etc.

I cannot remove noise I do not hear !!!!! I am sure theere are other SE preamps without producing noise and one shoyld be careful what kind of IC he has

Most "audiophiles" love word "balanced" without realizing the immense difference between balanced input/output and balanced signal processing (amplification here) which cancel not so much noise as DISTORTIONS !!!!!!!! and this make immense difference in distortion-free music presentation.