What About Loom Theory?

I think you misread it. It's not loom, but looney theory. It's basic premise is that if you do it once, do it multiple times in order to achieve greater synergy. It only applies to cables. For instance, if you have a power cable, then have your interconnects and and your speaker cables by the same manufacturer. I strongly caution you that this theory doesn't apply to any other components but cables. For instance, there's far more synergy to be gained by mixing and matching preamps to different manufacturers' power amps. Also, never have the same brand loudspeakers as you do power amps. It really is looney.

Assuming you are referring to use of cables and power cords from a single manufacturer, as Onhwy61 inferred, see this thread. The thread initially focused just on power cords, but eventually broadened in scope to address all cables.

As is usual in audio, there was no consensus.

Regards,
-- Al

"Loon Theory," yes. Self explanatory...

I'm not sure it's "loom theory" as much as "loom speculation" which hypothesizes that one can/will achieve better sound if all cables are from the same manufacturer.
I'm sure you can get great sound that way but I know from experience that it can also be achieved by mixing and matching brands. So where does that leave the "loom theory"? Pretty meaningless IMO. Probably not worth any more time than already expended here.