2.5m? I doubt you'd hear any difference at all quite honestly. USB is designed to work up to 5m and then MAY require active repeaters to maintain a connection, but good quality line level RCA cables should be good for 5 to 10m. YMMV as usual.
Nottingham Analogue Spacedeck / Kuzma Stogi S / Benz Micro Ace S L
Lenco L-75 / Carl Ellis Plinth / Ortofon AS-212 / Ortofon SPU Classic GM E MkII
Ortofon ST-7 SUT / Nick G Modded Lentek Head Amp / Croft RIAA
Cambridge Audio CXU / Theta DS Pro Prime
Classé Model 30 / Luxman M-383
Usher Compass X-719
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