I need advice on Dissimilar runs using XLR

So, you really have no experience. You are just parroting something you read online.

I have googled why smoking is good for you and discovered that doctors and religious people confirm smoking is good for your health. Also, that climate change is not real, despite the conclusion of dozens of peer reviewed scientific papers, dozens of statements issued by scores of scientific communities, as well as overwhelming heat waves and storms well far outside three standard deviations of normal. 
 

Maybe google is not always the right source for info, especially when you can research it yourself.

Really good podcast on 10 Audiophile Myths, Cable myth is at 1:14 mark. 

https://darko.audio/2023/10/podcast-10-hi-fi-myths-busted-w-peter-comeau/

No at @ghdprentice not at all go take a EE class, better yet Gene @ audioholics can help you a lot. Also give this podcast a listen, bebunks alot of this BS people subscribe to. 

https://darko.audio/2023/10/podcast-10-hi-fi-myths-busted-w-peter-comeau/

https://www.gcaudio.com/tips-tricks/cable-length-and-the-effects-on-sound-quality

https://forum.audiogon.com/discussions/do-speaker-wires-have-to-be-the-same-length-for-each-speaker

https://producerhive.com/ask-the-hive/does-audio-cable-length-matter/

The results are in.

I ran 1m Audioquest speaker cables from my solid state woofer amps. This necessitated one XLR from the crossover being 20' and the other 4'. I could not hear any differences between the L & R channel. I reversed the cables- no audible difference. I used some tracks that are very difficult on a woofer- Bozz Skaggs Because Of You. Nothing. Zero zip nada. Looks like Jeffery125 was right. 

I appreciate all the input here. I was probably OCD worried about it way too much. 

I also made a set of XLRs per the writeup Paul McGowan of PS audio

 https://www.psaudio.com/blogs/how-to/how-to-make-a-50-pair-of-high-end-xlr-cables?_pos=1&_sid=0ce5e90e7&_ss=r

I used the cables and ends he recommended and again was surprised that my Morrow Audio XLR interconnects sounded no different than McGowan's home brew cable formula applied between my Audio Research SP 15 and the ARC VT130 power amp. Just to make sure I used the "McGowan" cable on one channel and the Morrow on the other channel- then reversed them. No audible difference. I'm stunned that my $50 McGowan cable and my $500 Morrow 1m interconnects are indistinguishable. I suspect there is a LOT of BS in the cable seller's claims. If I had no budget I'd probably buy the $6,000 interconnects in the fancy wood box but since I'm not a Billionaire I'll be happy getting max value for my HiFi buck. 

@yesiam_a_pirate Wrote:

 I was probably OCD worried about it way too much. 

I agree!

Mike