Recommendations of Cables to a Sub.

I believe you are referring to a line-level connection to the sub, as the sub does not appear to have speaker-level inputs.

Assuming that your main speakers are passive (i.e., they don't include a built-in power amplifier), the technical characteristics and requirements of the interfaces to the main speakers and to the sub are totally different. Also, any effects of the cables to the sub on frequencies that are above the deep bass part of the spectrum would be irrelevant.

Therefore I see no reason to use the same cable brand for the two applications. I would suggest that you consider inexpensive but well-made cables from Mogami, Blue Jeans, Signal Cable, etc.

Regards,
-- Al

Thanks Al.
Yes, the connection from my amp to sub would be line level. There are a set of XLR preouts on the back of my amp. I need to use a pair of XLR cables from the amp and a pair of XLR to RCA adaptors for the sub side to keep the L and R channels consistent. There is only a sole XLR input on the back of the Paradigm so I am a bit wary of using a Y splitter.

Yes, summing the two XLR outputs together with an XLR y-adapter could cause problems, depending on the design of the amp. Using XLR to RCA adapters might also cause problems, though, especially if the adapters short XLR pin 3 (the inverted signal in the balanced signal pair) to ground (XLR pin 1 and the RCA ground sleeve). Many and probably most adapters do that, unfortunately. I believe that Cardas adapters are an exception, which leave pin 3 unconnected on XLR-female to RCA adapters (that would be used for XLR outputs; pin 3 SHOULD be shorted to ground on RCA to XLR-male adapters, that would be used for XLR inputs).

What model amp is it?

Regards,
-- Al

The amp is a Vitus RI-100.
It does not have a dedicated sub output.
But the 2 XLR preouts can be used into a subwoofer.
Both XLRs need to be used when I emailed Vitus recently.
Thanks.