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You could be losing quality on those 20 foot 1/8 inch cables. You can get away with cheap cables on a short length.
I have a couple 20 footers(generic brand from hardware store etc) for interconnecting some audio equipment and I think there is a quality loss. But it's not a big deal as the 20 foot interconnection is not for serious listening - just occasional monitoring.
I got a 20 foot 1/8 inch headphone extension cable and I definitely notice a quality loss from that - but that cable only cost $2, from one of those dollar stores! It looks reasonable quality with gold plated connectors but the wire must be the cheapest stuff they could get (5 cents a foot maybe).
As a test of those cables, see if you can somehow use them as a headphone extension, and then compare the sound without the exta cable.
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