Seeking recommendations for DAC to amplifier balanced XLR cable


The amplifier is Musical Fidelity M6si and the new DAC is RME ADI-2 DAC FS, both great devices. At first I connected them with AQ Colorado 1m RCA. I happen to believe, however, that balanced cabling, which is possible between these two devices, has theoretical advantages over single-ended. I ordered Sommer Epilogue XLR cable from Germany, plugged it in yesterday and compared... Unfortunately AQ Colorado beats the newcomer. I have 2 choices: stay with AQ Colorado RCA (since it already plays great) or look for a better XLR cable. Any advice here is welcome! 
ghjuvanni
@ghjuvanni,

I would recommend XLR’s from Audio Envy. You will find their cables deliver detail, transparency in spades. Ultra quiet and smooth sound. They come with money back guarantee.

https://audioenvy.com/product/monitor/onestain-53/
@ghjuvanni  I've been using / exposed to their top two tiers over three generations (including the current one). You may be able to get a used top tier short length from 2 generations ago at your budgeted price...but I'm guessing here, and it may be unlikely for 500. I can't speak to their other tiers as I do not have direct experience.

There are a number of cable threads in the forum that should address your needs. I recommend perusing via the search function. It may lead to some good options and options different from those already brought up.

A number of regular posters use SR in their systems. Perhaps they will chime in.  @millercarbon  often recommends older SR cabling. It may be helpful to reach out to him.
David ten has given you good advice on breaking in the new cable before a rash decision. I will say I am a fan of Audioquest, Nordost and Kimber ( in that order )
but I think it is certainly taste and very system dependent. 
I would recommend at least a DBS cable which is a patented method to keep the dialectric formed and some silver in the cable per your stated interest in detail.

johnny R at stated above is an Audioquest expert.

have fun, enjoy the music and your quest

jim
Acoustic Zen looks interesting but $840.
FYI, there’s a 1.5m pair of AZ Silver Ref l XLR (list $1500) available at US Audio Mart for $495.  At that price you’re unlikely to lose much/any $ if they don’t work out.  If you’re not already aware of it, you should go to Hifishark.com as you can find products being sold on other sites in addition to what’s listed here so you’ll see more opportunities.  Just type the brand and/or product you’re looking for in the search bar in the upper right and you’ll see all current listings, and there’s a tab that shows past sales, which is helpful as you can see what the item has sold for in the past.  Best of luck. 

@soix I will go for AZ Silver Ref. I hope they are not an overkill for my RME / Musical Fidelity setup.