XLR cables from preamp to powered bass amp in speaker? (Legacy Focus XD.)

XLRs are largely immune To cable effects compared to single ended RCAs.

Many like Canare adn Cardas, I use Mogami+Neutrik and roll my own.
WireWorld and BlueJeans are often mentioned. 

But there are a lot of people that really spend up,

If you make your own, then you have good options. I would likely go for BlueJean or the subwoofer XLRs. It is good to have things working even if you are going to start auditioning $$$ cables.,,as it is hard to compare things to nothing.

I imagine the comments/feedback will be all over the place. 

FCS… ^this^ reads like prophecy. 

@holmz  Thanks, and regarding my comment. You know what happens in cable question threads. They usually go south in a hurry. Since it is strictly dealing with Bass signals, I have no real experience, and especially with XLR. 

What about these as a start?

Though I’ve tried some, I have never found it necessary to use expensive XLR interconnects. They were no better than -- some worse than -- simple mic cables made with Mogami W2549 and Neutrik connectors.

The need for fancy wires would be even less for low frequencies of a subwoofer. If sound quality is the goal, I would also second Blue Jeans or Mogami cables or cables made with good Mogami mic cabling.

I use a 15-foot length of the below cable for my preamp to amp. Both of those are not particularly fussy about XLR. I need to buy a 25-foot length for my second system which will use the same preamp. Good cables and cheap.

Benchmark Studio&Stage™ StarQuad XLR Cable for Analog Audio - Benchmark Media Systems

Yeah, Benchmark is not about to sell junk.

You know what happens in cable question threads. They usually go south in a hurry

^correct… south and down… descending into the depths of hell.

I use the Mogami star quad like @yyzsantabarbara and Benchmark, but as I am cheap and I like the length exact… I just build them as I need them.

For a sub (bass) I would not expect anything untoward to be happening. Even for the full range I would not.