If I'm correct, it sounds like you are trying to use the pre-amp in the receiver to feed the power amp? If so, you need a regular IC from the pre -out jacks on the receiver to the input jacks on the amp.
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Sorry Rev, but you cannot hook those two units together. The Onyko NR515 does not have a set of pre-outs in order to use it strictly as a pre-pro. You are stuck with the Onkyo's internal amps. If it did have pre-outs, you would simply use RCA Audio Interconnects and would need 5 of them.
You will need an AVR that has pre-outs if you are intend on using the Emotiva in your system. These are usually the mid to high range models in manufacturers line-uos. Find the cheapest one you can that has a full set of pre-outs (not just subwoofer) that meets your decoding and room correction needs. Do not concern yourself about the AVR's power output - you won't need it. Good luck.
Looking at the rear of the Onkyo: http://www.jr.com/onkyo/pe/ONK_TXNR515/
It looks like you have a 'Pre Out Subwoofer' and a 'Line Out Zone 2' at the bottom, a little left of center.
Hook a set of interconnects with RCA ends from the 'Line Out Zone 2' into the power amp inputs. If that doesn't work, try the 'Pre Out Subwoofer'.
You should be cautious about connecting from the 'Line out' outputs directly to the power amp. Generally, a line out output means it is not controlled by the volume control on the receiver, meaning you'd be sending the full-volume signal to the power amp, something you probably don't want.
The 'Pre-out' connections, on the other hand, should send the signal through the volume control on the receiver.
It looks like to me your receiver (the Onkyo) doesn't have pre-outs for most of the channels. If your intent was to add more or better power to your various speakers, you probably can't do that with that receiver. In order to run to a power amplifier, the pre-amp or receiver needs to have "pre-outs" associated with the channels that you're trying to run to the power amp. Once you have the "pre-outs" on the receiver/pre-amp, you use RCA cables like has been previously mentioned.
Sorry the news is probably not in line with what you were hoping, but I think you might have a bit of a case of "You can't get there from here."
If I'm not using Line Outs, the only way left is to connect each speaker OUT on the receiver to the corresponding speaker IN on the amp via the screw down posts. The ones that have a hole in the post.
If that's true(?) I'd have to cut one end off the standard RCA jacks, bare the wire and stick the bare end through the posts on the receiver? Then plug the RCA ends into the amp?
Thanks to all for your help! rev
Revnice-Do not do what you just stated!
Looking at the Onkyo manual it appears that to use the Line Out of the receiver, your Emotiva amp would need a separate volume control. Like Sfar said you should be cautious of hooking up amps to Line Out outputs as they typically are not attenuated. Sadly I think your receiver will not allow you to control a separate amp without the amp having a volume control.
You can try hooking your amp up to the Line Out with volume all the way down but you may end up damaging the amp or speakers.
This is such miserable news! I've waited months to have this stuff shipped down to Mexico via friends because other shipping methods aren't reliable.
It's going to be months to ship it back again and get the right thing. Maybe Amazon will still take it back...
Jlind325is Paraneer Lindstad - despite the grim news, you guys saved me from making a(nother) dumb move here - thanks a lot!
The first thing I couldn't understand when researching this was why no one seems to make a reasonably priced pre-amp ONLY. Manufacturers would be saving by not including amplification and customers could then afford to step to decent sound.
People on this forum said, 'Get any receiver and forget about the amplification included' but I guess they forgot to mention what a novice might not know.
Does anyone have a suggestion for the right thing to get, does anyone want this Onkyo - you know I haven't plugged it in!
Your welcome Rev. Yes, you are right about no reasonably priced pre-pros. When you think it about it, they are basically AVR's without internal amps. They should be cheaper, right. NOT! Kind of makes you wonder how much it actually costs the manufacturer to throw in built-in amps???
The talk on internet forums about any AVR will do is correct except for one key feature - any AVR with PRE-OUTS! About the cheapest current model I can think of is the Yamaha RXV 773. They go about $800 usd. You might want to try the used market. Just make sure it is a newer model that has HDMI and will decode the new lossless audio formats. Prior to these lossless formats, it seemed most AVR's, even the entry level models, had pre-outs. Now this feature seems to be found on the $800 models and up. Things change. Good luck with your problem.