If you didn't encounter noise/hum problem with 15 ft cable, increase the high by using the tone control on the
Onkyo stereo
to compensate the high frequency loss.
15 foot RCA cables out of TT with no pre amp?
Im very limited with the space I have. This is kinda limiting me to keep the turntable on a 15’ cable. I’m using a Pro-ject Carbon Debut Evo with an Ortofon 2m blue to an Onkyo stereo with a phono input. Cables are midrange, nothing special but not total crap. Just wanted to get some opinions or suggestions on this. How bad the loss is gonna be if there is any.