What is better: longer Speaker Cables, Longer RCA cables or longer USB cables?

EDIT: Thanks Line Level Folks We have a decision. I went speaker Cable
Question for Line Level folks:

DEDIT#2: I bought a $3 Monoprice USB-A to USB-B 15ft 28/24AWG Gold Plated and it works flawlessly. 15ft is GTG.
Now I also have 2x50ft of speaker cable. Now I can place my components anywhere. Thx folks.

I have speakers, AMP, KEF KUBE EQ, Preamp, PC. For best sound in my room, I now have a crazy cable party train strung across furniture from PC to DAC/Preamp via 3foot USB, Preamp to KEF KUBE EQ 3 ft RCA, KEF KUBE to Amp with 3Ft RCA. and AMP to Speakers with 6ft of speaker cable 12 gauge .

I want to consolidate my components. Do I buy new equidistant speaker cables ~15Ft, do I buy a 15Ft USB cable, or do I buy a 12ft RCA cable from preamp to KEF KUBE EQ?

Which component will suffer less over the distance travelled? I'm thinking Speaker cable? Just Like to hear your thoughts. Which is best kept short and what can I get away with.
 
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Hah, I’m sure you’ll get votes in favor of every option.

I’ll start with recommendation against long RCA cables. They have, on average, 100 pF/m (3 Ft) capacitance. Average preamplifiers may have slight treble roll off with long RCA cables and tube preamplifiers would definitely suffer. Though, there are SS preamplifiers with very low output impedance that would be unaffected even with 5 – 7 m long RCA cables.

USB works perfect with 5 – 7 m long USB cables. Just don’t be tempted to purchase any ‘audiophile USB cable‘ of a Chinese origin. I did such mistake and bought 5 m long cable which indeed look high quality, OCC single crystal copper and whatnot: USB cables to be avoided

PC didn’t register that DAC is plugged in, probably high capacitance and fact that data wires are not twisted but straight. It’s made with usual Star-Quad cable that our Chinese friends are using for everything audio related, never mind the standards. Avoid anything similar if more than 1m length is required.
OTOH, DAC worked perfectly well with pure crap 5m USB extension cable + 2m original USB cable from DAC. You’ll may get some FUD stories about noise and ‘lost data' with long USB cables, but that is fiction.
 
Hah, I’m sure you’ll get votes in favor of every option.

I’ll start with recommendation against long RCA cables. They have, on average, 100 pF/m (3 Ft) capacitance. Average preamplifiers may have slight treble roll off with long RCA cables and tube preamplifiers would definitely suffer. Though, there are SS preamplifiers with very low output impedance that would be unaffected even with 5 – 7 m long RCA cables.

USB works perfect with 5 – 7 m long USB cables. Just don’t be tempted to purchase any ‘audiophile USB cable‘ of a Chinese origin. I did such mistake and bought 5 m long cable which indeed look high quality, OCC single crystal copper and whatnot: USB cables to be avoided

PC didn’t register that DAC is plugged in, probably high capacitance and fact that data wires are not twisted but straight. It’s made with usual Star-Quad cable that our Chinese friends are using for everything audio related, never mind the standards. Avoid anything similar if more than 1m length is required.
OTOH, DAC worked perfectly well with pure crap 5m USB extension cable + 2m original USB cable from DAC. You’ll may get some FUD stories about noise and ‘lost data' with long USB cables, but that is fiction.
Thank you. I'm getting favorables for USB and Speaker so RCA is out. USB as digital with "error correction" and polling to fix errors. I read 15ft,~5m, is the max on USB 2.0. The cheapest is a 15ft Monoprice USB cable at $3, 12 Gauge speaker cable is $30+ for 100ft. I guess I'll try USB and go from there.
 
Long speaker cables will have low but significant resistance, so will slightly alter sound because speakers are not flat impedance.

That said, it´s known and predictable so in general preferable to possible highs loss and hum pickup in weak signal audio cables and even worse, high frequency data transmission and timing problems present in Data cables (such as USB)

FWIW what Galu said using less words 😉
 
I did think of using two cheap DACs, with an optical splitter, so I could have a DAC for each channel, with a light dependant resistor volume control so there would be no RCA or speaker cable, just a monoblock, DAC and volume control under each speaker.
 
I'm leaning that way. I need to understand error correction in a USB connection etc but I feel the same way.
If the error correction in the system works (involves sending a packet again if corrupted) you won't hear any issues. If it doesn't, you get dropouts.
Error correction is just what it says - it corrects the error.
If it can't it goes into error concealment which can't be missed, the stuttering type of sound.
So as long as you don't hear stuttering or dropouts it's bit-perfect and no issues.
The analog cables always lower the sound quality, varying from very little to a lot.
It is best to concentrate on the best analog cables which includes the shortest ones.

Jan