Anybody use a single ended component with one that is balanced?

@jji666

+1 Don’t add an adapter. If the amp is balanced it a;ready has one and is likely to be of higher quality. The manufacturer has a vested interest in making both inputs sound good.

Many people think XLR is better port. Do you think of Conrad Johnson pre and amp? They always use RCA port and so many people love this brand.

I might enter this brand some day if it works well with audio research power amplifier.

WORTH A TRY.

Sounds NOTICEABLY better between my Cary preamp and Pass amp.  I have compared the two options extensively and everything (sound stage, dynamics, transparency) sounds better.  

Return them if it doesn't work out.  

FYI here is my neutrik adapter using the XLR cable from preamp, in this case neutrik female to male RCA.  

In the OP's case he would use a female XLR to female RCA at the preamp.  

In Some preamplifier,the left RCA and right RCA is very near and with this adapter,there is no enough space to mount  it on.

My way is order a RCA to xla cable,I do not receive the cable yet,and will tell when I try.