The main issue is not only loss but noise you want to keep the connection to the turntable as short as you can due to these reasons try to arrange a way for that to occur so you do not develop noise or hum.
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.