How about keeping your existing cables, but get a couple of AudioQuest (or similar) RCA female/female connector and then get a couple more RCA interconnects at 10 feet or so. Then join them all together and you’ve got 25 feet. This gives you the flexibility if you ever need shorter ones again you can just take that apart and keep the interconnects for another purpose.
Need 25 foot interconnects
I just moved around my equipment so that the rack with the preamp and digital sources is on the left side of the room and the monoblock amps are just behind the left speaker on a short platform on the floor. I’m using a 15’ RCA interconnect right now, but want to move each monoblock to just behind each speaker — which means I need a longer cable. The monoblocks are unbalanced RCA input only but my preamp can do balanced XLR or unbalanced RCA out. Would a balanced XLR cable plus an XLR to RCA adapter work for this setup and be my best option? Or should I just get a Belden (or similar) 25’ unbalanced RCA interconnect? Or is there a better option?