Rel sub cable options

I just had audioArtcable make me a pair for my T-3s,I was blown away by the increase in low bass power and dynamics.I upgraded to the SC-5SE on Robs advice and I have no regrets.

Everest, I don't know what cable you are supplying your customers, BUT the cable that came with my REL was not terminated at the amp end. I added spades as an upgrade.

Daveyf, I was comparing the GutWire cable versus the upgraded REL Bassline Blue which comes with spades. The REL cable that is included with REL subs provides bare wire on the amp end.

I've been using a Rel Stadium 2 for over 10 years and just added another one (big improvement with room node reduction and increased smoothness overall) but I called Frank at Signal Cable, told him the length(s) I needed and he made me custom lengths to replace the stock Rel cables.
*Dramatic difference? No.
*Well worthwhile in extra dynamics,speed and detail: yes.
Am not familiar with the brands/models you've mentioned so I can't compare but changing from the stock cable seems a likely improvement... FWIW, I will never use stock power cords nor will I buy any component with captive power cords unless I swap in an IEC connector to allow aftermarket cables as the improvements are profound; but that's a whole other can of worms not worth opening. Good luck.

I love Neutrik connectors (years in pro audio) and find it's really simple to build
cables using these things. Get a shrink wrap setup (for the amp end) and off you
go...I replaced my REL cable with some well designed cable (Canare...made from
ground up small birds) I bought someplace and although it's not solid core like
most of my other hifi stuff, it sounds great. The REL was working fine prior to my
"new" cable, but since it's a sub these things are harder to quantify...I
will say the "speed," accuracy, tonal balance, odor, power, subtlety of
nuanced dynamic variables, increase in variability of non variable variables, and
dust rejection of the open weave speaker grill have all improved by exactly (I
measured this with an Exactness Measuring Device) 4.3%. Totally worth it.