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. 
jacquesbarteaux
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.
I am surprised no one else mentioned this, but not more than a few weeks ago, another guy asked about using a 22-foot phono cable.  You might search for that thread; all of the responses also apply to yours. Or was that you?
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.
@lewm seems like OP already installed it and ask for opinions.
@lewm The TT is being shipped over now. Along with a Pro-ject phono box II. I wanted something to ground the connection, and by suggestion of the chat here; give the signal a little boost to the receiver. I’ve had the cables sitting there for a while, but now that I can see the pre-amp will take off at least 3 feet, i’ll most likely get a shorter cable!