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I need advice on Dissimilar runs using XLR

I have a tri-amped system where the 2 SS amps are very close to the speakers. I need to make 2 runs to the SS amps from the crossover. One run is 1m the other run is 6m. All my components are balanced XLR in/outs.

My questions are:

1) Will unequal lengths of XLR make a noticeable difference between the L and R channel? and;

2) I’d like to get the best value for the buck for proper interconnects, so what brand do you recommend and why?

3) What are the problems (if any) of using 2 different quality brands with identical metals. (I may buy single cables used)

Anybody can pop off $3000 for a set of nice cables, but I’m searching for value. I’m good with used.

ARC SP15, ARC VT130 amp, Morrow 4 interconnects, Bryston 7Bsst2 monoblocks (for the woofers) Bryston 10B X-over & Model T speakers. Sources vary- Rotel CD, HD with hi res rips, computer, retired the phono- deteriorating vinyl wore me out but I do have a unplayed Slim Whitman album in reserve :)

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yesiam_a_pirate OP
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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. 

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