Interconnects under floor?


I’ve moved house and now I have an issue that I’m sure isn’t uncommon: in order to have my rack out of firing range of (one of) my speakers, I need to move it to a location in the room that doesn’t allow for me to run interconnects discretely. I’m currently running 12’ balanced ICs to monoblocks that are near the speakers and those are connected with shorter speaker cables. From all I’ve read, longer IC and shorter speaker cables is great but to move my rack to a hood location I’d have to get even longer ICs and run them across the living room and across a major walkway. I thought about running up a wall and across and back down, concealing the cables with some sort of conduit that matches the wall colors, but... has anyone ever run cables in to the wall, under the house through conduit from rack to amps? Is that ridiculous? I’d obviously try to run them nowhere near other electrical wiring.
au_lait
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In large TV or movie studios, theaters and concert halls, for recordings and live events, 300 foot long XLR cables are common.  Look for cables that a rated for in-wall or plenum use.
Long speaker Wires.

Then, if still needed, down, thru crawl space without conduit.

Over the years, many locations, I've had very long speaker wires successfully. I've drilled holes against the walls down to my crawl space in many locations, for cable tv, coax, ethernet, signal, speakers, sub, rear surround, outdoor speakers, shop speakers. All without conduit, never an issue. Make sure you don't have mice.

Test: start with inexpensive heavy gauge lamp cord (1 strand marked). After that, you will be pleasantly surprised, then, if you must, upgrade those speaker wires in the future.

Once I made 50' long pairs out of solid core strands from electrical supply house, twisted them, they sounded as good as prior and later cables.

It's by trying stuff that you learn many 'inadvisable' solutions work well.
I run my XLR's down to the basement and back up to the monoblocks.
I see no reason why it should be an issue. 
Bob